A measuring method of wavelength variation of a tunable laser

A technology for tuning lasers and wavelength changes, which is applied in the field of devices for measuring the wavelength changes of tunable lasers, can solve problems such as high cost, high system stability requirements, and complex structural devices, and achieve low cost, strong portability, and The effect of high measurement accuracy

Inactive Publication Date: 2011-09-14
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

These methods have higher requirements on the stability of the system, and the structural devices are more complicated and costly.

Method used

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  • A measuring method of wavelength variation of a tunable laser
  • A measuring method of wavelength variation of a tunable laser
  • A measuring method of wavelength variation of a tunable laser

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Embodiment Construction

[0029] Attached below figure 1 The system describes the method of measuring the wavelength variation of the tunable laser of the present invention.

[0030] Light source 1 is a tunable pulsed mid- and far-infrared quantum cascade laser to be tested, and its output wavelength can be tuned in a band of 1022.9 cm -1 ~1028.4cm -1 , the spatial filtering and telescope system 2 consists of two lenses and a pinhole for shaping the incident beam into a mode-matched optical resonator; two plano-concave high-reflection mirrors 3, 4 are concavely reflected within the laser output wavelength tuning range The ratio is greater than 99%, the optical resonant cavity is a stable cavity or confocal cavity, and the length L of the optical resonant cavity satisfies 0-24 cm -1 / molecule cm -2order of magnitude absorption line, nitrogen has no absorption line in the tuning band range of light source 1, so the mixed gas of carbon dioxide and nitrogen can be selected as the gas filled in the optic...

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Abstract

The invention discloses a measuring method of wavelength variation of a tunable laser. The measuring method comprises the steps of: (1) according to the technical principle of cavity ring down spectroscopy, after an output beam of a to-be-measured laser enters into a stable optical resonant cavity, filling gas which has at least two absorption lines in a wavelength tuning range of the to-be-measured laser into the optical resonant cavity, and tuning output wavelength of the laser through a wavelength controller to make the output beam sweeping over the two integrate gas absorption lines; recording cavity ring down signals in different output of the wavelength controller, and accordingly obtaining a curve of ring down time under different output of the wavelength controller; and comparing the curve with an absorption line of the gas filled into the optical resonant cavity, so as to obtain the relationship between the wavelength controller variation and the output wavelength variation. In the invention, a new method for measuring wavelength variation of a tunable laser is provided. The method in the invention can be applied to various tunable lasers (from ultraviolet lasers to middle far infrared lasers) for measurement. The method has advantages of simple procedure, strong systematic portability and so on.

Description

technical field [0001] The invention relates to a device for measuring the wavelength variation of a tunable laser, in particular to a method for measuring the relationship between the wavelength controller variation and the laser wavelength variation. Background technique [0002] With the development of laser technology, tunable lasers have very important applications in many fields such as biomedicine, environmental detection, optical communication, and high-precision spectral analysis. For example, tunable semiconductor laser absorption spectroscopy (TDLAS) is more and more widely used in the analysis of harmful substances in smoke, chemical spectrum analysis, and food safety inspection, and its measurement accuracy is directly limited by the tuning variation of the laser wavelength. Therefore, the measurement of the laser wavelength variation is a very meaningful work. [0003] At present, the calibration of the relationship between the output wavelength controller var...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J9/00
Inventor 曲哲超李斌成韩艳玲
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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