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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51370

Title: Realizing high-pulse-energy large-angular-momentum beams by astigmatic transformation of geometric modes in an Nd:YAG/Cr4+:YAG laser
Authors: P. H. Tuan
H. C. Liang
K. F. Huang
Y. F. Chen
Contributors: 國立臺灣海洋大學:光電與材料科技學士學位學程(學系)
Keywords: Laser excitation
Laser beams
Cavity resonators
Optical resonators
Optical beams
Crystals
Laser modes
Date: 2018-09
Issue Date: 2018-11-23T08:42:40Z
Publisher: IEEE Journal of Selected Topics in Quantum Electronics
Abstract: Abstract: An off-axis pumped Nd:YAG/Cr 4+ :YAG laser under different degenerate cavity conditions has been thoroughly studied to generate high-pulse-energy geometric modes for further beam transformation. Because of the employment of Nd:YAG gain crystal provides a flexible choice of cavity length to achieve efficient passively Q-switched (PQS) operation, various PQS geometric modes with stable spatial structures are generated. Moreover, it is experimentally confirmed that the output energy and peak power of the PQS geometric modes can easily reach up to over 100 μJ and 10 kW with fairly stable pulse trains in pure linear polarization. By using an astigmatic mode converter (AMC) to transform the planar geometric modes into the circular geometric modes, various high-energy vortex beams with large angular momentum and diverse phase structures are successfully realized to offer a promising light source for further application. The propagation evolution of the transformed geometric modes through the AMC was also analyzed theoretically to offer useful insights for the formation of the geometric vortex beams.
Relation: 24(5)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51370
Appears in Collections:[光電科學研究所] 期刊論文

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