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Femtosecond laser ranging device and method for active dispersion compensation

A technology of femtosecond laser and dispersion compensation, which is applied in the field of femtosecond laser ranging, can solve the problems of complex operation and large size, and achieve the effect of flexible operation, small size and wide engineering application prospects

Active Publication Date: 2013-02-27
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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Problems solved by technology

S-W Kim, a scholar at the Korea Advanced Institute of Science and Technology, proposed an air dispersion compensation scheme using a series of single-mode optical fibers and prism pairs, but the scheme is complex in operation and large in size, and has certain limitations in engineering applications

Method used

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  • Femtosecond laser ranging device and method for active dispersion compensation
  • Femtosecond laser ranging device and method for active dispersion compensation
  • Femtosecond laser ranging device and method for active dispersion compensation

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Embodiment

[0052] The required high-efficiency transmission quartz grating is manufactured by using the micro-electronic etching process based on micro-nano optical technology. The duty ratio of the two gratings is f=0.5, which is convenient for manufacture and improves the manufacturing quality of the grating. The period of the grating is 500nm-1000nm, and when the period of the grating is small, the grating pair can achieve greater air dispersion compensation within a smaller adjustment range.

[0053] Such as figure 1 As shown, firstly, after the femtosecond laser passing through the measurement arm is affected by air dispersion, it broadens in the time domain and carries chirp in the frequency, and introduces it into the pulse width and phase measurement device. According to the femtosecond laser pulse electric field and The theoretical calculation of phase reconstruction can obtain the time domain change of femtosecond laser pulse, because the pulse width plays a key role in femtos...

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Abstract

The invention relates to the field of femtosecond laser ranging, in particular to a femtosecond laser ranging device and a femtosecond laser ranging method for active dispersion compensation. The device comprises a femtosecond laser frequency comb (FLFC), a laser isolation part ISO, a femtosecond laser beam-expanding collimation part, a Michelson ranging device part, a femtosecond laser pulse width and phase measurement part (FROG) and a data acquiring and processing part. The device is small in size and flexible to operate and has wide engineering application prospects.

Description

technical field [0001] The invention relates to the field of femtosecond laser ranging, in particular to a femtosecond laser ranging device and method for active dispersion compensation. Background technique [0002] With the advantages of monochromaticity, good coherence and strong directionality, laser plays an important role in precision displacement measurement involving large-scale processing measurement, earth topography mapping, space remote sensing detection and precise positioning between satellites. The usual laser ranging method is divided into two types: interferometry and non-interferometry. The non-interferometry converts the time-of-flight signal transmitted by the laser into the distance of the target to be measured, which is suitable for the application of absolute distance measurement, but the measurement of this method Accuracy and resolution are limited by the response time of the electronics. The traditional interferometry method uses phase accumulation...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C3/00G01C3/02
Inventor 武腾飞梁志国朱振宇李新良严家骅张大鹏
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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