Eye-Safe Extracavity Raman Laser: a Passive Way of Eliminating Optical Feedback with Double-Pass Pumping

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...

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Bibliographic Details
Published in:Journal of applied spectroscopy 2017, Vol.83 (6), p.945-950
Main Authors: Dashkevich, V. I., Rusak, A. A., Orlovich, V. A., Shkadarevich, A. P.
Format: Article
Language:English
Subjects:
Analytical Chemistry
Atomic/Molecular Structure and Spectra
Comparative analysis
Energy conversion efficiency
Lasers
Optical feedback
Optical pumping
Physics
Physics and Astronomy
Pulse duration
Radiation (Physics)
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Summary: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 4 ) 2 Raman laser pumped by a pulsed KGd(WO 4 ) 2 :Nd laser with the working transition F 3 / 2 4 → I 13 / 2 4 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.
ISSN:0021-9037
1573-8647
DOI:10.1007/s10812-017-0388-4