Modulation-free frequency stabilizer of external cavity semiconductor laser

Abstract

A modulation-free frequency stabilizer of an external cavity semiconductor laser consists of a single frequency narrow-linewidth external-cavity semiconductor laser, a Faraday isolator, a first half-wave plate, a polarization beam splitter, a Sagnac ring, a differential detection circuit consisting of two photoelectric diode detectors, a subtraction circuit, a proportional-integral-differential processing circuit and a switch. The modulation-free frequency stabilizer has the advantages of simple structure, good frequency stabilization effect, low cost and the like.

Description

technical field [0001] The invention relates to a semiconductor laser, in particular to a non-modulation frequency stabilization device for an external cavity semiconductor laser. The device is mainly used in the fields of laser atom cooling, high-resolution laser spectrum, laser frequency standard, optical measurement and the like. Background technique [0002] In recent years, semiconductor laser technology has developed rapidly, the performance of semiconductor lasers has been continuously improved, and their applications have become more and more extensive. Due to its various advantages such as miniaturization and easy operation, most of the single-frequency narrow-linewidth lasers required in applications such as laser cooling, laser frequency standards, high-resolution laser spectroscopy, and high-precision interferometry currently use semiconductor lasers. Laser cooling and laser spectroscopy have high requirements on the linewidth and frequency stability of the laser...

AI Technical Summary

Problems solved by technology

[0010] The present invention proposes an external cavity semiconductor laser in order to solve the disadvantages of the above-mentioned prior art in the non-modulation frequency stabilization structure of the commonly used single-frequency narrow-linewidth external cavity semiconductor laser, which requires a strong magnetic field, a complex structure, and is sensitive to external influences. The non-modulation frequency stabilizing device has the characteristics of simple structure, good frequency stabilizing effect, and little influence from the outside world.

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