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- Title
Eye-Safe Extracavity Raman Laser: a Passive Way of Eliminating Optical Feedback with Double-Pass Pumping.
- Authors
Dashkevich, V.; Rusak, A.; Orlovich, V.; Shkadarevich, A.
- Abstract
A passive way of eliminating optical feedback between a pump laser and an extracavity two-pass pumped Raman laser in a compact arrangement was demonstrated. Feedback was suppressed by arranging the circuit elements in a configuration where the pump-laser 100% mirror and the Raman-laser output mirror formed an unstable cavity characterized by a substantially higher threshold for generating the fundamental radiation as compared with the stable pump-laser cavity. The method was demonstrated using an eye-safe KGd(WO) Raman laser pumped by a pulsed KGd(WO):Nd laser with the working transition $$ {}^{{}^4}F_{3/2}\to {}^4I_{13/2} $$ as an example. The Raman laser emitted pulses of energy ~11.5 mJ at an electrical pump energy of ~10 J, corresponding to a conversion efficiency of ~31%. The Stokes pulse width (~17 ns) was comparable to the pump pulse width (~20 ns) owing to the extracavity location of the Raman laser.
- Subjects
RAMAN lasers; OPTICAL feedback; OPTICAL pumping; RADIATION; LASER pulses; STOKES radiation
- Publication
Journal of Applied Spectroscopy, 2017, Vol 83, Issue 6, p945
- ISSN
0021-9037
- Publication type
Article
- DOI
10.1007/s10812-017-0388-4