Publications

Journals:

YEAR 2002

1. B. N. Upadhyaya, P. Mishra, K. Ranganathan, S. C. Vishwakarma, H. N. Golghate, A. Choubey, N. Muthukumaran, R. K. Jain, G. Mundra and T. P. S. Nathan,
   "Beam Quality Considerations of high Power Nd:YAG Lasers",
   Journal of Optics and Laser Technology, Vol.34 (2002), pp.193-197


2. Sanjay Kher, G Srikanth, Smita Chaube, Arup lal Chakraborty, T. P. S Nathan and D. D. Bhawalkar,
   "Design, development and studies on Raman-based fibre-optic distributed temperature sensor",
   Current Science. 83(11), pp 1365-1367,10 Dec. 2002.
   

YEAR 2003

1. R. Sundar, B. N. Upadhyaya, M. B. Alsous, K. Ranganathan, T. P. S. Nathan,
   "A Novel Technique to Generate Orthogonal Polarizations in Q-Switched Solid-State Lasers",
   Optics Communications Vol.223 (2003), pp.157-162.
   


2. G. Srikanth, T. P. S Nathan,
   "Ceramic Reflectors for Solid State Lasers",
   Journal of Optics.32 (2), pp 75-77, April-June 2003.
   

YEAR 2004

1. Sanjay Kher, Shrikant Gurram, Manoj Kumar Saxena, T. P. S Nathan,
   "Development of distributed fibre optic temperature sensor with sub-metre resolution",
   Current Science.86 (9), pp 1202-1204, 10 May 2004.
   

YEAR 2007

1. G. Srikanth,
   "Measurement of period of interference patterns with sub-micron period",
   Journal of Optics and Laser Technology, Vol. 39, No.5 pp 918-921, July, 2007
   


2. Srikanth Gurram and Ashish Kumar Nath,
   "Analysis of tuning of Bragg wavelength of photo-written fiber Bragg gratings during inscription process using a biprism",
   Applied Optics, Vol. 46, No.12, pp 2197-2204, 20 April, 2007.
   


3. Om Prakash, Ramakanta Mahakud, Ramakanta Biswal, Shrikanth Gurram, Harilal Vora, and Sudhir Dixit,
   "A study on the quality of interference fringes from a pulsed UV source for application in a Bi-prism based Fiber Bragg Grating writing",
   Applied Optics, Vol.46, No.24, pp 6210-6217,20 August 2007.
   


4. B.N. Upadhyaya, Usha Chakravarty, A. Kuruvilla, K. Thyagarajan, M.R. Shenoy, and S. M. Oak,
   "Mechanisms of generation of multi-peak and mode-locked resembling pulses in Q-switched Yb-doped fiber lasers",
    Optics Express, Vol.15, No.18, 11576-11588 (2007)
   

YEAR 2008

1. B.N. Upadhyaya, S.C. Vishwakarma, A. Choubey, R.K. Jain, Sabir Ali, D.K. Agrawal, A.K. Nath,
   "A highly efficient 5 kW peak power Nd:YAG laser with time-shared fiber optic beam delivery",
   Optics and Laser Technology, Vol. 40, No.2, 337-342 (2008)
   


2. B.N. Upadhyaya, Usha Chakravarty, A. Kuruvilla, M. R. Shenoy, K. Thyagarajan and A. K. Nath,
   "Effect of steady-state conditions on self-pulsing characteristics of Yb-doped cw fiber lasers",
   Opt. Commun., Vol. 281, 146-153 (2008)
   


3. G Srikanth, "Analysis of effect of divergence of laser beam on prism-based inscription of fiber Bragg gratings over a wide wavelength range", Applied Optics, Vol. 47, No. 17, pp 3092-3098, 10 June 2008.
   


4. G. Srikanth, A. K. Nath,
   " Laser wavelength considerations for inscription of Fiber Bragg Gratings: specific to applications in fiber lasers and amplifiers",
   Journal of Optoelectronics and Advanced Materials Vol. 10, No. 2, , p. 413 – 421, February 2008
   

YEAR 2010

1. "Development of underwater laser cutting technique for steel and zircaloy for nuclear applications", 
   R. K. Jain, D. K. Agrawal, S. C. Vishwakarma, A. K. Choubey, B. N. Upadhyayaand S. M. Oak,
   PRAMANA-Journal of Physics, 75 1253 (2010).
   
   
2. "Self-pulsing characteristics of a high-power single transverse mode Yb-doped  CW fiber laser",
   B. N. Upadhyaya, Usha Chakravarty, A. Kuruvilla, S. M. Oak, M.R. Shenoy, K. Thyagarajan,
   Optics Commun. 283, 2206 (2010).
   
