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Laser intensity noise suppression device for Nd:YVO4 laser

A technology of noise suppression and laser intensity, applied in the field of lasers, can solve problems such as difficult intensity noise suppression, achieve fast response speed, increase modulation bandwidth, and good suppression effect

Active Publication Date: 2021-09-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The photoelectric feedback method is to convert a part of the output laser light into a current using a photodiode, and then input it to the input current of the semiconductor laser (pump source) through a driving circuit. The AC part of the feedback signal is coupled to the semiconductor laser without affecting the DC drive current of the semiconductor laser, and the laser intensity noise is suppressed by feedback modulating the drive current of the semiconductor laser; however, the entire feedback loop needs to have a relatively large gain. It is necessary to realize appropriate phase lead compensation near the relaxation oscillation peak to the high frequency region to prevent the feedback loop from self-oscillation, and the gain of this negative feedback modulation is limited by the bandwidth of the pump laser, and it is difficult to obtain a wide range Intensity Noise Suppression

Method used

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  • Laser intensity noise suppression device for Nd:YVO4 laser
  • Laser intensity noise suppression device for Nd:YVO4 laser
  • Laser intensity noise suppression device for Nd:YVO4 laser

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Embodiment Construction

[0016] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0017] This embodiment provides a kind of for Nd:YVO 4 The laser intensity noise suppression device for intracavity modulation of the laser, the overall structure is as follows figure 1 As shown, including: pump source 1, coupling fiber 2, coupling lens 4, rear cavity mirror 6, Nd:YVO 4 Laser crystal 8, electro-optic crystal 10, first 1 / 2 wave plate 13, first polarizing beam splitter 14, second 1 / 2 wave plate 15, second polarizing beam splitting mirror 16, first focusing lens 17, first photodetector Device 18, signal processing module 19, second focusing lens 20, second photodetector 21, amplifier 22, spectrum analyzer 23;

[0018] Among them, pump source 1, coupling fiber 2, coupling lens 4, rear cavity mirror 6, Nd:YVO 4 Laser crystal 8 and electro-optic crystal 10 jointly constitute Nd:YVO 4 Laser; first 1 / 2 wave plate 13, first polariz...

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Abstract

The invention belongs to the technical field of lasers, relates to a laser intensity noise suppression technology, and particularly provides a laser intensity noise suppression device for an Nd:YVO4 laser. The device provides feedback signals and applies feedback signals to the two ends of an electro-optical crystal of the Nd:YVO4 laser, voltage applied to the electro-optical crystal is effectively adjusted, the transmissivity of the electro-optical crystal is further adjusted, the loss of a laser resonant cavity is further adjusted, and the intensity of laser output by the laser is adjusted. Through the electro-optical modulation, the intensity modulation of the laser output by the laser is realized, so that the laser intensity noise is suppressed, and the problem that the gain adjustment is limited by the bandwidth of an LD pump laser in the prior art is effectively solved. In conclusion, the response speed of electro-optical modulation is high, broadband feedback control can be formed, the suppression effect of laser intensity noise can be improved, and the modulation bandwidth is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of lasers, relates to laser intensity noise suppression technology, and specifically provides a method for Nd:YVO 4 Laser intensity noise suppression device for intracavity modulation of lasers. Background technique [0002] Semiconductor lasers have the advantages of tunability, compact structure, and good coherence, and have a wide range of application scenarios; however, the intensity noise of semiconductor lasers is relatively strong, resulting in unstable output power of the laser. Intensity noise represents the fluctuation of the output laser light intensity, which can be represented by the optical power per unit area. At present, there are many methods to suppress intensity noise, mainly including injection locking, photoelectric feedback, mode cleaner, etc.; such as the literature "BelfiJ, Galli I, Giusfredi G, et al. the phase-noise-to-amplitude-noise conversion [J]. Journal of the Optical Society...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/107H01S3/16
CPCH01S3/107H01S3/1673H01S3/1611
Inventor 王云祥霍猛史双瑾苏君范志强邱琪
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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