| || Nd: YAG Laser Pumped Raman Shifted Methane Laser as an Eye Safe Laser Rangefinder
Author : Dudeja, Jai Paul
Source : Defence Science Journal ; Vol:39(3) ; 1989 ; pp 221-232
Subject : 621.375.826 Laser Science;681.783.2 Laser Range Finder
Keywords : Military rangefinder;Glass laser
Abstract : In this article, a feasibility study of the design and performance of a laser rangefinder emitting at an eye-safe wavelength of 1.54 micron, is reported. It is a Raman-shifted laser where an Nd: YAG laser emitting at a wavelength of 1.06 microm is used as pumping source that is incident in a Raman cell containing methane gas at a very high pressure, resulting in the Stokes radiation at 1.54 micron. Conversion efficiencies as high as 40 per cent have been reported so far by some workers and continued efforts are on to increase this value close to the theoretical limits. A comparative performance of this laser, proposed as a futuristic military rangefinder, is studied vis-a-vis commonly used Nd: YAG lasers as well as more recent rangefinders using Carbon di Oxide lasers. A comparison of this laser emitting at 1.54 micron, with Er: glass laser emitting at the same wavelength, is also discussed.