Laser frequency stabilization device and method, semiconductor laser component using same

Abstract

A laser frequency stabilization device, comprising a semiconductor laser, an acousto-optic modulator, a Fabry-Perot cavity arranged in a vacuum device, a multi-channel radio frequency signal source, a combiner, a radio frequency amplifier, a photodetector and a mixer; Among them, the laser light emitted by the semiconductor laser to be stabilized will generate +1 order or -1 diffracted light after passing through the acousto-optic modulator for the first time, reflect back to the acousto-optic modulator, and generate +1+1 after the second diffraction order or -1-1 order diffracted light; the +1+1 order or -1-1 order diffracted light enters the Fabry-Perot cavity, and its signal is reflected on the photodetector to detect electrical signals and multi-channel radio frequency signals The demodulated signal of the source is mixed and processed by a mixer to obtain an error signal, and the error signal is fed back to the semiconductor laser to achieve frequency stabilization. In the invention, the laser passes through the acousto-optic modulator twice to expand the frequency adjustment range, and also enhances the stability of the laser power in the frequency scanning process.

Description

technical field [0001] The invention relates to the field of laser frequency stabilization, in particular to a laser frequency stabilization device and method. Background technique [0002] Semiconductor lasers are lasers with narrow linewidth, easy tuning, small size, low power consumption, and long life. They are widely used in various fields such as laser communication, atomic frequency standards, quantum information, and laser printing. Since the laser frequency is easily affected by temperature, current, and vibration, the frequency stability of semiconductor lasers is very important. [0003] Common frequency stabilization methods for semiconductor lasers include PDH technology using ultra-stable Fabry-Perot cavity and saturable absorption spectroscopy technology. Among them, the advantage of saturated absorption spectroscopy technology is that it is convenient, simple, and low in cost, but it has a strict limitation on the laser wavelength. PDH technology is named a...

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Problems solved by technology

There are several existing schemes using the AOM, including using a voltage-controlled oscillator to drive the AOM, modulating the light through the atomic vapor chamber, and obtaining the absorption spectrum signal. The disadvantage is that the atomic absorption spectrum method can only be used for specific wavelengths, and cannot It is universal; use a specially designed AOM working in the Raman-Nath diffraction area, combined with a confocal cavity to obtain the PDH error signal, the disadvantage is that the operating frequency of this AOM is very low, only tens of MHz, and the center frequency adjustment range is small. Moreover, the product is only suitable for a specific band, not universal

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