中红外频域光参量放大器。

Mid-infrared frequency domain optical parametric amplifier.

出版信息

Opt Express. 2023 Apr 24;31(9):14954-14964. doi: 10.1364/OE.487813.

Abstract

We report on an optical architecture delivering sub-120 femtosecond laser pulses of 20 µJ tunable from 5.5 µm to 13 µm in the mid-infrared range (mid-IR). The system is based on a dual-band frequency domain optical parametric amplifier (FOPA) optically pumped by a Ti:Sapphire laser and amplifying 2 synchronized femtosecond pulses each with a widely tunable wavelength around 1.6 and 1.9 µm respectively. These amplified pulses are then combined in a GaSe crystal to produce the mid-IR few-cycle pulses by means of difference frequency generation (DFG). The architecture provides a passively stabilized carrier-envelope phase (CEP) whose fluctuations has been characterized to 370 mrad RMS.

摘要

我们报告了一种光学架构，可提供可调谐从中红外（mid-IR）5.5 µm 到 13 µm 的 20 µJ 的亚 120 飞秒激光脉冲。该系统基于双波段频域光参量放大器（FOPA），由钛宝石激光器泵浦并放大两个同步飞秒脉冲，每个脉冲的波长在 1.6 和 1.9 µm 附近均可宽范围调谐。这些放大的脉冲随后在 GaSe 晶体中组合，通过差频产生（DFG）产生 mid-IR 少周期脉冲。该架构提供了被动稳定的载波包络相位（CEP），其波动已被表征为 370 mrad RMS。