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High repetition rate 102 W middle infrared ZnGeP 2 master oscillator power amplifier system with thermal lens compensation

  • Harbin Institute of Technology

Research output: Contribution to journalArticlepeer-review

Abstract

We demonstrate a 102 W middle infrared ZnGeP 2 (ZGP) optical parametric amplifier (OPA) pumped by a 2097-nm Q-switched Ho:YAG laser at a pulse repetition frequency of 10 kHz. The seed middle infrared laser was produced by a ZGP optical parametric oscillator. Its average power was 28.4 W pumped by a 50 W 2097-nm laser. By thermal lens compensation, the beam factor M 2 reduced from 3.1 to 2.1. When the incident Ho pump power was 120 W, the middle infrared ZGP OPA yielded the maximum average output power of 102 W and slope efficiency of 61.7%. The overall optical conversion efficiency of 60% from Ho to middle infrared was obtained for the whole middle infrared laser system. In addition, at the maximum average output power, the beam quality factors of the middle infrared ZGP OPA were measured to be about 2.7 and 2.8 for horizontal and vertical directions, respectively.

Original languageEnglish
Pages (from-to)715-718
Number of pages4
JournalOptics Letters
Volume44
Issue number3
DOIs
StatePublished - 1 Feb 2019

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