Integrated reflective phase bias device, fiber laser and light wave and microwave phase detector

Abstract

The present invention discloses an integrated reflective phase bias device, a fiber laser and a light wave and microwave phase detector. The phase bias device comprises a fiber holder, a collimation lens, a polarizing prism, a Faraday rotator, a birefringent crystal and a mirror. According to the device, the fiber laser and the light wave and microwave phase detector, two polarization-maintaining fibers with mutually vertical directions are fixed in the fiber holder, the light with mutually vertical polarization directions are separated by the polarizing prism, only one collimator, one Faraday rotator, one birefringent crystal and one mirror are needed, the size is small, the stability is high, the price is low, and no any adjustment is needed. The phase bias device is used in the fiber laser, a self started mode-locked pulse train can be obtained, the characteristic of the pulse train is not interfered by an external environment, and the phase bias device can be applied to various complex environments with high noise, heavy pollution or emission. The phase bias device is used in the light wave and microwave phase detector, thus the light wave and microwave phase detector is compact and is not interfered by the outside, and the working is more reliable.

Description

technical field [0001] The invention relates to fiber laser technology, in particular to an integrated reflective phase offset device, a fiber laser and a light wave-microwave phase detector. Background technique [0002] Mode-locked fiber lasers have ultra-short pulses, definite repetition rates, and high peak power, and have irreplaceable application values ​​in scientific research and industrial processing. However, compared with ordinary lasers, mode-locked lasers are difficult to self-start, susceptible to external interference, and high in price, which hinders their application. [0003] There are three main modes-locking schemes in fiber lasers: nonlinear loop mirrors, saturable absorbers, and nonlinear polarization rotation. The 8-shaped mode-locked fiber laser composed of nonlinear loop mirrors is difficult to start in mode-locking, and often requires external push instead of polarization-maintaining fiber; the semiconductor saturable absorber in the saturable abso...

AI Technical Summary

Problems solved by technology

[0005] The optical-microwave phase detector in the paper "Subfemtosecond synchronization of microwave oscillators with mode-locked Er-fiber lasers" published by Jungwon Kim (Jin Zhengyuan) and others on Optics Letters utilizes an asymmetric phase shifter and uses it as a A phase shifter in a fiber optic ring, but composed of discrete spatial elements, and is transmissive, not reflective, requires two Faraday rotators, and there is no polarizing prism in the phase shifter

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