Sharp focusing of superpositions of Hermite-Gaussian modes locked in fractionally degenerate cavity

被引：4
|
作者：
Gorbunkov, M. V. [1 ]
Kostryukov, P. V. [1 ]
Tunkin, V. G. [2 ,3 ]
机构：
[1] Russian Acad Sci, PN Lebedev Phys Inst, Leninskiy Prospect 53, Moscow 119991, Russia
[2] Lomonosov Moscow State Univ, Dept Phys, Leninskie Gory 1,Korp 62, Moscow 119991, Russia
[3] Lomonosov Moscow State Univ, Ctr Int Laser, Leninskie Gory 1,Korp 62, Moscow 119991, Russia
来源：
LASER PHYSICS | 2019年 / 29卷 / 11期
关键词：
end-pumped lasers; degenerate cavity configurations; transverse mode locking; sharp focusing; FUNDAMENTAL MODE; BOTTLE BEAM; GENERATION; LOCKING; LASER;
D O I：
10.1088/1555-6611/ab4649
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We investigate, experimentally and numerically, sharp focusing of superpositions of Hermite-Gaussian modes obtained at transverse mode locking in an end-pumped laser with a fractionally degenerate cavity. Being focused with a lens, these beams create quasi-waists that are shorter and narrower as compared to the waist of a zero-order Gaussian mode. Comparison with the case of Laguerre-Gaussian superpositions showed that both mode families demonstrate similar sharp-focusing behavior in terms of the longitudinal and transverse scales, but the superpositions of Hermite-Gaussian modes have substantially non-zero on-axis intensity between the quasi-waists.
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页数：6
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