   
3. "Effect of laser linewidth and fiber length on self-pulsing dynamics and output stabilization of single-mode Yb-doped double-clad fiber laser",
   B. N. Upadhyaya, Antony Kuruvilla, Usha Chakravarty, Mangalpady R. Shenoy, Krishna Thyagarajan and Shrikant M. Oak,
   Appl. Opt. 49, 2316 (2010).
   
   
4. "Study of the fabrication parameters of large core Yb2O3 doped optical fiber through solution doping technique",
    M. C. Paul, B. N. Upadhyaya, S. Das, A. Dhar, M. Pal, S. Kher, K. Dasgupta, S. K. Bhadra, R. Sen,
   Opt. Commun.283, 1039 (2010).
   
   
5. "Realization and analysis of a 150-W peak-power single transverse mode passively Q-switched Yb-doped double-clad fiber laser",
   B. N. Upadhyaya, A. Kuruvilla, U. Chakravarty, S. M. Oak, M. R. Shenoy and K. Thyagarajan,
   Proc. SPIE 8173, 81730Z (2010).
   
   
6. "Investigation on thermal effects in high power Yb-doped fiber laser",
   Usha Chakravarty, B. N. Upadhyaya, A. Kuruvilla and S. M. Oak,
   Proc. SPIE 8173, 817310 (2010).

YEAR 2011

1. "Analysis of Output Pulse Characteristics in Q-Switched Yb-Doped Fiber Laser",
   Brahma N. Upadhyaya, Arun Kumar, Usha Chakravarty, Shrikant M. Oak, Mangalpady R. Shenoy, and Krishna Thyagarajan,
   IEEE J. Quantum Electron., 47, 786 (2011).

YEAR 2012

1. "Microstructural characterization of plasma sprayed Al2O3-40 wt.% TiO2 coatings on high density graphite with different post-treatments",
   Jagadeesh Sure, A. Ravi Shankar, B. N. Upadhyay, U. Kamachi Mudali,
   J. Surface & Coatings Technology, 206(23), 4741 (2012).

YEAR 2013

1. "Efficient depolarization loss compensation of solid state lasers using only a Glan-Taylor polarizer",
   S. Mondal, S. P. Singh, K. Hussain, A. Choubey, B. N. Upadhyay, P. K. Datta,
   J. Opt. & Laser Technol. 45, 154 (2013).

Conferences:

YEAR 1991

1. D. K. Kohli, Y. V. S. T. Sai, S. Ali, T. P. S. Nathan,
   "Development of thermopile detector for CW CO2 lasers",
   National Symposium on Instrumentation (NSI-16) , Cochin University of Science & Tecnology, Cochin, Nov. 24-27, 1991.

YEAR 1997

1. D.K. Kohli, V.P. Bhanage, V. Kumar, D. K. Agrawal., T.P.S. Nathan, A.G. Bhujle,
   "Hand Held Laser Power Meter",
   National Laser Symposium - 1997 (NLS-97) , PRL, Ahmedabad, Dec. 10-12, 1997.
   


2. D. K. Kohli, S. Ali, T. P. S. Nathan,
   "Flexible Hollow Fiber for the Surgical CO2 laser",
   National Laser Symposium - 1996 (NLS-96), CAT, Indore, Feb., 6-8, 1997.
   

YEAR 1998

1. P. Roy Chaudhuri, B. N. Upadhyaya, M. R. Shenoy and B. P. Pal,
   "Fused fiber wavelength division multiplexing couplers: Fabrication and Characterization",
   National Symposium on Advances in Microwaves and Lightwaves, University of Delhi, New Delhi, March 2-4, 1998.
   

YEAR 2000

1. P. K. Mukhopadhyay, J. George, S. K. Sharma, B. N. Upadhyaya, T. P. S. Nathan,
   "Performance characterization of acousto-optically Q-switched Nd:YVO4 micro laser",
   National Laser Symposium - 2000 (NLS-2000) , LASTEC, Delhi, Dec., 13-15, 2000, p. 43-44.
   


2. D. K Kohli, P.K Mukhopadhyay, J., George, V.P. Bhanage, D.K., Agrawal, A.G. Bhujle, T.P. S. Nathan,
   "Sensor Characterization of 1W hand held laser power meter",
   National Laser Symposium - 2000 (NLS-2000) , LASTEC, Delhi, Dec., 13-15, 2000, p. 270.
   

YEAR 2001

1. B. N. Upadhyaya, P. Mishra, K. Ranganathan, S. C. Vishwakarma, H. N. Golghate, A. Choubey, N. Muthukumaran, R.K. Jain, G. Mundra, T.P.S. Nathan,
   "Beam Quality Considerations of High Power Nd:YAG Lasers",
   National Laser Symposium-2001, CAT Indore, Dec. 19-21, 2001.
   


