Self-frequency doubling laser performance of Nd:GdCOB crystal with a phase-matching angle out of the principal plane

Jun Hua Lü, Guang Ming Li, Jun Hai Liu, Shujun Zhang, Huan Chu Chen, Min Hua Jiang, Zong Shu Shao

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The self-frequency doubling laser performance of Nd:GdCOB crystal cut in phase-matching direction (θ = 66.3°, φ = 134.4°) was compared with the crystal cut in the direction of (θ = 90°, φ = 46°). Results show that the former has a higher second-harmonic conversion efficiency than the latter. Using Ti:sapphire laser as pumping source, a maximum of 11.3m W of green light has been obtained with an incident power of 520 mW. This corresponds to an optical-optical conversion efficiency of 2.2%. Laser threshold for self-frequency doubling operation is measured to be 1 mW. To our knowledge, this is the lowest threshold achieved so far.

Original languageEnglish (US)
Pages (from-to)651-652
Number of pages2
JournalChinese Physics Letters
Issue number9
Publication statusPublished - Dec 1 1999


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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