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Femtosecond laser frequency comb ranging device and method

A technology of femtosecond laser and distance measuring device, which is applied in the direction of measuring device, distance measurement, line-of-sight measurement, etc. It can solve the problems of unable to receive interference signals and affect measurement, so as to ensure accuracy and stability, easy adjustment, and simple design Effect

Inactive Publication Date: 2013-07-10
ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

Since the femtosecond laser frequency comb frequency mode and the number of detectable frequencies of the photodetector differ by 2 orders of magnitude, each pixel of the CCD will receive interference signals of many frequency modes, and it is impossible to receive a single signal on each pixel. Interfering signals in frequency mode seriously affect the measurement

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  • Femtosecond laser frequency comb ranging device and method
  • Femtosecond laser frequency comb ranging device and method
  • Femtosecond laser frequency comb ranging device and method

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Embodiment Construction

[0028] The inventor of this case considers designing an optical filter device for the femtosecond laser frequency comb ranging device, which optically filters the light from the femtosecond laser, greatly reduces the frequency mode density of the optical frequency comb, and makes each CCD linear array detector Each pixel can receive an interference signal of a single frequency mode, reducing the resolution load of the photodetector.

[0029] Femtosecond laser frequency combs contain hundreds of thousands to millions of frequency modes, and the frequency mode resolution of existing filtering devices cannot meet the requirements for frequency mode spacing in spectral interference ranging.

[0030] Fabry-Perot device (FP) is a commonly used optical interference instrument, and the traditional usage of FP is to produce optical interference effect. The inventor considers that Fabry-Perot devices can be used for equal-spaced and high-resolution filtering. Compared with existing filt...

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Abstract

The invention provides a femtosecond laser frequency comb ranging device and device. The device comprises a Fabry Perot device behind a Michelson interference optical path and in front of a spectrograph. The Fabry Perot device performs optical filtering on light of a femtosecond laser frequency comb, and reduces the frequency mode density of the optical frequency comb, so that each pixel of a CCD (charge coupled device) linear array detector of the spectrograph receives an interference signal in a single frequency mode. The device and the method achieve optical filtering of the femtosecond laser frequency comb within a broad spectrum range, and guarantee the accuracy and the stability of an interval and parallelism between optical plane reflection mirrors of the device; and the device is simple in design and structure, easy to regulate and low in cost.

Description

technical field [0001] The invention relates to a distance measuring device and method, in particular to a distance measuring device and method for large-scale and high-precision laser ranging by using a femtosecond laser frequency comb. Background technique [0002] Large-scale and high-precision laser ranging needs to solve two contradictions, one is to improve the measurement accuracy, and the other is to increase the range. Theoretically, the shorter the wavelength, the higher the measurement accuracy, and the longer the wavelength, the larger the range. Dual-frequency laser ranging uses a combination of two frequency modes for measurement, that is, a combination of a higher frequency measurement and a lower frequency measurement, to achieve sub-millimeter measurement accuracy within a range of tens of meters. [0003] The femtosecond laser frequency comb uses a femtosecond laser as the light source, which has the characteristics of wide spectrum and narrow pulse. The f...

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Application Information

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IPC IPC(8): G01C3/00G01C3/02
Inventor 周维虎劳达宝董登峰纪荣袆袁江张滋黎刘鑫许艳丁蕾黎尧
Owner ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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