Optical fiber laser intensity noise inhibition device and inhibition method

Abstract

The invention discloses a wide frequency band intensity noise inhibition device and inhibition method of an optical fiber laser. The device is composed of an optical fiber laser, a reflection type semiconductor optical amplifier, a semiconductor optical amplifier controller, an optical fiber conical lens, a semiconductor laser, a driving current source, a photoelectric detector and a frequency spectrum analyzer. Through the combination of the gain saturation effect of the large bandwidth of the semiconductor optical amplifier and the frequency stabilization effect of a laser resonant cavity, the intensity noise of the optical fiber laser can be inhibited in large amplitude in the wide frequency band range while maintaining the narrow line-width of the optical fiber laser.

Description

technical field [0001] The invention relates to a fiber laser, in particular to a fiber laser intensity noise suppression device and suppression method. The device can be applied to optical fiber sensing, lidar, high-resolution laser spectroscopy and other fields. Background technique [0002] In recent years, fiber laser technology has developed rapidly, the performance of fiber laser has been continuously improved, and its application has become more and more extensive. Due to the advantages of small size, narrow linewidth, and convenient use, fiber lasers are widely used in fiber optic sensing, lidar, and high-resolution laser spectroscopy. These applications place high demands on the noise characteristics of the laser. [0003] On the basis of proper packaging and temperature control, the general fiber laser can effectively suppress its frequency noise; but due to the relaxation oscillation effect of the laser and the fluctuation of the power of the pump source laser, ...

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Problems solved by technology

[0006] 1. Since the feedback is completed by electrical signals, the response of electrical signals is much slower than that of optical signals, so the fiber laser intensity noise in the high frequency band cannot be suppressed

[0007] 2. Requires complex feedback circuits and various servo feedback electrical components

This method introduces a semiconductor optical amplifier at the output end of the fiber laser, and uses the gain saturation of the semiconductor optical amplifier to stabilize the output power of the laser and suppress the intensity noise of the laser. The advantage of this method is that its intensity feedback is modulated by the optical The method is not the electrical method, and the response is fast, the bandwidth is high, and the intensity noise of the fiber laser can be suppressed in a wide bandwidth range. The disadvantage is that due to the high noise figure of the semiconductor optical amplifier itself, while suppressing the intensity noise. The system introduces additional frequency noise, which cannot meet the requirements of scientific research for fiber lasers with low frequency noise and low intensity noise

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