A high power, short pulse stimulated Raman source at 1.54 μm

Hanna, D.C.; Pointer, D.

doi:10.1016/0030-4018(86)90176-8

Cited by 10 publications

(1 citation statement)

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“…For example, in Fig. 2, only a raw beam at 1.06 micron is shown to be incident on the Key to the figure : (1) Nd : YAG laser rod, with end E 2 AR-coated and the end El with 50% reflectivity, (2) linear flash lamp filled with xenon gas, (3) energy storage capacitor, (4) power supply for flash lamp, along with pulse-forming network and triggering circuit, (5) dye Q-switch for passive Q-switching of 1.06 p m radiation, (6) Porro prism, (7) rhomboid prism (folding prism), (8) Raman cell with Brewster windows, (9) methane gas at a pressure between 50 and 70 atmospheres, (10) concave mirror with 90% transmissicn for 1.6 p m radiation and about 100% reflectivity for 1.54 p m wavelength, (11) concave mirror with about 100% reflectivity for 1.06 11 m wavelength and about 50% reflectivity for 1.54 p m wavelength, (12), (25) interference filters allowing only 1.54 p m radiation to pass through and blocking all other wavelengths, (13) Raman cell. We may experiment with various types of focussing geometry and come to an optimum conclusion at that stage only.…”

Section: Design Considerations Of Raman-shifted Methane Lasermentioning

confidence: 99%

Nd: YAG Laser-Pumped Raman-Shifted Methane Laser as an Eye-safe Laser Rangefmder

Dudeja¹

1989

DSJ

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In this article, a feasibility study of the design and performance of a laser rangehnder 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 micron is used as pumping source that is incident on a Raman cell containing methane gas at a very high pressure, rsulting in the Stokes radiation at 1.54 micron. Conversion efficiencies as higb 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 Qmits. 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 CO, lasers. A comparison of this laser emitting at 1.54 micron, with Er : glass laser emitting at the same wavelength, is also discussed.

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Section: Design Considerations Of Raman-shifted Methane Lasermentioning

confidence: 99%