Compact eye-safe laser sources based on OPOs with KTP or PPKTP crystals
- 作者：Liviu Neagu ; Constantin Ungureanu ; Razvan Dabu ; Aurel Stratan ; Constantin Fenic ; Laurentiu Rusen
- 关键词：Eye safe laser radiation ; Nanosecond optical parametric oscillator ; Non-critical phase-matching
- 刊名：Optics and Laser Technology
- 出版年：2007
- 期刊代码：48_00303992
- 类别：ph
- 出版时间：July 2007
- 卷：39
- 期：5
- 页码：973-979
- 文件大小：801 K
摘要
We report on compact eye-safe nanosecond laser sources emitting in the 1.5 μm wavelength range based on non-critically phase-matched parametric interaction in optical parametric oscillators (OPOs) with KTP and periodically poled KTP (PPKTP) crystals, pumped by the fundamental frequency of Nd:YAG lasers. As much as 250 μJ signal pulse energy at 1.5 μm wavelength, 6.5 ns FWHM pulse-width, has been obtained in a PPKTP-OPO, extracavity pumped by a Nd:YAG microlaser oscillator–amplifier at 650 μJ pump pulse energy, 8 ns pulse-width. A single signal pulse of 2.7-mJ output energy at 1.57 μm wavelength, less than 5 ns pulse-width, was generated in a KTP-OPO, intracavity pumped by a passively Q-switched Nd:YAG laser.