2. D. K. Agrawal, Sabir Ali, D. K. Kohli, R. K. Khare and T. P. S.Nathan,
   "Thin foil sensor laser power meter for 1mW-10Watt power range",
   National Laser Symposium-2001, CAT Indore, Dec. 19-21, 2001.
   

YEAR 2002

1. G. Mundra, K. Ranganathan, M.R. Jathar, R.K. Jain, B.N. Upadhyaya, S.C. Vishwakarma, K.M. Khare, P. Mishra, T.P.S. Nathan,
   "Orbital Laser Machine for Reactivity Flow-tube Cutting",
   Power Beams and Material Processing 2002, DAE-BRNS Symposium on applications of Plasma, Laser & Electron Beams, BARC, Mumbai
   


2. G. Mundra, B.N. Upadhyaya, R.K. Jain, T.P.S. Nathan,
   "Hand-Operated Laser Manipulator for Coolant Channel to Feeder Coupling bolts cutting(for PHWR)",
   National Laser Symposium-2002
   


3. G. Mundra, B.N. Upadhyaya, R.K. Jain, A. Choubey, P. Mishra, S.C. Vishwakarma, V. Bhavasar, K. Ranganathan, R. Arya, T.P.S. Nathan,
   "Irradiation Capsule Laser Welding Machine",
   National Laser Symposium-2002
   


4. G. Srikanth, TPS Nathan,
   "Ceramic reflectors for solid State lasers",
   Proc. of DAE-BRNS National Laser symposium, SCTIMST, Tiruavananthapuram, Nov.11-14, 2002.
   


5. Smita Chaubey, G Srikant, AL Chkraborty, S Kher, TPS Nathan,
   "Investigation of Raman OTDR concept for multipoint temperature measurement",
   Proc. of DAE-BRNS National Laser symposium, SCTIMST, Tiruavananthapuram, Nov.11-14, 2002
   


6. Sanjay Kher, Smita Chaubey, G Srikant, T.P.S.Nathan,
   "Spontaneous Raman Scattering in Optical Fibers for Distributed Temperature Sensors",
   Sixth International conference on Optoelectronics, Fiber Optics and Photonics, Photonics-2002, BARC, Mumbai, India, 2002
   


7. R. Sundar, B. N. Upadhyaya, K. Ranganathan, T. P. S. Nathan,
   "Measurement of Laser Head Parameters by Time-delay Analysis",
   Proc. of DAE-BRNS National Laser symposium, SCTIMST, Tiruavananthapuram, Nov.11-14, 2002
   


8. B. N. Upadhyaya, P. Mishra, K.Ranganathan, S. C. Vishwakarma, Amber Choubey, T. P. S. Nathan,
   "Power Scaling of High Power Nd:YAG Lasers with Dual-Cavity Resonator",
   Proc. of DAE-BRNS National Laser symposium, SCTIMST, Tiruavananthapuram, Nov.11-14, 2002
   


9. K. Ranganathan, V. Bhawasar, B. N. Upadhyaya, P. Mishra, S. C. Vishwakarma, N. Muthukumaran, T.P.S. Nathan,
   "Development of Multirod CW Nd:YAG Laser",
   Proc. of DAE-BRNS National Laser symposium, SCTIMST, Tiruavananthapuram, Nov.11-14, 2002
   


10. S. Satapathy, B. N. Upadhyaya, V.K. Wadhavan,
    "Design, Fabrication and Testing of an Energy Meter based on pyroelectric effect in TGS crystal",
    National Conference on Sensor Technology(NCST-Sept.2002) Organized by CEES, DRDO and Ministry of Defence in Delhi (Best Poster Award)
    

YEAR 2003

1. G. Mundra, Ambar Choubey, M.R.Jathar, Rajesh Arya, S.C.Vishwakarma &  T.P.S.Nathan,
   "Design of 4 –axes laser welding workstation (machine) for Cardiac Pacemaker",
   National Welding Seminar-2003 (KCP Award for the Best Paper on Fabrication in Welding)
   


2. G. Mundra, A. Choubey, R. K. Jain, S. C. Vishwakarma, K. Rangnathan, T.P.S. Nathan,
   "Tube mountable Orbital Laser Cutting Machine (For neck cutting of Hair pin type heat exchanger of a Nuclear Power Plant)",
   National Symposium on Instrumentataion-2003
   


3. G. Mundra, B. N. Upadhyaya, S.C. Vishwakarma, Amber Chaubey, R.K. Jain, K. Ranganathan, Jojo Joseph, K.V. Kashivishwanathan, T.P.S. Nathan,
   "Development of Laser Cutting system for dismantling of FBTR Spent Fuel Assembly",
   INSAC 2003
   

