Cascaded Raman lasing in a multimode diode-pumped graded-index fiber

被引：0
|
作者：
Kuznetsov, Alexey G. [1 ]
Nemov, Ilya N. [1 ]
Wolf, Alexey A. [1 ]
Kablukov, Sergey, I [1 ]
Babin, Sergey A. [1 ,2 ]
机构：
[1] SB RAS, Inst Automat & Electrometry, 1 Koptyug Ave, Novosibirsk 630090, Russia
[2] Novosibirsk State Univ, 2 Pirogova Str, Novosibirsk 630090, Russia
来源：
NONLINEAR FREQUENCY GENERATION AND CONVERSION: MATERIALS AND DEVICES XXI | 2022年 / 11985卷
基金：
俄罗斯科学基金会;
关键词：
fiber laser; Raman laser; diode pumping; graded-index fiber; multimode; beam clean-up; pump depletion; FBG; mode selection; random coupling; BEAM CLEANUP; LASER;
D O I：
10.1117/12.2610384
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Graded-index fibers enable efficient Raman conversion of multimode radiation into a Stokes beam with improved beam quality offering new approach for high-brightness diode-pumped all-fiber tunable lasers. Here we study an opportunity to broaden the operating wavelength range via cascaded Raman lasing in such scheme. Highly-multimode 940-nm laser-diode radiation is serially converted into the 1st(976nm), 2nd(1019nm) and 3rd(1065 nm) order Stokes beam. At the conversion the beam quality is greatly improved approaching diffraction limit (M-2<1.4). Linear and half-open cavities are compared showing that the conversion efficiency is higher for half-open cavity, whereas the threshold is lower for linear cavity that was used for the 3rd-order generation. Generation of 3rd Stokes order is accompanied by unstable pulsations with higher (4th and 5th) orders involved in the lasing with total power of similar to 4 W, while its beam quality worsens to M-2 similar to 2.
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页数：6
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