部分氘化 KDP 晶体中掺钕玻璃激光器的非临界相位匹配四倍频。

Noncritically phase-matched fourth harmonic generation of Nd:glass lasers in partially deuterated KDP crystals.

机构信息

Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA.

出版信息

Opt Lett. 2011 May 15;36(10):1824-6. doi: 10.1364/OL.36.001824.

DOI:10.1364/OL.36.001824

Abstract

Noncritically phase-matched (NCPM) fourth harmonic generation (FHG) of Nd:glass laser radiation in partially deuterated dihydrogen phosphate (KDP) crystals has been demonstrated. At an Nd:glass laser wavelength of 1053.0 nm, NCPM FHG is achieved in 70% deuterated KDP at a crystal temperature of 18.5±0.1 °C. Tuning the fundamental laser wavelength from 1052.9 to 1053.2 nm, FHG in KDP is NCPM by changing the crystal temperature from 17.9 °C to 20.5 °C. When driven with 2.4 J of second harmonic radiation in a 3 ns flat-top pulse, corresponding to 1 GW/cm(2) 2ω drive intensity, 1.9 J of fourth harmonic radiation was generated in a 6 mm long KDP crystal, yielding a second to fourth harmonic energy conversion efficiency of 79%.

摘要

已在部分氘化二氢磷酸盐（KDP）晶体中演示了非临界相位匹配（NCPM）的掺钕玻璃激光辐射的四次谐波产生（FHG）。在 Nd:玻璃激光波长为 1053.0nm 时，在温度为 18.5±0.1°C 的 70%氘化 KDP 中实现了 NCPM FHG。通过将基频激光波长从 1052.9nm 调谐至 1053.2nm，通过将晶体温度从 17.9°C 改变至 20.5°C，可在 KDP 中实现 NCPM FHG。当在 3ns 平顶脉冲中用 2.4J 的二次谐波辐射驱动时，在 6mm 长的 KDP 晶体中产生了 1.9J 的四次谐波辐射，在二次谐波到四次谐波的能量转换效率为 79%时，产生了 1GW/cm(2) 2ω 驱动强度。