YEAR 2005

1. B.N. Upadhyaya, S.C. Vishwakarma, R.K. Jain, Ambar Choubey, Pankaj Gupta, S.K. Chadda, T.P.S. Nathan,
   "Development of In-situ Laser Cutting Technique for Coolant Channels in Pressurised Heavy Water Reactors",
   DAE-BRNS National Laser Symposium-2005, Vellore
   


2. Ambar Choubey, B.N. Upadhyaya, S.C. Vishwakarma, Sabir ali, T.P.S. Nathan,
   "Resonator Design for High Energy Pulsed Solid State Lasers",
   DAE-BRNS National Laser Symposium-2005, Vellore
   


3. Om Prakash, R Mahakud, G Shrikanth, MP Surjith, SK Dixit, U Naundy,
   "Fiber Bragg Grating writing at C-band using 255nm radiation generated from the second harmonic of Copper Vapor laser",
   Proc. of DAE-BRNS National Laser symposium, VIT, Vellore, Dec.7-10, 2005
   


4. B. N. Upadhyaya, S. C. Vishwakarma, A. Choubey, P. Misra, R. K. Jain, Sabir Ali, D. K. Agrawal, R. Arya and T.P.S. Nathan,
   "Development of an Efficient 5kW Peak Power Nd:YAG Laser with Time-shared Fiber Optic Beam Delivery",
   International Conference on Optics and Optoelectronics (ICOL-2005), IRDE, Dehradun, PP-LA-16
   


5. B.N. Upadhyaya, A. Kuruvilla, S. Kher, M.R. Shenoy, K. Thyagarajan and T.P.S. Nathan,
   "Development and Analysis of a Highly Efficient 10W Single Mode Yb-doped CW Fiber Laser",
   International Conference on Optics and Optoelectronics (ICOL-2005), IRDE, Dehradun, OP-LA-7
   


6. Srikanth Gurram, TPS Nathan,
   "Imaging and recording of sub-micron period interference pattern: Theory, analysis and experiments",
   Abstracts of International Conference on Optics and Optoelectronics, ICOL-2005, IRDE, Dehradun, India, December 12-15, 2005
   


7. G Srikanth, Om Prakash, SK Dixit,
   "Use of bi-prism for inscription of Fiber Bragg Gratings",
   Proc. of DAE-BRNS National Laser symposium, VIT, Vellore, Dec.7-10, 2005
   


8. S.C. Vishwakarma, R.K. Jain, B.N. Upadhyaya, Ambar Choubey, D.K. Agrawal, Pankaj Gupta, S.K. Chadda, T.P.S. Nathan,
   "Development of Laser based System for Cutting of Bellow lip during En-masse Coolant Channel Replacement in PHWR type of Nuclear Reactors",
   DAE-BRNS National Laser Symposium-2005, Vellore (ILA Best Poster Award )
   


9. B.N. Upadhyaya, S. Kher, M.R. Shenoy, K. Thyagarajan, T.P.S. Nathan,
   "Investigations on Yb-doped CW Fiber lasers",
   International Conference on Optoelectronics, Fiber optics and Photonics, Cochin, FBR 2.4, PHOTONICS 2004
   


10. G. Mundra, B.N. Upadhyaya, R.K. Jain, Amber Choubey, S.C. Vishwakarma, T.P.S. Nathan,
    "Laser Based Cutting Tool for Steam Generator Tubes in PHWR",
    DAE-BRNS National Laser symposium-04, BARC, Mumbai, Jan.10-13, 2005
    


11. S. Chaubey, G Srikanth, S. Kher, T.P.S.Nathan,
    "Fabrication of long period grating using CO2 laser and its characterization",
    Proc. of DAE-BRNS National Laser symposium-04, BARC, Mumbai, Jan.10-13, 2005
    


12. B.N. Upadhyaya, S.C. Vishwakarma, P. Gaure, R.K. Jain, Amber Choubey, G. Mundra, Pankaj Gupta, S.K. Chadda  and T.P.S. Nathan,
    "Development of Laser based Cutting Machine for Easy Storage of Irradiated PHWR Pressure Tubes",
    DAE-BRNS National Laser symposium-04, BARC, Mumbai, Jan.10-13, 2005
    


13. Amber Choubey, S.K. Sah, S.C. Vishwakarma, D.K. Agrawal, B.N. Upadhyaya,  T.P.S. Nathan,
    "Development of High Energy Short Pulse Nd:YAG Laser for Measurment of Thermal Diffusivity of Materials",
    DAE-BRNS National Laser symposium-04, BARC, Mumbai, Jan.10-13, 2005
    

YEAR 2006

1. B.N. Upadhyaya, Usha Chaturvedi, A. Kuruvilla, M.R. Shenoy, K. Thyagarajan, A.K. Nath,
   "Development and Simulation of a Kilowatt Level Peak Power Q-switched Yb-doped Fiber Laser",
   Eighth International conference on Optoelectronics, Fiber Optics and Photonics, Photonics-2006, Hyderabad, India, Dec 13-16, 2006
   


