Waveband-tunable broadband optical isolator and tunable laser

Abstract

The invention provides a waveband-tunable broadband optical isolator, and belongs to the technical field of optics. The waveband-tunable broadband optical isolator is formed by sequentially arranging a first collimator, a first analyzing crystal, a tunable half-wave plate assembly, a tunable magneto-optic crystal assembly, a second analyzing crystal and a second collimator in the optical path transmission direction. The first analyzing crystal, the second analyzing crystal, the tunable half-wave plate assembly and the tunable magneto-optic crystal assembly are arranged in an outer seal piece. The first collimator and the second collimator extend into the two ends of the outer seal piece respectively. The tunable half-wave plate assembly includes at least two half-wave plates with different working wavebands. The tunable magneto-optic crystal assembly includes a magnetic ring and a movable magneto-optic crystal sleeved with the magnetic ring. By the cooperation between the waveband-tunable half-wave plate assembly and the movable magneto-optic crystal, high-isolation and low-loss transmission of light of different wavebands is achieved, transmission of forward light is guaranteed, the optimal isolation requirement of reverse light is met, and long-term and stable work of a tunable laser system is ensured.

Description

technical field [0001] The invention belongs to the field of optical technology, in particular to a broadband optical isolator with adjustable wavelength band and a tuneable laser. Background technique [0002] In the laser system, the light will be reflected in different degrees at the optical interface during the transmission process. These reflected lights will have a negative impact on the front-end devices such as the light source and optical amplifier, and then affect the normal operation of the entire system. In order to better eliminate the influence of light caused by reverse transmission and ensure the stable operation of the system, it is necessary to isolate the reverse light, which requires an optical isolator (optical isolation device is a non-reciprocal device). In the tunable laser system, when tuning from a certain wavelength band to other wavelength bands, due to the influence of the single working band of the isolator, the optical energy transmitted in th...

AI Technical Summary

Problems solved by technology

In the tunable laser system, when tuning from a certain wavelength band to other wavelength bands, due to the influence of the single working band of the isolator, the optical energy transmitted in the forward direction is greatly lost, and the optical energy transmitted in the reverse direction is greatly lost. If it cannot be eliminated well, it will have a serious impact on the system, for example: the reverse light causes the system to be unstable or even burn out and other abnormal phenomena, the forward light is weakened and affects the output power of the laser, etc.

Therefore, conventional optical isolators are not suitable for use in tunable laser systems

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