Semiconductor mode-locked laser and mode-locked laser tuning setting method

Abstract

The invention discloses a semiconductor mode-locked laser. The semiconductor mode-locked laser comprises a first reflector and a second reflector which are oppositely arranged; a saturable absorber which is arranged on one side of the first reflector; a semiconductor gain medium which is arranged on one side, far away from the first reflector, of the saturable absorber; a time delay modulator which is arranged on one side, far away from the saturable absorber, of the semiconductor gain medium; and a second reflector which is arranged on one side, far away from the semiconductor gain medium, ofthe time delay modulator. The invention also discloses a tuning method of the semiconductor laser. According to the semiconductor mode-locked laser and the tuning method provided by the invention, the effective optical path in the cavity can be changed under the condition that the normal work of the mode-locked laser is not influenced, so that the ultra-narrow optical pulse with continuously tunable repetition frequency can be output.

Description

technical field [0001] The invention relates to the field of semiconductor lasers, in particular to a semiconductor mode-locked laser and a method for tuning and setting the mode-locked laser. Background technique [0002] Semiconductor mode-locking laser (also known as pulsed laser) refers to the multi-longitudinal mode with random initial phase relationship in the laser cavity, which is adjusted to have a fixed phase difference through technical means, and finally realizes the output ultra-narrow pulse width , High-intensity time-sequenced optical pulses, which behave as optical frequency combs with fixed mode intervals in the frequency domain. At present, lasers have a wide range of applications and application prospects. For example, they play an important role in clock recovery in high-speed optical communications, millimeter wave / terahertz signal generation, microwave signal processing, and biomedical imaging. [0003] In the technical solution of the existing laser, ...

AI Technical Summary

Problems solved by technology

[0003] In the technical scheme of the existing laser, the effective optical path of the laser oscillator cavity is a fixed value, resulting in a fixed value of the repetition rate of the laser

This technical shortcoming limits the application of lasers in many scenarios. For example, in the specific application of microwave signal sources based on coupled optoelectronic oscillations, the non-adjustable repetition frequency causes the signal source to only generate microwave signals with a single frequency; In the characteristic optical frequency comb, the interval of the comb is a fixed value, so that the frequency interval can only be doubled or doubled, and the continuously adjustable performance cannot be achieved.

In addition, in the specific application that requires precise pulse repetition frequency, due to the process error in the design and production of semiconductor devices, it is impossible to accurately control the pulse repetition frequency to meet the design requirements.

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