2. G.Srikanth and A.K.Nath
   "Inscription of fiber Bragg grating arrays in fibers for distributed fiber optic sensors using a biprism: Analysis",
   Eighth International conference on Optoelectronics, Fiber Optics and Photonics, Photonics-2006, Hyderabad, India, Dec 13-16, 2006
   


3. R. Mahakud, O. Prakash, S.K. Dixit, S.Gurram, H.S. Vora, U. Nundy,  
   "Studies on the interference fringe stability formed by a bi-prism and UV beams of varying spatial coherence width generated from SHG of CVL radiations",
   Proc. of sixth DAE-BRNS National Laser symposium, RRCAT, Indore, Dec.05-08, 2006
   


4. B. N. Upadhyaya, Usha Chaturvedi, Antony Kuruvilla, A. K. Nath,
   "Realization of a 2.5 Watt Diffraction-limited Narrow Line-width All-fiber Yb-doped CW Fiber Laser",
   NLS-2006, RRCAT, Indore
   


5. S.C. Vishwakarma, B.N. Upadhyaya, S.K. Sah, Ambar Choubey, D. K. Agrawal, R.K. Jain, A. K. Nath,
   "Development of an Electronically Controlled Fiber-optic Port Selection Technique for High Power Solid-State Lasers",
   NLS-06, RRCAT, Indore
   


6. Ambar  Choubey, D.K. Agrawal, Ashish Tiwari, S.C. Vishwakarma, R.K. Jai, B.N. Upadhyaya, A.K. Nath,
   "Laser Based Cutting of Inclined Slots in Copper for Microwave Antenna and Coupler Applications",
   NLS-06, RRCAT, Indore
   


7. Ambar Choubey, B.N. Upadhyaya S.C. Vishwakarma, D.K. Agrawal, Sabir Ali, R.K. Jain, A.K. Nath,
   "Real-Time Focus Control in Material Processing with Fiber Coupled Solid-state Lasers",
   NLS-06, RRCAT, Indore
   


8. B.N. Upadhyaya, S.C. Vishwakarma, R. K. Jain, Ambar Choubey, S.K. Sah, D.K. Agrawal, Sabir  Ali,  A.K. Nath,
   "Development of In-situ Laser Cutting Technique for High Pressure Feeder Coupling Studs in Pressurized Heavy Water Reactors",
   NLS-06, RRCAT, Indore
   

YEAR 2007

1. B. N. Upadhyaya, S. C. Vishwakarma, Sabir Ali, V. Bhawsar, S. K. Sah, R. Arya, D. K. Agrawal, R. K. Jain, A. Choubey, S. M. Oak,
   "Development of an Efficient 880 W CW Nd:YAG Laser",
   DAE-BRNS National Laser Symposium 2007, MSU, Vadodara
   


2. S. C. Vishwakarma, R. K. Jain, B. N. Upadhyaya, Ambar Choubey, D. K. Agrawal, S. M. Oak,
   "Development of In-situ Laser based Cutting Technique for Shock Absorber Rear Nut in Pressurized Heavy Water Reactors",
   DAE-BRNS National Laser Symposium 2007, MSU, Vadodara
   


3. Usha Chakravarty, B. N. Upadhyaya, Antony Kuruvilla, S. M. Oak,
   "A high-power superfluorescent fiber source using Yb-doped double-clad fiber".
   DAE-BRNS National Laser Symposium 2007, MSU, Vadodara
   


4. Arun Kumar, B. N. Upadhyaya, S. M. Oak,
   "Real Time Analysis of Laser Weld Pool Characteristics",
   DAE-BRNS National Laser Symposium 2007, MSU, Vadodara
   


5. Ambar Choubey, D. K. Agrawal, S. C. Vishwakarma, B. N. Upadhyaya, Sabi Ali, R. K. Jain, S. K. Sah, R. arya, Jojo Joseph, K. V. Kashivishwanathan, S. M. Oak,
   "Laser cutting of Fast Breeder Test Reactor fuel subassembly in hot cell".
   DAE-BRNS National Laser Symposium 2007, MSU, Vadodara
   


6. Ambar Choubey, R. K. Jain, D. K. Agrawal, S. C. Vishwakarma, B. N. Upadhyaya, S. M. Oak,
   "Effect of pulse duration and spot overlap on laser cleaning with Nd:YAG laser",
   DAE-BRNS National Laser Symposium 2007, MSU, Vadodara
   

YEAR 2008

1. B. N. Upadhyaya, Usha Chakravarty, A. Kuruvilla, S. M. Oak, M.R. Shenoy and K. Thyagarajan
   "Analysis and realization of a 4 W linearly polarized single-mode Yb-doped CW fiber laser",
   International conference on fiber optics & photonics, PHOTONICS-2008, 13-17 Dec. 2008, New Delhi
   

YEAR 2009

1. B. N. Upadhyaya, Antony Kuruvilla, R. K. Jain, Usha Chakravarty, S. M. Oak, M. R. Shenoy, K. Thyagarajan,
   "Development and analysis of an efficient 40 W CW single transverse mode Yb-doped fiber laser",
   DAE-BRNS National Laser Symposium (NLS-09), BARC, Mumbai.
   


