Noise-free terahertz-wave parametric generator

被引：10

作者：

Mine, Sota ^{[1
]}

Kawase, Kodo ^{[1
]}

Murate, Kosuke ^{[1
]}

机构：

[1] Nagoya Univ, Dept Elect, Furocho, Nagoya, Aichi 4648603, Japan

来源：

OPTICS LETTERS | 2022年 / 47卷 / 05期

基金：

日本学术振兴会;

关键词：

INJECTION; SYSTEM;

D O I：

10.1364/OL.448636

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We achieved noise-free terahertz (THz)-wave output from an injection-seeded THz-wave parametric generator (is-TPG) employing high-power injection seeding. A conventional is-TPG uses a weak continuous-wave (CW) seed beam. The position in which broadband noise is generated (via spontaneous parametric down-conversion) and the position of the THz signal overlap. Thus, the output features broadband TPG noise, reducing the signal-to-noise ratio. To solve this problem, we shifted the position in which the THz signal is generated to the front of the crystal; we separated the signal from broadband TPG noise using a high-powered, pulsed seed beam that was 10(7)-fold more powerful than the CW seed beam. Thus, we extracted only the THz signal; we achieved a noise-free is-TPG. This system features a signal-to-noise ratio of 95dB, approximately 40dB better than the signal-to-noise ratio of the conventional system. (C) 2022 Optica Publishing Group

引用

收藏

页码：1113 / 1116

页数：4

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