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Method and device for measuring frequency stability of single-frequency pulse laser

A technology of frequency stability and pulsed laser, which is applied in the field of optoelectronics and measurement, can solve problems such as the difficulty of distinguishing the influence of lasers and interferometers, and achieve the effect of high design difficulty, simple device structure, and high precision

Inactive Publication Date: 2014-12-10
NANJING MOVELASER TECH CO LTD
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Problems solved by technology

The usual practice is to use high-precision interferometers to measure and determine the frequency stability by observing the stability of the interference fringes. However, since the frequency of the research object itself is relatively stable, all that needs to be observed is the frequency jitter within a few MHz. To accurately measure such a small frequency jitter, very high requirements are placed on the resolution of the interferometer itself, the stability of the cavity length of the interferometer, and the measurement and analysis of interference fringes; in addition, under most experimental conditions, the Difficulty distinguishing the respective contributions of lasers and interferometers to frequency jitter

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  • Method and device for measuring frequency stability of single-frequency pulse laser

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Such as figure 1 As shown, a device for measuring the frequency stability of a single-frequency pulsed laser, including a light source to be tested 1, a reference light source 2, a half-wave plate 3, a Glan prism 4, 1064nmHR-45 degree reflector 5, 1064nm-45 degree Half mirror 6, half-wave plate 2 7, Glan prism 2 8, half-wave plate 3 9, photoelectric probe 10, data acquisition card 11 and computer 12.

[0025] The reference light source 2 adopts the planar ring cavity (NPRO) laser of Innolight Company, which has high stability. The instantaneous spectral linewidth of the output 1064nm single-frequency linearly polarized laser is on the order of KHz, and the frequency drift per minute is less than 1MHz. The long-term frequency The drift is less than 45MHz / 3h. The light source 1 to be tested is a linearly polarized single-frequency pulse laser inj...

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Abstract

The invention belongs to the technical field of optoelectronics and measurement, and particularly relates to a method and a device for measuring frequency stability of single-frequency pulse laser. The method includes taking a reference light source with high stability as a frequency standard, allowing the reference light source to generate certain frequency shift relative to a to-be-measured light beam, and beating with the to-be-measured light beam to acquire information of frequency stability of the to-be-measured single-frequency pulse laser according to frequency information of beat frequency signals. The device is simple in structure; the method utilizing the device has good real-time performance and high measurement precision, completes real-time measurement of frequency stability of the single-frequency pulse laser, and scientifically solves problems of high design difficulty in frequency stability measurement of the single-frequency pulse laser and high measurement error caused by shake of measuring systems.

Description

technical field [0001] The invention belongs to the field of optoelectronics and measurement technology, in particular to a method and device for measuring the frequency stability of a single-frequency pulsed laser. Background technique [0002] Doppler lidar not only requires the laser emission source to be a single-frequency output, but also requires the pulsed laser emission source to have high frequency stability. According to different wind measurement accuracy requirements, at least the frequency should be stable within a few MHz at a wavelength of 1064nm, so it is particularly important to accurately measure the frequency stability of pulsed lasers. The usual practice is to use high-precision interferometers to measure and determine the frequency stability by observing the stability of the interference fringes. However, since the frequency of the research object itself is relatively stable, all that needs to be observed is the frequency jitter within a few MHz. To ac...

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Application Information

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IPC IPC(8): G01J9/04G01S7/497
Inventor 周军郝丽云丁建永卢栋宋维尔刘迎春王国峰
Owner NANJING MOVELASER TECH CO LTD
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