Optical feedback frequency stabilized cavity ring-down spectroscopy

被引：57

作者：

Burkart, Johannes ^{[1
,2
]}

Romanini, Daniele ^{[1
,2
]}

Kassi, Samir ^{[1
,2
]}

机构：

[1] Univ Grenoble Alpes, LIPhy, F-38000 Grenoble, France

[2] CNRS, LIPhy, F-38000 Grenoble, France

来源：

OPTICS LETTERS | 2014年 / 39卷 / 16期

关键词：

BAND;

D O I：

10.1364/OL.39.004695

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We introduce optical feedback frequency stabilized cavity ring-down spectroscopy (OFFS-CRDS), a near-shot-noise-limited technique that combines kilohertz resolution with an absorption detection sensitivity of 5 x 10(-13) cm(-1) Hz(-1/2). Its distributed feedback laser source is stabilized to a highly stable V-shaped reference cavity by optical feedback and fine-tuned by means of single-sideband modulation. The stability of this narrow laser is transferred to a ring-down (RD) cavity using a new fibered Pound-Drever-Hall (PDH) locking scheme without a dedicated electro-optic phase modulator, yielding several hundred RD events per second. We demonstrate continuous coverage of more than 7 nm with a baseline noise of 5 x 10(-12) cm(-1) and a dynamic range spanning six decades. With its resonant intracavity light intensity on the order of 1 kW/cm(2), the spectrometer was used for observing a Lamb dip in a transition of carbon dioxide involving four vibrational quanta. Saturating such a weak transition at 160 W input power, OFFS-CRDS paves the way to Doppler-free molecular overtone spectroscopy for precision measurements of hyperfine structures and pressure shifts. (C) 2014 Optical Society of America

引用

页码：4695 / 4698

页数：4

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