Fabry-Perot cavity based non-modulating 2 mu m laser frequency stabilizing method and device thereof

A Perot cavity and laser technology, applied in the field of laser applications, can solve the problems of high price, small modulation depth and poor modulation effect of 2μm electro-optic phase modulator, and achieve good frequency stabilization effect of 2μm laser, reliable operation and low cost. Effect

Inactive Publication Date: 2010-12-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

The main disadvantage of the sideband modulation frequency stabilization method based on Fabry-Perot cavity is that the 2μm electro-optical phase modulator is expensive, the modulation effect is poor near th

Method used

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  • Fabry-Perot cavity based non-modulating 2 mu m laser frequency stabilizing method and device thereof
  • Fabry-Perot cavity based non-modulating 2 mu m laser frequency stabilizing method and device thereof

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Embodiment Construction

[0012] As shown in Fig. 1, the device of the present invention is composed of a laser light path (thick solid line part) and a control circuit (thin solid line part). The device of the present invention comprises a 2 μm monolithic non-planar ring cavity laser (1), an optical isolator (2), a first polarizing beam splitting prism (3), a second polarizing beam splitting prism (5), and a 1 / 2 wave plate (4) , the first mirror (6), the second mirror (7), the third mirror (8), the confocal Fabry-Perot cavity (9), the first photodetector (10), the second photoelectric A detector (11), a P-I control circuit (12), a driving voltage device (13), a piezoelectric ceramic (14) and a pumped LD laser (15).

[0013] The piezoelectric ceramic (14) is adhered to one surface of the 2 μm monolithic non-planar ring cavity laser (1), and the beam output by the 2 μm monolithic non-planar ring cavity laser (1) is a single-frequency beam with a wavelength of 2 μm; / 2 wave plate (4), simultaneously wit...

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Abstract

The invention provides a Fabry-Perot cavity based non-modulating 2 mu m laser frequency stabilizing method and a device thereof. The device consists of a 2 mu m monolithic semi-nonplanar ring oscillator, an opto-isolator, a polarization splitting prism, a 1/2 wave plate, a reflector, a confocal Fabry-Perot-type cavity, a photoelectric detector, a P-I control circuit, a drive adapter, piezoelectric ceramics and an LD pumping source. Due to the fact that a confocal Fabry-Perot cavity has different transmissivities to two 2 mu m lasers in different frequencies, generates current difference after photoelectric conversion, fluctuation of laser frequency ensures the current difference can be amplified, and after the P-I control circuit amplifies the current difference signal, the P-I control circuit outputs a feedback control signal, controls the drive adapter and pressurizes a cavity lens of a laser, the device ensures that the laser frequency can regress to achieve the effect of frequency stabilization. The method and the device have application value in the fields of laser radar, laser measurement standard and the like.

Description

technical field [0001] The invention relates to a non-modulated 2μm laser frequency stabilization method and device based on a Fabry-Perot cavity, and belongs to the technical field of laser applications. Background technique [0002] 2μm is located in the atmospheric transmission window and is in the safe band for human eyes. It is the lidar to detect air pollution and measure CO in the air. 2 , the content of water vapor molecules and the important wavelengths for measuring wind speed. The laser frequency stability of laser radar is an important technical index, which directly affects the accuracy of measurement. Doppler coherent wind measurement laser radar with laser frequency stabilization technology will greatly improve its measurement accuracy. At present, the main method used for 2μm laser frequency stabilization is the sideband modulation frequency stabilization method (PDH) which uses the transmission line of the Fabry-Perot cavity (F-P cavity) as a reference to s...

Claims

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Application Information

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IPC IPC(8): H01S3/139H01S3/083
Inventor 高春清左文郑岩高明伟张云山
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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