2. Ambar Choubey, S. C. Vishwakarma, B. N. Upadhyaya, R. Arya, R. K. Jain, Sabir Ali,D. K. Agrawal, S. M. Oak,
   "Development of 500W average power fiber coupled pulsed Nd: YAG Laser",
   DAE-BRNS National Laser Symposium (NLS-09), BARC, Mumbai.
   


3. R. K. Jain, D. K. Agrawal, Ambar Choubey, S. C. Vishwakarma, B. N. Upadhyaya, S. M. Oak,
   "Development of underwater laser cutting technique for steel and zircaloy for nuclear applications",
   DAE-BRNS National Laser Symposium (NLS-09), BARC, Mumbai.
   


4. A. Choubey, S. K. Sah, R. Arya, Jai Kishore, C. B. Panwar, B. N. Upadhyaya, S. M. Oak,
   "Development of an efficient diffusion-cooled CW CO2 laser for non-contact heating applications",
   DAE-BRNS National Laser Symposium (NLS-09), BARC, Mumbai.
   


5. Arun Kumar, B. N. Upadhyaya, S. M. Oak,
   "Development of fused fiber coupler workstation",
   DAE-BRNS National Laser Symposium (NLS-09), BARC, Mumbai.
   


6. B. N. Upadhyaya, M. K. Mishra, S. C. Vishwakarma,R. K. Jain, A. Choubey, D. K. Agrawal, D. N. Badodkar, ManjitSingh, K.V.S. Sastry, B. N. Patil, S.M.Oak,
   "Laser micro-welding of Brachytherapy assembly having high dose rate source"
   DAE-BRNS National Laser Symposium (NLS-08), 7-10 Jan. 2009, LASTEC, New Delhi. (ILA Best Poster Award).
   


7. Ambar Choubey, S. C. Vishwakarma, B. N. Upadhyaya, R. K. Jain,D. K. Agrawal, Sabir Ali, S.      M. Oak,
   "Performance study of ceramic Nd: YAG rod for long pulse laser operation".
   DAE-BRNS National Laser Symposium (NLS-08), 7-10 Jan. 2009, LASTEC, New Delhi
   


8. Arun Kumar, Amber Choubey, B. N.Upadhayaya, S. M. Oak ,
   "Effect of temporal shape of Nd:YAG laser pulse on weld geometry"  
   DAE-BRNS National Laser Symposium (NLS-08), 7-10 Jan. 2009, LASTEC, New Delhi.
   


9. Usha Chakravarty,  B. N. Upadhyaya,  Antony Kuruvilla,  S.M.Oak,
   "Effect of pump wavelength and fiber length on superfluorescent generation from single- mode Yb-doped double clad fiber",
   DAE-BRNS National Laser Symposium (NLS-08), 7-10 Jan. 2009, LASTEC, New Delhi.
   


10. Arun Kumar, B. N. Upadhyaya, S. M. Oak,
    "Analysis of hardness behaviour in laser weld pool",
    DAE-BRNS National Laser Symposium (NLS-08), 7-10 Jan. 2009, LASTEC, New Delhi.
    

YEAR 2010

1. "Realization and analysis of a 150 W peak power single-transverse mode passively Q-switched Yb-doped double-clad fiber laser",
   B. N. Upadhyaya, A. Kuruvilla, U. Chakravarty, S.M. Oak, M. R. Shenoy*, and K. Thyagarajan,
   Proceedings of International Conference on Fiber Optics and Photonics (PHOTONICS 2010) IIT Guwahati, India (2010).



2. "Investigation on thermal effects in high power Yb-doped fiber laser",
   Usha Chakravarty, B. N. Upadhyaya, A. Kuruvilla, S. M. Oak,
   Proceedings of International Conference on Fiber Optics and Photonics (PHOTONICS 2010) IIT Guwahati, India (2010).



3. "A 9.6 W Yb-doped CW fiber laser using Photonic Crystal Fiber",
   Bani Malhotra*, Prateek Thapliyal*, Harneet.V. Thakur*, R. B. Sharma*, U. Chakravarty, B. N. Upadhyaya, S. M. Oak,
   Proceedings of International Conference on Fiber Optics and Photonics (PHOTONICS 2010) IIT Guwahati, India (2010).



