Development of Optical Parametric Oscillator Tunable in the Range 970-1460 nm

S. P. Singh; Shyamal Mondal; Kamal Hussain; P. K. Datta

doi:10.14429/dsj.61.562

S. P. Singh Indian Institute of Technology Kharagpur, Kharagpur
Shyamal Mondal Indian Institute of Technology Kharagpur, Kharagpur
Kamal Hussain Indian Institute of Technology Kharagpur, Kharagpur
P. K. Datta Indian Institute of Technology Kharagpur, Kharagpur

DOI: https://doi.org/10.14429/dsj.61.562

Keywords: Nonlinear optics, second harmonic generation, optical parametric oscillator, nanosecond OPO, synchronised OPO

Abstract

Optical parametric oscillator (OPO) tunable in the range 970-1460 nm has been developed using bet barium borate (BBO) crystal as the gain medium and second harmonic of Nd:YAG laser as pump source. Two sets of resonators were used to cover the range; first was nearly degenerate (970-1180 nm) and the second was nondegenerate (1240-1460 nm). The measured threshold pump pulse energy was nearly 8 mJ. Maximum signal pulse energy of about 14 mJ was obtained for pump pulse energy of nearly 31 mJ. Power scaling efficiency was about 70 per cent. The signal pulse width was ~5 ns corresponding to the pump pulse width of ~ 9 ns. OPO signal beam quality was Gaussian although the pump beam was top-hat multimode.

Defence Science Journal, 2011, 61(4), pp.377-382, DOI:http://dx.doi.org/10.14429/dsj.61.562

Author Biographies

S. P. Singh, Indian Institute of Technology Kharagpur, Kharagpur

Mr S.P. Singh did his MTech (Solid-state Technology) from IIT Kharagpur in 2010. Presently, he is pursuing his PhD at IIT Kharagpur. His research interests are in mid-infrared optical parametric amplifier and Optical parametric oscillator and ultrafast fibre lasers. He is a life member of Indian Laser Association.

Shyamal Mondal, Indian Institute of Technology Kharagpur, Kharagpur

Mr Shyamal Mondal completed his MTech (Microelectronics) from Jadavpur University in 2009. Currently pursuing his PhD at IIT Kharagpur. His current research interests are in solid state lasers, gas lasers, fibre optics, and nonlinear optics. He is a life member of Indian Laser Association.

Kamal Hussain, Indian Institute of Technology Kharagpur, Kharagpur

Mr K. Hussain received his MSc from IIT Roorkee in 2006 and currently pursuing his PhD at IIT Kharagpur. In 2008, he received an Indo-Italy scholarship and worked with CEIIC lab, Sant’ Anna University, Italy. His current research interests are semiconductor optical amplifier-based nonlinear optical devices like wavelength converters, logic operators, switches, etc. He is a life member of Indian Laser Association.

P. K. Datta, Indian Institute of Technology Kharagpur, Kharagpur

Dr P.K. Datta obtained his PhD from Burdwan University in 1994. Currently working at IIT Kharagpur. His areas of interest include: Semiconductor optical amplifier-based photonic devices, optical parametric amplifiers and oscillators, and ultrafast nonlinear optics. He has published 48 papers in various journals.