Hollow circular-truncated cone resonator and its hollow variable biconical laser beam

Jinglun Liu; Mei Chen; Qionghua Wang; Nianchun Sun

doi:10.1117/1.OE.53.5.056113

21 May 2014 Hollow circular-truncated cone resonator and its hollow variable biconical laser beam

Jinglun Liu, Mei Chen, Qionghua Wang, Nianchun Sun

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Optical Engineering, Vol. 53, Issue 5, 056113 (May 2014). https://doi.org/10.1117/1.OE.53.5.056113

Abstract

To obtain a hollow variable biconical laser beam (HVBLB), a CO₂ laser having a hollow circular-truncated cone resonator (HCTCR) is presented. This HCTCR comprises a rotationally symmetric total-reflecting concave mirror at the bottom, a rotationally symmetric part-reflecting convex mirror at the top, and a hollow circular-truncated cone discharge tube at the middle. The cross section of this generated biconical laser beam changes from annulus to circular to annulus and the size of this cross section from big to small to large as the propagation distance increases. So, a kind of laser beam with variable center intensity from zero to peak value to zero is obtained and is known as HVBLB. Due to the inclusion of part of the hollow laser beam (HLB) and solid laser beam, this HVBLB requires no additional beam-shaping element and has broad applications such as optical trapping and commercial manufacturing.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Jinglun Liu, Mei Chen, Qionghua Wang, and Nianchun Sun "Hollow circular-truncated cone resonator and its hollow variable biconical laser beam," Optical Engineering 53(5), 056113 (21 May 2014). https://doi.org/10.1117/1.OE.53.5.056113

Published: 21 May 2014

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KEYWORDS

Mirrors

Resonators

Gas lasers

Reflectors

Laser resonators

Carbon monoxide

Laser beam propagation

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