Laser cavity ring-down gas spectral measurement system based on femtosecond optical frequency combing

A spectral measurement and optical frequency comb technology, which is applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of frequency-stabilized laser cavity length changes, etc., and achieve high-precision, high-frequency, high-cavity ring-down spectral measurement effects

Active Publication Date: 2015-11-18
TSINGHUA UNIV
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Problems solved by technology

The disadvantage is that the frequency change of the frequency-stabilized laser will cause the cavity length to change

Method used

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  • Laser cavity ring-down gas spectral measurement system based on femtosecond optical frequency combing

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Embodiment Construction

[0022] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0023] The specific embodiment of the present invention is as figure 1 shown. In the drawing, the thin solid line indicates the electrical connection; the dotted line indicates the light emitted by the external cavity tunable semiconductor laser one 3, and the arrow indicates the direction of the light; the dotted line indicates the light emitted by the external cavity tunable semiconductor laser two 16, and the arrow indicates the direction of the light.

[0024] The present invention is a laser cavity ring-down gas spectrum measurement system based on a femtosecond optical frequency comb, including a cavity ring-down spectrum measurement system, a laser frequency stabilization system and a cavity length stabilization system, wherein:

[0025] The cavity ring-down spectroscopy measurement system includes an external cavity tunable semiconducto...

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Abstract

The invention relates to a laser cavity ring-down gas spectral measurement system based on femtosecond optical frequency combing and belongs to the field of cavity ring-down gas spectral measurement. The system is composed of a cavity ring-down spectral measurement system, a measuring laser frequency stabilization system and a cavity length stabilization system. A femtosecond pulse laser serves as a frequency standard, measuring laser frequency and cavity length can be traceable to the time frequency standard, and accordingly high-precision cavity ring-down spectral measurement is achieved.

Description

technical field [0001] The invention belongs to the field of laser cavity ring-down gas spectrum measurement, in particular to a laser cavity ring-down gas spectrum measurement system based on a femtosecond optical frequency comb. Background technique [0002] Laser cavity ring-down spectroscopy has the advantages of not being affected by laser intensity fluctuations, long absorption path, and high sensitivity. Usually the cavity ring-down system consists of a high-precision passive cavity, a pulsed laser or a continuous wave tunable laser, as well as a photoelectric sensor and a control system. When the continuous laser light is injected into the high-precision optical passive cavity filled with gas, a detector is used at the other end to receive the transmitted light intensity of the cavity. When the transmitted light intensity reaches the set threshold, the incident light source is cut off, and the light in the cavity Reflecting back and forth inside, the gas will absorb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39
Inventor 蔡子航尉昊赟
Owner TSINGHUA UNIV
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