Acoustic optical modulator-based high-stability laser frequency scanning device

An acousto-optic modulator and frequency scanning technology, applied in the field of laser spectroscopy, can solve problems affecting spectral accuracy and stability, and achieve the effects of flexible stability, high spatial stability and power stability

Active Publication Date: 2014-04-23
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when using this method, it will be accompanied by fluctuations in laser power and changes in the propagation direction of the laser beam, which will seriously affect the accuracy and stability of the spectrum.

Method used

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  • Acoustic optical modulator-based high-stability laser frequency scanning device
  • Acoustic optical modulator-based high-stability laser frequency scanning device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Laser double-pass acousto-optic modulation

[0027] see figure 1, a 689nm parallel laser beam with a stable frequency and a polarization direction parallel to the paper surface (horizontal), passes through the centers of aperture 1 and aperture 2 in sequence, and the laser beam propagates along the optical path fixed by the system. Since the incident light is horizontally polarized, the laser light passes through the polarization beam splitter prism 1 . After the horizontally polarized light passes through the quarter-wave plate 1, it becomes circularly polarized light. The parallel light beam passes through the aperture center of the diaphragm 3 and is focused by the lens L1. The focal point of the lens L1 is located at the crystal center in the AOM 1 and diffracted in the AOM 1. The angle of the acousto-optic modulator 1 is adjusted so that the diffraction efficiency of the negative first-order diffracted light reaches more than 80%. Adjust the position of the a...

Embodiment 2

[0043] In this embodiment, the positive first-order diffracted light of the AOM 1 is used.

[0044] see figure 1 , a 689nm parallel laser beam with a stable frequency and a polarization direction parallel to the paper surface (horizontal), passes through the centers of aperture 1 and aperture 2 in sequence, and the laser beam propagates along the optical path fixed by the system. Since the incident light is horizontally polarized, the laser light passes through the polarization beam splitter prism 1 . After the horizontally polarized light passes through the quarter-wave plate 1, it becomes circularly polarized light. The parallel light beam passes through the aperture center of the diaphragm 3 and is focused by the lens L1. The focal point of the lens L1 is located at the crystal center in the AOM 1 and diffracted in the AOM 1. The angle of the acousto-optic modulator 1 is adjusted so that the diffraction efficiency of the positive first-order diffracted light reaches more ...

Embodiment 3

[0047] In this embodiment, the positive first-order diffracted light of the acousto-optic modulator 2 is used, and Step 1, Step 2, and Step 3 are the same as Embodiment 1.

[0048] see figure 1 , similar to the primary stabilization of the laser power, the RF signal source 2, the voltage-controlled attenuator 2, the power amplifier 2, the acousto-optic modulator 2, the flat glass plate 2, the photodetector 2 and the servo controller 2 form another power stabilization The closed loop of , its working principle is similar to the primary stabilization of laser power. The lens 3 and the lens 4 are two lenses with the same focal length, and the two lenses are confocal, and the center of the AOM 2 is located on the focal point. Let only the positive first-order diffraction order pass through the aperture 5, and no longer scan the laser frequency. The frequency value of the RF signal source 2 is a fixed value, such as 100MHz, the laser frequency will increase by 100MHz, and the powe...

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Abstract

The invention provides an acoustic optical modulator-based high-stability laser frequency scanning device. Laser passes through two coaxial diaphragms and is divided into two paths by a polarization beam splitter prism; one path of output passes through a quarter-wave plate, a No. 3 diaphragm and a No. 1 lens which are coaxial with one another, and enters a No. 1 acoustic optical modulator; diffraction-order laser light passes through a No. 4 diaphragm and a No. 2 lens which are coaxial with each other, and is reflected by a zero-degree high reflective mirror along an original path; the other path of output passes through two 45-degree planar reflecting mirrors and is regulated into parallel light through an optical fiber of which the two ends are matched with optical fiber matching heads, and the parallel light enters a No. 2 acoustic optical modulator through a No. 1 glass flat plate and a No. 3 lens in sequence; diffracted light enters a No. 2 glass flat plate through a No. 5 diaphragm and a No. 4 lens. By adopting the device, the spatial stability and power stability of laser light can be ensured at the same time.

Description

technical field [0001] The invention belongs to the technical field of laser spectroscopy, and in particular relates to a laser frequency scanning device. Background technique [0002] Acousto-optic modulators are often used in modern spectroscopy to achieve high-precision frequency shifting of lasers. Because of this, acousto-optic modulators have been widely used in fields involving laser frequency control, such as laser spectroscopy, quantum optics, and quantum frequency standards. [0003] In high-precision spectroscopy, the frequency of the laser is generally locked to a fixed frequency reference, so its frequency cannot be swept. In this case, an AOM is usually used to scan the laser frequency by scanning the frequency of the RF signal input to the AOM, using phonon and photon interactions to scan the laser frequency . However, the use of this method will be accompanied by fluctuations in laser power and changes in the propagation direction of the laser beam, which ...

Claims

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Application Information

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IPC IPC(8): H01S3/13G02F1/11
Inventor 刘辉许朋任洁常宏
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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