Frequency stabilizing device of semiconductor laser and adjusting method thereof

Abstract

The invention provides a frequency stabilizing device of a semiconductor laser and an adjusting method thereof. The frequency stabilizing device consists of the semiconductor layer, a quarter wave plate, an atomic absorption basin, a half-transparent and half-reflecting mirror, a photoelectric prober, an oscilloscope, an ordinary optical glass and a signal generator. According to the invention, based on the combination of an atomic saturated absorption spectroscopy technology and an incoherent feedback frequency stabilization technology, an output frequency of the semiconductor laser is stabilized at an atomic saturated absorption peak. Therefore, the narrow line width pressure and the stable frequency of the semiconductor laser can be realized simultaneously. The frequency stabilizing device has the characteristics of simple structure and high frequency stability.

Description

technical field [0001] The invention relates to a semiconductor laser, in particular to a semiconductor laser frequency stabilization device and an adjustment method thereof. The device can be applied to the fields of laser atom cooling, high-resolution laser spectrum, cold atomic clock 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 the advantages of small size, high efficiency, and convenient use, semiconductor lasers are widely used in many fields such as laser atom cooling, high-resolution laser spectroscopy, and cold atomic clocks. These application fields have high requirements on the linewidth and frequency stability of the laser, and the output frequency of the free-running semiconductor laser is very sensitive to the injection current and operating temperature, ev...

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Problems solved by technology

[0005] 1. Since the feedback is completed by electrical signals, the response of electrical signals is much slower than that of optical signals, so it is impossible to narrow the linewidth of semiconductor lasers while stabilizing their frequency

[0006] 2. Requires complex processing circuits such as lock-in amplification, and various modulation components, etc.

This device locks the frequency of the semiconductor laser on the unsaturated absorption peak of cesium atoms in the 852nm band by introducing incoherent optical feedback. Narrow line width, the disadvantage is that the width of the entire unsaturated absorption peak of the atom is very wide (1GHz), so the frequency stabilization and line width narrowing effect of this method are not ideal, and it cannot meet the requirements of high frequency stability in scientific research. Wide Diode Laser Requirements

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