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Residual amplitude modulation stabilization device based on wedge angle electro-optic crystal

An electro-optic crystal and amplitude modulation technology, applied in optics, circuits, lasers, etc., can solve problems such as reducing system reliability, not suitable for miniaturized applications, and increasing the complexity of measurement systems, achieving easy implementation, high stability, and device The effect of simple structure

Active Publication Date: 2016-05-11
WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, active control requires the addition of additional optical or electrical components to achieve feedback control. This method will inevitably increase the complexity of the entire measurement system, reduce the reliability of the system, and is not suitable for miniaturized applications.

Method used

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  • Residual amplitude modulation stabilization device based on wedge angle electro-optic crystal
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  • Residual amplitude modulation stabilization device based on wedge angle electro-optic crystal

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Embodiment Construction

[0040] Below in conjunction with accompanying drawing and embodiment this device is described in detail:

[0041] 1. The structure of the device

[0042] 1. Overall

[0043] Such as figure 1 , the device includes a light source and an optical path 00, an electro-optic phase modulation module 10 and a detection module 20;

[0044] The light source and optical path 00 include a laser 01, a polarizer 02, an analyzer 03 and a polarization beam splitter prism 04;

[0045] The electro-optic phase modulation module 10 includes a copper foil 11, an electro-optic crystal 12, a copper block 13, a thermoelectric cooling chip 14, a heat sink 15 and a signal source 16;

[0046] The detection module 20 includes a photodetector 21, a mixer 22, a phase shifter 23 and a digital multimeter 24;

[0047] Its location and connection relationship are:

[0048] Laser 01, polarizer 02, electro-optic crystal 12, analyzer 03 and polarization beam splitter 04 are arranged in sequence to form the op...

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Abstract

The invention discloses a residual amplitude modulation stabilization device based on a wedge angle electro-optic crystal, and relates to the technical field of laser frequency stabilization. According to the device, an optical path part is formed by a laser device, a polarizer, the electro-optic crystal, a polarization analyzer and a polarization splitting prism which are arranged in turn; an electro-optic phase modulation part is formed by a signal source, a copper foil, the electro-optic crystal, a copper block, a thermoelectric refrigeration piece and a heat sink which are connected in turn; the signal source, a phase shifter and the local end of a frequency mixer are connected in turn so as to acquire local oscillation signals required by demodulation; vertically polarized light of the polarization splitting prism, a photoelectric detector and the radio frequency end of the frequency mixer are connected in turn so as to acquire radio frequency signals; and the intermediate frequency end of the frequency mixer is connected with a digital universal meter so as to acquire residual amplitude modulation signals, wherein the electro-optic crystal is a lithium niobate crystal with a wedge angle, and an inclined angle of 75 degrees is formed between the light-transmitting surface and the optical axis direction. The device is simple in structure, high in stability and easy to realize and can be applied to the field of precision measurement of high-stability laser, laser interference, gravitational wave observation, laser spectroscopy and optical frequency standards.

Description

technical field [0001] The invention relates to the technical field of laser frequency stabilization, in particular to a residual amplitude modulation stabilization device based on a wedge-angle electro-optic crystal. Background technique [0002] Phase modulation and photodetection are the most commonly used high-sensitivity photodetection technologies in research and technical applications using high-stable laser precision measurements, such as spectroscopy, optical frequency standards, and gravitational wave observations. Electro-optic phase modulation is one of the most commonly used methods in phase modulation. Many physical effects and changes in environmental factors will inevitably produce residual amplitude modulation in the process of electro-optical phase modulation, which will affect the stability and accuracy of the measurement. For example, in frequency modulation spectroscopy, the residual amplitude modulation effect will cause spectral line distortion and re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/13G02F1/03
CPCG02F1/0305G02F1/0311H01S3/1306
Inventor 毕进李刘锋王佳陈李生
Owner WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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