在 KTiOPO4 中实现高重复频率近红外非共线超宽带光参量放大。

High-repetition-rate near-infrared noncollinear ultrabroadband optical parametric amplification in KTiOPO4.

机构信息

Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms-Universität, Wegelerstrasse 12, Bonn, 53115, Germany.

出版信息

Opt Lett. 2010 Nov 15;35(22):3832-4. doi: 10.1364/OL.35.003832.

DOI:10.1364/OL.35.003832

PMID:21082012

Abstract

We report efficient noncollinear optical parametric amplification (NOPA) of ultrabroadband near-IR pulses tunable in the 1.1-1.5 μm range at a repetition rate of 250 kHz. Improved generation of smooth near-IR continua (extending over ~1.0-1.6 μm) at 250 kHz was achieved by weakly focusing ~20% of the 1 W driving laser beam into a sapphire plate with longer focal length lenses than previously reported. Using bulk potassium-titanyl phosphate (KTiOPO(4)) pumped at 800 nm, powers as high as 11 mW (14% pump conversion efficiency) and signal pulse durations as short as 23 fs were obtained after a single white-light seeded NOPA stage.

摘要

我们报告了高效的非共线光参量放大（NOPA），可在 250 kHz 的重复率下将带宽可调谐的超宽带近红外脉冲调谐到 1.1-1.5 μm 范围内。通过将约 20%的 1 W 驱动激光束弱聚焦到具有比以前报道的更长焦距透镜的蓝宝石板中，在 250 kHz 时实现了近红外连续谱的平滑改善（延伸至约 1.0-1.6 μm）。使用在 800nm 处泵浦的块状钛酸钾磷酸（KTiOPO(4)），在单个白光种子 NOPA 级之后，获得了高达 11 mW（14%的泵浦转换效率）的功率和最短为 23 fs 的信号脉冲持续时间。