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Femtosecond laser

A femtosecond laser and femtosecond technology, applied in the field of femtosecond lasers, can solve the problems of low performance stability, high mode-locking threshold, low peak power, etc., and achieve the effect of large repetition frequency range and low noise

Pending Publication Date: 2020-04-07
JIHUA LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing lasers have shortcomings such as output average power, low peak power, high mode-locking threshold, pulse width, low performance stability, complex structure, and large volume that are not conducive to practical applications. These are important research contents that researchers are concerned about.

Method used

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  • Femtosecond laser
  • Femtosecond laser

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] see figure 1 , is a schematic structural diagram of a femtosecond laser provided by the present invention, including: a self-mode-locked fiber oscillator 1, an amplifier, a stretcher-compressor and a bandpass filter.

[0028] Its working principle of the femtosecond laser provided by the invention is as follows:

[0029] The self-mode-locked fiber oscillator 1 generates and outputs a femtosecond seed pulse laser beam, and the stretcher-compressor expands the duration of the femtosecond seed pulse laser beam to reduce peak power; the amplifier Receive the femtosecond seed pulse laser beam stretched from the stretcher-compressor and amplify the amplitude of the stretched femtosecond seed pulse laser beam, and the amplified stretched pulse laser beam returns to the stretcher- Compressor, the stretcher-compressor receives the amplified stretched pulse laser beam and compresses the duration of the amplified stretched pulse laser beam and outputs it; the compressed stretched...

Embodiment 2

[0045] see figure 2 , the laser beam generating method of the femtosecond laser provided by the above-mentioned embodiment of the present invention, comprises the following steps:

[0046] Step S110: the self-mode-locked fiber oscillator 1 generates and outputs a femtosecond seed pulsed laser beam;

[0047] Step S120: the chirped volume Bragg grating 4 widens the duration of the femtosecond seed pulse laser beam to reduce the peak power;

[0048] Step S130: the first polarization-maintaining optical fiber 3 receives the femtosecond seed pulse laser beam broadened from the chirped volume Bragg grating 4 and amplifies the amplitude of the broadened femtosecond seed pulse laser beam, and after the amplification The stretched pulsed laser beam returns to the chirped volume Bragg grating 4;

[0049] Step S140: the chirped volume Bragg grating 4 receives the amplified stretched pulse laser beam, compresses the duration of the amplified stretched pulse laser beam and outputs it; ...

Embodiment

[0055] In this embodiment, the self-mode-locked fiber oscillator 1 is pumped by the pump module 2 and the first polarization-maintaining fiber 3 to achieve self-mode-locking, and the typical wavelength of the output femtosecond laser beam is 1030nm, and the pulse width is 500fs

[0056] -600fs, pulse frequency 100kHz-200kHz, pulse energy 10μJ-30μJ, beam diameter 3±1μm, beam quality M2<1.2;

[0057] After the chirped volume Bragg grating 4 is compressed, the pulsed laser beam is shaped by the band-pass filter composed of the polarization isolator 5, the second polarization-maintaining fiber 6 and the nonlinear polarizer 7, and then returns to the pump module 2 and outputs the pulse frequency 200KHZ, 600fs pulse width laser output, single pulse energy 30uJ, beam diameter 3±1μm, beam quality M2<1.2, duration less than 1000 femtoseconds.

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Abstract

The invention provides a femtosecond laser. A self-mode-locking optical fiber oscillator generates and outputs a femtosecond seed pulse laser beam; a stretcher-compressor is used for stretching the duration time of the femtosecond seed pulse laser beam; an amplifier receives the femtosecond seed pulse laser beam broadened from the stretcher-compressor and amplifies the amplitude of the broadened femtosecond seed pulse laser beam; the amplified broadened pulse laser beam is returned to the stretcher-compressor; the stretcher-compressor receives the amplified broadened pulse laser beam, compresses the duration of the amplified broadened pulse laser beam and outputs the amplified broadened pulse laser beam; the compressed broadened pulse laser beam is shaped by a band-pass filter and then returns to the amplifier, and a pulse femtosecond pulse laser beam is output. According to the invention, the femtosecond laser provided by the invention has a special cavity structure and the self-mode-locking optical fiber oscillator as a femtosecond pulse seed source, and selects and shapes the femtosecond pulse laser beam to obtain to-be-amplified femtosecond pulses with large repetition frequency range, high stability, low noise and no jitter.

Description

technical field [0001] The invention relates to the technical field of laser optics, in particular to a femtosecond laser. Background technique [0002] The initial optical frequency comb is a system based on a Ti:Sapphire solid-state femtosecond laser. Ti:Sapphire femtosecond laser has the advantages of low noise and the ability to generate comb teeth with high repetition rate, but the system is huge, the maintenance cost is high, and the system environment adaptability is poor. , can not meet the needs of various application fields. In recent years, with the advancement of fiber laser technology, the optical frequency comb system based on ultrashort pulse fiber laser has been widely used in many application research fields due to its compact structure, high conversion efficiency and long-term stable operation. Among them, the application research of fiber femtosecond laser is the most typical. Mode-locking techniques commonly used in fiber femtosecond lasers include satu...

Claims

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Application Information

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IPC IPC(8): H01S3/067H01S3/10H01S3/11
CPCH01S3/06754H01S3/06791H01S3/10038H01S3/11H01S3/1106
Inventor 周辉
Owner JIHUA LAB