Two-channel phase jitter inhibiting device and method for Raman laser system

A Raman laser and suppression device technology, which is applied in the directions of laser scattering effect, optics, nonlinear optics, etc., can solve the problems of limiting Raman laser phase noise performance and inability to eliminate laser phase noise, so as to reduce phase noise and improve Stability, the effect of suppressing phase jitter

Active Publication Date: 2017-12-12
BEIHANG UNIV
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Problems solved by technology

This method can achieve independent feedback control of high frequency and low frequency components at the same time, and has a good control effect. However, since this Raman laser scheme uses two lasers, it means that the phase noise of the laser cannot be eliminated, which limits the Raman laser. Further Improvements in Phase Noise Performance of Mann Lasers

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  • Two-channel phase jitter inhibiting device and method for Raman laser system

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Embodiment 1

[0038] The frequency-stabilized laser 1 is a laser with a saturated absorption frequency-stabilized optical path; in this embodiment, a DL-Pro tunable semiconductor laser from Toptica, Germany is used. The output wavelength is set to 780nm, the laser line width is 100kHz@50μs, the laser output power is 40mW, the power stability is ~0.1%@1h, and the frequency stability is ~10-11@1s.

[0039] The 1 / 2 wave plates 2, 4, 8 and 26 are quartz crystals with a thickness of ~0.5mm. The multi-stage 1 / 2 wave plate of Wuhan Youguang Technology Co., Ltd. used in this embodiment has a diameter of 25.4 mm.

[0040] Described polarization beam-splitting prism 3, 14 and 15 is the polarization beam-splitting prism that side length is 12.7mm, the laser light of horizontal polarization state is transmitted, the laser light of vertical polarization state is reflected, and the power ratio of transmission laser light and reflected laser light is by 1 / 2 Waveplate control. What this embodiment adopts...

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Abstract

The invention provides a two-channel phase jitter inhibiting device and a method for a Raman laser system. The device comprises a frequency stabilized laser, a 1 / 2 wave piece, a polarization splitting prism, a 45 degrees reflecting mirror, an electrooptical modulator, a Fabry-Perot interferometer, an acousto-optic modulator, a plano-convex lens, a 1 / 4 wave piece, a 0 degree reflecting mirror, a PZT, a polarizer, a pretreatment circuit, a control circuit based on FPGA, a D / A converter, a acousto-optic modulator driver, a PZT driver, an electrooptical modulator driver and a Fabry-Perot interferometer controller. The two-channel phase jitter inhibiting device and the method can realize the independent control of power and frequency of two lasers; a high-frequency feedback and a low-frequency feedback are utilized to inhibit the phase jitter of the Raman laser; compared with a single-channel phase feedback system, the requirement on the circuit system is reduced, and the stability of the phase feedback system is improved.

Description

technical field [0001] The invention relates to a phase jitter feedback control technology for a Raman laser system, in particular to a phase jitter suppression device and method based on an acousto-optic modulator and a piezoelectric ceramic dual-channel feedback control, respectively realizing high-frequency and low-frequency phase The effective suppression of jitter belongs to the field of quantum precision measurement. Background technique [0002] The (ultra)cold atoms based on laser cooling and trapping have the characteristics of low speed and easy manipulation, and their de Broglie wave wavelength is 3 to 4 orders of magnitude smaller than that of laser, so quantum interferometry technology can provide smaller measurement scales, This means that quantum sensing instruments made of cold atoms can obtain much higher precision and sensitivity than traditional optical sensors, and have great application prospects in the fields of precision measurement and verification of...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/03G02F1/11H01S3/30
CPCG02F1/0305G02F1/0311G02F1/116H01S3/30
Inventor 潘雄徐小斌路想想宋凝芳李玮
Owner BEIHANG UNIV
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