4. "Development of 300 J pulse energy in long pulse operation of Nd: YAG Laser",
   B. N. Upadhyaya, Puskar Misra, S. C. Vishwakarma, Ambar Choubey, R. Arya, Sajith Kumar, Manoj Kumar, Vijay Bhawsar, A. Raju, R. K. Jain, Sabir Ali, D. K. Agrawal, S. M. Oak,
   Proceedings of National Laser Symposium-19, RRCAT, Indore, India (2010).



5. "Development of ceramic reflector based pump cavity for high average power pulsed Nd: YAG laser",
   Ambar Choubey, R. K. Jain, Ravindra Singh, Sabir Ali, S. C. Vishwakarma, D. K. Agrawal, Puskar Misra, B. N. Upadhyaya, S. M. Oak,
   Proceedings of National Laser Symposium-19, RRCAT, Indore, India (2010).



6. "Development of a 5 W CW single transverse mode Er:Yb co-doped fiber laser at 1565 nm",
   G. Srikanth, B. N. Upadhyaya, B. K. Saini, and S. M. Oak,
   Proceedings of National Laser Symposium-19, RRCAT, Indore, India (2010).



7. "Operation of Yb-doped double clad fiber laser at different center wavelengths by using Fiber Bragg Grating mirrors",
   Usha Chakravarty, B. N. Upadhyaya, A. Kuruvila, S. M. Oak,
   Proceedings of National Laser Symposium-19, RRCAT, Indore, India (2010).



8. "Development of fiber-coupled short pulsed Nd: YAG laser for cleaning applications",
   Ambar Choubey, Ravindra Singh, S.C.Vishvakarma, Pushkar Misra, D.M.Vachhani, R.K.Jain, K.K.Pant, R.Arya, B. N. Upadhyaya, S. M. Oak,
   Proceedings of National Laser Symposium-19, RRCAT, Indore, India (2010).



9. "Development of 8.5 W Yb-doped double-clad CW fiber laser at 1030nm",
   G. Srikanth, B. N. Upadhyaya, Jitendra Kumar, S. K. Dixit, Rajpal Singh, R. K. Jain, S. M. Oak,
   Proceedings of National Laser Symposium-19, RRCAT, Indore, India (2010).

YEAR 2011

1. "Realization of 43 W of single-mode linearly polarized Yb-doped photonic crystal fiber laser",
   Usha Chakravarty, A. Kuruvilla, B. N. Upadhyaya, S. M. Oak,
   Proceedings of International Conference on Specialty Glass & Optical Fiber: Materials, Technology and Devices (ICGF-2011), CGCRI, Kolkata, India (2011).



2. "Generation of 17 W of Narrow Linewidth CW fiber laser at 1030 nm and Second Harmonic Conversion at 515 nm",
   G. Srikanth, B. N. Upadhyaya, Jitendra Kumar, S. K. Dixit, Rajpal Singh, R. K. Jain, S. M. Oak,
   Proceedings of International Conference on Specialty Glass & Optical Fiber: Materials, Technology and Devices (ICGF-2011), CGCRI, Kolkata, India (2011).



3. "Thermal Birefringence Compensation in High Power Single Rod Pulsed nd:YAG Laser"
   Shyamal Mondal, Kamal Hussain, Satya Pratap Singh, A. Choubey, B. N. Upadhyay and Prasanta Kumar Datta,
   Proceedings of International Conference on Theoretical and Applied Physics(ICTAP), IIT Kharagpur, India (2011).

YEAR 2012

1. "Study and Development of 165 W of Single Transverse Mode Yb-doped CW Fiber Laser",
   B. N. Upadhyaya, Pushkar Misra, Antony Kuruvilla, R.K. Jain, Rajpal Singh, K.S. Bindra and S. M. Oak,
   Proceedings of International Conference on Fiber Optics and Photonics (PHOTONICS 2012) IIT Chennai, India (2012).



2. "Study of CW and pulsed amplification in Yb-doped fiber amplifier",
   Usha Chakravarty,G. Srikanth, B.N.Upadhyaya, K. S. Bindra, S.M.Oak,
   Proceedings of International Conference on Fiber Optics and Photonics (PHOTONICS 2012) IIT Chennai, India (2012).



3. "Study on effective laser cleaning method of carbon layer from gold surface",
   Singh Amol, Choubey A.K., Modi Mohammed H., Upadhyaya B.N., Lodha G.S.,
   Proceedings of 11th International Conference on Synchrotron Radiation Instrumentation, SRI 2012, TH-O-P-23, Lyon, France (2012).



