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Multi-channel laser sideband frequency stabilization system

A multi-channel, laser technology, applied in the field of laser, can solve the problem of large difference between the resonant frequency of laser frequency and so on

Pending Publication Date: 2021-03-16
INST OF IND TECH GUANGZHOU & CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in actual situations, the laser frequency required for the experiment is quite different from the resonant frequency of the optical cavity, and it is necessary to adjust the laser frequency to the resonant frequency externally through various complex frequency shifting devices

Method used

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  • Multi-channel laser sideband frequency stabilization system
  • Multi-channel laser sideband frequency stabilization system
  • Multi-channel laser sideband frequency stabilization system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Such as Figure 1-3 As shown, the multi-channel laser sideband frequency stabilization system based on the PDH method includes a vacuum chamber 1, and also includes such as image 3 A series of optical paths in , and corresponding frequency-locked electronic devices.

[0046] The first window interface A, the second window interface B, the third window interface C, the fourth window interface D, the fifth window interface E, and the sixth window interface F are evenly distributed along the circumference of the vacuum chamber 1 , the seventh window interface G and the eighth window interface H (respectively marked as A, B, C, D, E, F, G, H, in figure 2 distributed counterclockwise along the circumference), the center points of the first window interface to the eighth window interface are located on the same distribution circle, and the top surface of the vacuum chamber 1 is provided with a first CF40 interface 2 and a second CF40 interface 3 .

[0047] The first windo...

Embodiment 2

[0058] Using the multi-channel laser sideband frequency stabilization system based on the PDH method described in Example 1, the method for locking the 854nm laser is as follows:

[0059] Step 1. The laser with a wavelength of 854nm passes through the Faraday isolator, λ / 2 wave plate HWP1, and polarization beam splitter PBS1 to select horizontally polarized light, and then passes through the beam splitter BS1, λ / 4 wave plate QWP1, λ / 2 wave plate HWP2, Lens L1, single mode polarization maintaining fiber PMF, λ / 4 wave plate QWP2, Glan Taylor prism GTP;

[0060] Step 2, the laser light passes through the fiber-coupled continuous electro-optic modulator EOM (French Ixblue company), because the difference between the required locked laser frequency f and the laser frequency ω matched by the ultrastable cavity is greater than 100MHz, in this scheme, select and The laser frequency ω=350.86565THz matched by the superstable cavity, the required locking frequency is f=350.86298THz, and ...

Embodiment 3

[0068] Using the PDH method-based multi-channel laser sideband frequency stabilization device described in Example 1, the method for locking the 397nm laser is as follows:

[0069] Step 1. The laser with a wavelength of 397nm passes through the Faraday isolator IOS, the λ / 2 wave plate HWP1, and the polarization beam splitter PBS1, and then selects horizontally polarized light, and then passes through the beam splitter BS1, the λ / 4 wave plate QWP1, and the λ / 2 wave plate in turn HWP2, lens L1, single-mode polarization-maintaining fiber PMF, λ / 4 wave plate QWP2, Glan Taylor prism GTP;

[0070] Step 2. Due to the limitation of the wavelength and the electronic driver of the EOM, the EOMs below 500nm are of the spatial type. In this solution, the spatial resonance type electro-optic modulator EOM (Qubig, Germany) is selected. The laser passes through the spatial resonant electro-optic modulator EOM, and the laser frequency ω=755.223820THz matching the ultrastable cavity is selecte...

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Abstract

The invention discloses a multi-channel laser sideband frequency stabilization system, which comprises: a vacuum chamber with an ultra-stable cavity inside; an electro-optical modulator used for receiving a frequency shift signal to modulate laser frequency so as to make the sideband frequency and the ultra-stable cavity resonate, and also used for receiving a PDH modulation signal and carrying out phase modulation on laser; and a PID-based digital circuit module controller used for receiving a modulated and transferred dispersion signal so as to adjust the driving signal of a laser device according to the deviation between the signal information and a set value and suppress the frequency fluctuation of the laser device. According to the invention, a frequency shift signal is applied to anelectro-optical modulator to modulate laser frequency, so that the sideband frequency and the optical cavity resonate; then a PDH modulation signal is applied to the electro-optical modulator, and phase modulation is performed on laser; and error signals obtained by a photoelectric detector are fed back to a servo system of a laser device to restrain frequency fluctuation of the laser device andenable the laser device to be locked on the optical cavity, so that narrow laser line width, tunable laser frequency and long-time stable frequency can be achieved.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a multi-channel laser sideband frequency stabilization system. Background technique [0002] In the 1960s, the invention of laser created a new situation for spectroscopy research. The application fields of laser are more and more extensive. In many application fields of laser, laser frequency stability is an extremely important index parameter. Therefore, laser frequency stabilization technology has become an important direction of basic scientific research and is playing an increasingly important role in modern science and technology. [0003] The introduction of quantum mechanics in the 20th century led to a revolution in technology. Cold atomic molecules and ion systems are ideal systems for studying quantum information and quantum precision measurement technology. Quantum manipulation requires multiple laser beams with high frequency stability, extremely low noise, and narro...

Claims

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Application Information

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IPC IPC(8): H01S3/137H01S3/107
CPCH01S3/137H01S3/107
Inventor 李加冲周飞章嘉伟冯芒
Owner INST OF IND TECH GUANGZHOU & CHINESE ACADEMY OF SCI
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