High-repetition-frequency passive-mode-locking ultrashort-pulse all-fiber laser

A high repetition rate, passive mode-locking technology, applied in the field of laser technology and nonlinear optics, can solve the problems of poor environmental stability, high production cost, complex structure, etc., and achieve the effect of narrow pulse width and high repetition frequency

Inactive Publication Date: 2012-03-07
BEIJING UNIV OF TECH
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  • Application Information

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Problems solved by technology

However, the pulse gain switching semiconductor laser has the disadvantages of complex structure and high production cost; while the harmonic passive mode-locked fiber laser has large jitter and relatively poor environmental stability; the high repetition rate passive mode-locked fiber laser does not require any external active modulation device, so the laser system

Method used

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  • High-repetition-frequency passive-mode-locking ultrashort-pulse all-fiber laser
  • High-repetition-frequency passive-mode-locking ultrashort-pulse all-fiber laser
  • High-repetition-frequency passive-mode-locking ultrashort-pulse all-fiber laser

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Embodiment 1

[0023] A high repetition rate passively mode-locked ultrashort pulse all-fiber laser structure such as figure 1 shown. Laser pump source 1 with a center wavelength of 974nm is connected to the pump input end of 980 / 1060 wavelength division multiplexer 2 with a maximum power of 500mW. The maximum output power of laser pump source 1 is 600mW; 980 / 1060 wavelength division multiplexer 2 The common end of the device 2 is connected to the fiber grating 3 with a reflectivity of 80%. The center wavelength of the fiber grating 3 is 1064nm, and the 3dB spectral bandwidth is 0.5nm; The 974nm band core pumping absorption rate is 1200dB / m; the other end of the ytterbium-doped fiber 4 is directly coupled with the reflective saturable absorber 5; the signal end of the wavelength division multiplexer 2 is used as the output end of the mode-locked laser pulse; A linear laser resonator is formed between the fiber grating 3 with an efficiency of 80% and the reflective saturable absorber 5. The ...

Embodiment 2

[0027] A high repetition rate passively mode-locked ultrashort pulse all-fiber laser structure such as Figure 5 shown. A laser pump source 1 with a central wavelength of 1550nm is connected to the pump input end of a 1550 / 2000 wavelength division multiplexer 2; the common end of a 1550 / 2000 wavelength division multiplexer 2 is connected to a 3m-long doped fiber 4; The other end of the miscellaneous optical fiber 4 is connected to a fiber grating 3 with a reflectivity of 90%, its center wavelength is 2000nm, and the 3dB spectral bandwidth is 2.0nm; the other end of the fiber grating 3 is used as the output end of the passive mode-locked laser pulse; 1550 / 2000 The signal end of the wavelength division multiplexer 2 is directly coupled to the reflective saturable absorber 5; a linear laser resonator is formed between the reflective saturable absorber 5 and the fiber grating 3 with a reflectivity of 90%; the high repetition rate Passively mode-locked ultrashort laser pulses will...

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Abstract

A high-repetition-frequency passive-mode-locking ultrashort-pulse all-fiber laser belongs to a laser technology and the nonlinear optics field. The laser mainly comprises: a laser pumping source, a wavelength division multiplexer, a fiber bragg grating, a doped fiber, a saturable absorber and the like. A short linear cavity is used to realize the high repetition frequency of the passive mode locking and ultrashort laser pulse output. The high-repetition-frequency ultrashort-pulse fiber laser uses a design of an all-fiber structure. Through multistage fiber power amplifiers, average output power can reach hundred watts. Therefore, by using the high-repetition-frequency ultrashort-pulse all-fiber laser, industrialization application is easy to be realized.

Description

technical field [0001] The invention relates to a high repetition frequency passive mode-locked ultrashort pulse all-fiber laser, which belongs to the field of laser technology and nonlinear optics. Background technique [0002] A high-power ultrashort pulse fiber laser usually consists of a low-power seed source and a multi-stage power amplifier. The low-power seed source determines key properties such as the output wavelength, pulse width, and repetition frequency of the laser, while the power amplifier determines the average power, pulse energy, and peak power of the laser output. Since the repetition frequency of the high-power ultrashort pulse fiber laser seed source is generally between 500kHz and 100MHz, the average output power of the seed source after passing through the fiber amplifier is less than a hundred watts. In the case of maintaining the same laser peak power, in order to obtain higher average output power, it can be achieved by increasing the repetition f...

Claims

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Application Information

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IPC IPC(8): H01S3/067H01S3/098H01S3/08H01S3/094
Inventor 王璞刘江
Owner BEIJING UNIV OF TECH
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