Intensity noise suppression device for single-frequency fiber laser with broadband near Schott noise limit

Abstract

The invention discloses a broadband single-frequency fiber laser intensity noise suppression device for achieving a nearly schottky noise limit. The broadband single-frequency fiber laser intensity noise suppression device comprises a single-frequency fiber laser resonator, a wavelength division multiplexer, a single-mode semiconductor pump light source, an optical fiber isolator, a polarization controller, a laser saturated amplification device, an optical fiber filter module, an optical fiber coupler, a photoelectric detector and a feedback control system. According to the broadband single-frequency fiber laser intensity noise suppression device disclosed by the invention, the broadband intensity noise of output laser can be reduced through the laser saturated amplification device; feedback control is carried out on the laser saturated amplification device, so that the intensity noise of the output laser can be further reduced; the frequency range of intensity noise suppression can be further expanded; and finally, the effects of keeping the intensity noise of a single-frequency laser within a broadband and simultaneously reducing the intensity noise close to schottky noise limit are achieved. The broadband single-frequency fiber laser intensity noise suppression device for achieving the nearly schottky noise limit has a broad application prospect and great application value in the fields of ultra-high precision and ultra-long distance laser ranging, optical fiber sensing, atomic and molecular spectroscopy and the like.

Description

Technical field [0001] The invention relates to the technical field of laser intensity noise suppression, in particular to a single-frequency fiber laser intensity noise suppression device with a wide frequency band near the Schott noise limit. Background technique [0002] Fiber laser refers to a laser that uses rare-earth-doped glass fiber as a gain medium. Under the action of the pump light, high power density is easily formed in the fiber, causing the laser energy level of the laser working material to be reversed. A resonant cavity can be formed by taking simple measures to form a laser output. Fiber laser has the advantages of low pumping threshold power, high conversion efficiency, multiple output laser wavelengths, wide tunable range, high coupling efficiency (fully compatible with existing optical fiber communication systems and optical fiber sensing systems), compact structure, and low cost. It has broad application prospects and great application value in high-speed a...

AI Technical Summary

Problems solved by technology

However, it is difficult to suppress technical noise in the low frequency band with only one laser saturation amplifier

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