Transmission cavity frequency stabilizing system and method for realizing long-term laser frequency stabilization

Abstract

The invention discloses a transmission cavity frequency stabilizing system and method for realizing long-term laser frequency stabilization and belongs to the field of precise laser frequency stabilization. The frequency stabilizing system mainly comprises a plurality of Ti-doped sapphire lasers, reference cavities, control boxes, a reference laser (helium-noon laser) with stable frequency, a polarization beam splitter, a Fabry-Perot transmission cavity, a photoelectric detector, a function signal generator, an adder, a data acquisition card, a computer and the like. The frequency stabilizing method comprises steps as follows: firstly, two Ti-doped sapphire lasers are locked on the respective reference cavities, and then the reference cavities are locked on the reference laser with stable frequency, so that two Ti-doped sapphire lasers with laser line width smaller than 100 kHz and long-term frequency drift smaller than plus/minus 1 MHz are obtained. The system and the method have the advantages that only one reference laser is used for locking the plurality of Ti-doped sapphire lasers with frequency to be stabilized simultaneously and can lock the Ti-doped sapphire lasers at any frequency within the tunable range, and the extensibility and the frequency stability are very high.

Description

technical field [0001] The invention belongs to laser frequency stabilization technology, and relates to a transmission cavity frequency stabilization system with long-term stable laser frequency and a frequency stabilization method thereof, which is applicable to laser physics, atomic and molecular optics, frequency standards, quantum information and other fields requiring long-term stable frequency lasers . Background technique [0002] Lasers with long-term frequency stability are very important in scientific experiments in many fields. There are various ways to achieve laser frequency stabilization, including reference cavity frequency locking technology, saturated absorption frequency stabilization technology, etc. Different frequency stabilization methods have their own advantages and disadvantages. For example, reference The cavity frequency locking method can narrow the linewidth, but it is difficult to overcome the long-term frequency drift. The saturated absorption...

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Problems solved by technology

[0005] The purpose of the present invention is to disclose a transmission cavity frequency stabilization system with long-term stable laser frequency and its frequency stabilization method to solve the problem that the traditional Ti:sapphire laser frequency stabilization technology cannot take into account the continuous tuning, long-term stability and line width of the laser frequency at the same time. narrow, and a set of frequency stabilization system can only lock one beam of laser, resulting in waste of space and high cost. It provides multiple beams with narrow linewidth and long-term frequency stability for the fields of laser physics, atomic and molecular optics, frequency standards, and quantum information. laser

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