利用一台Nd:YAG激光器泵浦的两台Cr:镁橄榄石激光器产生单频相干太赫兹波。

Single-frequency coherent terahertz-wave generation using two Cr:forsterite lasers pumped using one Nd:YAG laser.

作者信息

Nishizawa Jun-ichi, Sasaki Tetsuo, Tanabe Tadao, Hozumi Norimitsu, Oyama Yutaka, Suto Ken

机构信息

Semiconductor Research Institute, Aoba 519-1176, Aramaki, Aoba-ku, Sendai 980-0845, Japan.

出版信息

Rev Sci Instrum. 2008 Mar;79(3):036101. doi: 10.1063/1.2884926.

DOI:10.1063/1.2884926

PMID:18377046

Abstract

We have developed a compact terahertz-wave generator using two small Cr:forsterite lasers with single Nd:YAG laser pumping based on difference frequency generation in a GaP crystal. A Cr:forsterite laser was constructed with diffraction gratings, by which the pulse duration and delay time of the Cr:forsterite laser depend on the Cr:forsterite laser energy and the cavity length. The Cr:forsterite laser energy was tuned using the optical alignment and pumping energy. Temporal overlap of two Cr:forsterite laser pulses was realized at the GaP crystal. A single-frequency terahertz wave was generated at energy of 4.7 pJ around 2.95 THz using a 30-cm-long Cr:forsterite laser system.

摘要

我们基于GaP晶体中的差频产生，利用两台小型Cr:镁橄榄石激光器和单台Nd:YAG激光器泵浦，开发了一种紧凑型太赫兹波发生器。一台Cr:镁橄榄石激光器由衍射光栅构成，通过它，Cr:镁橄榄石激光器的脉冲持续时间和延迟时间取决于Cr:镁橄榄石激光器的能量和腔长。利用光学准直和泵浦能量对Cr:镁橄榄石激光器的能量进行调谐。在GaP晶体处实现了两个Cr:镁橄榄石激光脉冲的时间重叠。使用一个30厘米长的Cr:镁橄榄石激光系统，在2.95太赫兹左右以4.7皮焦的能量产生了单频太赫兹波。