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A compact high repetition rate fully polarization-maintaining fiber mode-locked laser

A high repetition frequency, mode-locked laser technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problems of difficulty in achieving high repetition frequency, high pump power consumption, and difficulty in increasing the repetition frequency. Achieve long-term stable operation and anti-interference ability, solve processing difficulties, reduce coupling difficulty and stability

Active Publication Date: 2022-05-03
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult for this polarization-maintaining fiber NALM mode-locking scheme to achieve a high repetition rate exceeding 250MHz, and this high-repetition-frequency laser faces difficulties in processing and manufacturing, high production costs, high pump power consumption requirements, and difficulty in mode-locking and repetition rate. difficult to improve

Method used

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  • A compact high repetition rate fully polarization-maintaining fiber mode-locked laser
  • A compact high repetition rate fully polarization-maintaining fiber mode-locked laser
  • A compact high repetition rate fully polarization-maintaining fiber mode-locked laser

Examples

Experimental program
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Effect test

Embodiment 1

[0024] figure 1 is a schematic diagram of the structure of the laser provided in Embodiment 1, such as figure 1 As shown, a compact high repetition rate fully polarization-maintaining fiber mode-locked laser includes a first polarization-maintaining single-mode fiber 1, a polarization-maintaining gain fiber 13, a second polarization-maintaining single-mode fiber 14, a pump source 15, a first Composite polarization-maintaining fiber collimator 2, first phase shifter unit 6, first polarization beam splitter 9, first 1 / 4 wave plate 10, second optical bandpass filter 11, electro-optic modulator 23, grating pair 24. Mirror 25 and piezoelectric ceramic 26; the first polarization-maintaining single-mode fiber 1 and the polarization-maintaining gain fiber 13 are connected through the fiber fusion splicing point 12, between the first polarization-maintaining single-mode fiber 1 and the polarization-maintaining gain fiber 13 Multiple sections of polarization-maintaining single-mode fib...

Embodiment 2

[0034] With respect to Embodiment 1, the first composite polarization-maintaining fiber collimator 2 and the first phase shifter unit 6 are replaced by a second composite polarization-maintaining fiber collimator 31, and the second composite polarization-maintaining fiber collimator 31 Add a second half-wave plate 36 between the first polarization beam splitter and the first polarization beam splitter 9; Phase unit 35; the second phase shifter unit 35 and beam splitter 29 can be between the polarization-maintaining fiber collimator 28 and the second polarization beam splitter 30, or between the polarization-maintaining fiber collimator for wavelength division multiplexing 27 and the second polarization beam splitter 30; the second half-wave plate 36 can be replaced by a direct rotation second composite polarization-maintaining fiber collimator 31 or the first polarization beam splitter 9, and can also be replaced by other types of wave plate combination structure or Faraday ro...

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Abstract

The invention discloses a compact high repetition frequency fully polarization-maintaining optical fiber mode-locked laser, which is based on a nonlinear magnifying ring mirror mode-locked method and has the characteristics of fixed mode-locking point and long-term stable operation. The use of the phase shifter unit and the wavelength division multiplexing polarization-maintaining fiber collimator reduces the requirement on the pump power, thereby reducing the damage to the optical device during long-term operation. Compared with the same type of short cavity length and high repetition rate polarization maintaining fiber laser, it can realize self-starting mode locking at a higher repetition rate. The single composite polarization-maintaining fiber collimator structure solves the problems of difficult processing and high cost of adjusting devices when using multiple collimators, and improves the reliability of the overall laser system and the yield rate of industrial mass production. Optical band-pass filters inside or outside the laser cavity can effectively compress the relative intensity noise of the output pulse. The use of the beam splitter in the compound polarization-maintaining fiber collimator enables the output pulse to have more optional characteristics such as noise, power, spectral width and contrast.

Description

technical field [0001] The invention relates to the field of ultrashort pulse lasers, in particular to high repetition frequency polarization-maintaining fiber mode-locked lasers. Background technique [0002] In the past two or three decades, the theory and experiment of mode-locked lasers have been greatly developed. The pulses generated by mode-locked lasers are applied to more and more scenarios, such as ultra-fine laser spectroscopy, timing and synchronization, two-photon spectroscopy, generation of terahertz radiation, research on attosecond dynamics, generation of pure microwaves, Ultra-precision machining of materials, etc. Early applications of femtosecond pulses were limited to well-controlled laboratory environments, but more and more applications now require mode-locked lasers to operate under less stable or even harsh conditions, such as in industrial manufacturing plants, vehicles, aircraft, rockets and even in the satellite. Polarization-maintaining fiber m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/067H01S3/11
CPCH01S3/1112H01S3/06712H01S3/06791
Inventor 邹宏新张祥
Owner NAT UNIV OF DEFENSE TECH