Optical frequency comb device based on all polarization-maintaining fiber and mode locking and frequency locking method

Abstract

The invention relates to an optical frequency comb device based on an all polarization-maintaining fiber and a mode locking and frequency locking method. The generation of mode locking pulses is realized by nonlinear polarization rotation of the pulses in a spiral fiber. The repetition rate of the device is locked through a mechanical method or an optical method. Through an all polarization-maintaining fiber amplifier, a polarization-maintaining nonlinear fiber and a PPLN crystal, carrier phase zero frequency signals of the pulses are acquired; the carrier phase zero frequency signals are processed by a circuit and are then fed back to a power control device in the device or fed back to an intracavity loss control device, and locking of the carrier phase zero frequency signals is realized.Based on the all polarization-maintaining fiber, a mode-locked laser is built, the pulses generate nonlinear polarization rotation in the spiral fiber, and walk-off effects of the pulses are solved through special arrangement of multiple sections of spiral fibers. The made all polarization-maintaining fiber optical frequency comb device has the characteristics of extremely high stability and insensitivity to temperature fluctuation and mechanical vibration.

Description

technical field [0001] The invention relates to a laser technology, in particular to an optical frequency comb device and a mode-locking and frequency-locking method based on an all-polarization-maintaining optical fiber. Background technique [0002] Optical frequency combs have very important applications in precision spectrum measurement, time-frequency reference, and absolute distance measurement. Currently, the key component of optical frequency combs is the ultrashort-pulse laser oscillator. The pulse mode-locking principle of the ultrashort pulse laser oscillator, the optical path structure and other factors have a crucial influence on the performance of the optical comb. [0003] At present, optical frequency combs based on optical fiber structures have significant advantages in terms of stability and practicability compared with optical combs based on solid gain media, such as bendable waveguide structure optical paths, light weight and easy integration, and good h...

AI Technical Summary

Problems solved by technology

Polarized components cannot generate cross-phase modulation after walk-off

[0008] Second, pulse splitting occurs due to the walk-off of the polarization components on the fast and slow axes

Thermally induced birefringence can significantly affect the linear and nonlinear phase delay of the pulse on the fast and slow axes of the fiber, thereby affecting the stability of laser transmission

Images