4. "Development of 1 kW average power fiber coupled pulsed Nd:YAG laser",
   Ambar Choubey, S. C. Vishwakarma, Pushkar Misra, R. K. Jain, D. K. Agrawal, Sajith Kumar, Manoj Kumar, A. A. Raju, S. K. Sah, Vijay Bhawsar, R. Arya, B. N. Upadhyaya, and S. M. Oak,
   Proceedings of National Laser Symposium-20, Chennai, India (2012).



5. "Development of 120 W of single transverse mode Yb-doped CW fiber laser",
   Antony Kuruvilla, Pushkar Misra, R. K. Jain, Rajpal Singh, B. K. Saini, B. N. Upadhyaya, and S. M. Oak,
   Proceedings of National Laser Symposium-20, Chennai, India (2012).



6. "Deep penetration welding of aluminum using high average power pulsed Nd:YAG Laser",
   D. K. Agrawal, Pushkar Misra, Ambar Choubey, R. K. Jain, Rajpal Singh, S. C. Vishwakarma, B. N. Upadhyaya, and S. M. Oak, Proceedings of National Laser Symposium-20, Chennai, India (2012).



7. "Birefringence compensation in multimode long pulse Nd:YAG laser",
   Ravindra Singh, Ambar Choubey, Shyamal Mondal, Sabir Ali, B. N. Upadhyaya, P. K. Datta, S. M. Oak,
   Proceedings of National Laser Symposium-20, Chennai, India (2012).



8. "Development of Vacuum Grade Leak Tight Laser Welding Technique for 3 mm Thick Titanium",
   R. K. Jain, Ambar Choubey, D. K. Agrawal, S. C. Vishwakarma, B. N. Upadhyaya, P. Ganesh, R. Kaul, D. P. Yadav, Ram Shiroman and S. M. Oak,
   Proceedings of National Laser Symposium-20, Chennai, India (2012).



9. "Development of 490 W average power long pulse Nd:YAG laser based on diffuse ceramic reflectors",
   Ambar Choubey, R. K. Jain, Ravindra Singh, Sabir Ali, D. K. agrawal, Rajpal Singh, B. K. Saini, S. C. Vishwakarma, Pushkar Misra, B. N. Upadhyaya, and S. M. Oak,
   Proceedings of National Laser Symposium-20, Chennai, India (2012).



10. "Mode-locked Yb-doped fiber oscillator in all-normal-dispersion regime with long gain element: studies on Spectral and temporal profiles",
    P. K. Mukhopadhyay, S. K. Sharma, P. K. Gupta, B. N. Upadhyay, Usha Chakravarty, A. J. Singh, Jogy George, K. S. Bindra and S. M. Oak,
    Proceedings of National Laser Symposium-20, Chennai, India (2012).



11. "Demonstration more than 160mW of gain switched 1240 nm Laser in linear cavity using 8 mm long Cr:Forsterite crystal",
    J. George, K.S. Bindra, P.K. Mukhopadhyay, S. K. Sharma, K. Ranganathan, B. N. Upadhyaya and S. M. Oak,
    Proceedings of National Laser Symposium-20, Chennai, India (2012).

Newsletter

YEAR 2011

1. "Studies on Yb-doped double-clad CW and pulsed fiber lasers",
   B. N. Upadhyaya,
   RRCAT Newsletter 24(1), 43, (2011).



2. "Development of 300 J pulse energy long pulse Nd:YAG laser",
   B. N. Upadhyaya, R. Arya, S. C. Vishwakarma, Pushkar Misra, Ambar Choubey, Sajith Kumar, Manoj Kumar, Vijay Bhawsar, A. Raju, R. K. Jain, Sabir Ali, D. K. Agrawal, and S. M. Oak,
   RRCAT Newsletter, 24(1), 17, (2011).



3. "Development of underwater laser cutting technique for steel and zircaloy for nuclear applications",
   B. N. Upadhyaya, R. K. Jain, Ambar Chjoubey, S. C. Vishwakarma, Ravindra Singh, Sabir Ali, D. K. Agrawal, and S. M. Oak,
   RRCAT Newsletter 24(1), 20, (2011).



4. "Development of Laser Cutting and Welding Technique for Secondary Shutdown System Standpipe Bellow Repair of Pressurized Heavy Water Reactors",
   B. N. Upadhyaya, S. C. Vishwakarma, S. M. Oak,
   RRCAT Newsletter 24(2), 18, (2011).



5. "High Power Nd:YAG Lasers in Indian Nuclear Power Plants",
   B. N. Upadhyaya, S. C. Vishwakarma, R. Arya and S. M. Oak,
   ILA Bulletin KIRAN, 22(2), 3, (2011)

YEAR 2012

1. "High power Yb-doped CW fiber lasers",
   B. N. Upadhyay, K. S. Bindra and S. M. Oak,
   ILA Bulletin KIRAN, 23(2), 11, (2012).