Published January 1, 2021 | Version v1
Journal article Metadata-only

Generation of an optical beam with two-dimensional dark focus in a fractionally-degenerate cavity

Creators

  • 1. P. N. Lebedev Physical Institute of the Russian Academy of Sciences, Leninskiy Prospect 53, Moscow 119991 (Russian Federation)
  • 2. Department of Physics and International Laser Center, Lomonosov Moscow State University, Leninskie Gory 1, Korp. 62, Moscow 119991 (Russian Federation)

Description

An optical beam with a dark region surrounded by light in two dimensions, formed as a coherent superposition of mainly two Hermite–Gaussian eigenmodes HG04 and HG08, has been generated in an axially end-pumped Nd:YAG laser with an astigmatic fractionally degenerate semiconfocal cavity with an intracavity obstacle (a needle). Being focused with a lens, the beam has a dark region on its axis, surrounded by high-intensity regions only in z- and y-directions while maintaining Gaussian behavior in the x direction. The influence of the number of HG0n eigenmodes and comparison of the beam with a geometric M-mode are studied numerically. (paper)

Availability note (English)

Available from http://dx.doi.org/10.1088/1555-6611/abcd3f

Additional details

Identifiers

DOI
10.1088/1555-6611/abcd3f;

Publishing Information

Journal Title
Laser Physics (Online)
Journal Volume
31
Journal Issue
1
Journal Page Range
[6 p.]
ISSN
1555-6611

INIS

Country of Publication
Russian Federation
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
53092041
Subject category
S71: CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS;
Descriptors DEI
BEAMS; COMPARATIVE EVALUATIONS; LENSES; NEODYMIUM LASERS; PUMPS
Descriptors DEC
EQUIPMENT; EVALUATION; LASERS; SOLID STATE LASERS