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Low-threshold-value femtosecond pulse fiber laser

A fiber laser, femtosecond laser technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problem of unimproved polarization state, reduce diffraction loss, avoid the reduction of optical path height, and improve stability. Effect

Inactive Publication Date: 2013-11-20
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

Since the patent does not improve the polarization state of the laser entering the grating, the structure requires the assistance of an energy pre-amplifier to ensure a certain output energy

Method used

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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, so as to facilitate the understanding of those skilled in the art.

[0033] A low-threshold femtosecond pulsed fiber laser such as figure 1 As shown, the femtosecond laser (100) adopts a half-space half-fiber ring cavity structure.

[0034] The femtosecond laser 100 is composed of a fiber-coupled semiconductor laser 101, a wavelength division multiplexer 102, an ytterbium-doped single-mode gain fiber 103, an output fiber collimator 104, an incident fiber collimator 105, a first quarter A glass slide 106, a first half-wave plate 107, a polarizing beam splitter 108, a Faraday rotator 109, a second half-wave plate 110, a first reflective grating 111, a second reflective grating 112, and mirrors 113 , an optical isolator 114 , and a second quarter slide 115 .

[0035] The Faraday rotator 109 and the second half-wave plate 110 are the most critical...

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Abstract

The invention relates to a low-threshold-value femtosecond pulse fiber laser. The low-threshold-value femtosecond pulse fiber laser consists of an optical-fiber coupling semiconductor laser, a wavelength division multiplexer, a ytterbium-doped single-mode gain fiber, two optical-fiber collimators, two quarter slides, two half slides, a polarization beam splitter, a faraday rotator, two reflection gratings, a reflection mirror and an optical isolator. The femtosecond laser adopts a semi-space semi-fiber annular cavity structure, the combined action of the faraday rotator and the half slides is adopted, and a group of grating pairs is adopted to carry out intra-cavity chromatic dispersion management on the laser, so that the polarization direction of the laser which passes through the faraday rotator twice is enabled to rotate for 90DEG and to be reflected from a vertical reflection port of the polarization beam splitter, a light path can be prevented from being lowered, and the introduction of an additional reflection mirror can be avoided; The polarization direction of the incident light which radiates on the first reflection grating is adjusted through the half slides, so that the highest diffraction efficiency can be achieved, the intra-cavity loss of the laser can be reduced, and an effect for reducing a mode locking threshold value can be realized.

Description

technical field [0001] The invention relates to an ultrashort pulse laser light source device, in particular to a low-threshold femtosecond pulse fiber laser. Background technique [0002] Due to its many characteristics, such as compact structure, high electro-optical efficiency, and excellent beam quality, femtosecond pulsed fiber lasers are increasingly widely used in research and application in various fields and disciplines. In particular, near-infrared lasers with pulse widths on the order of femtoseconds and picoseconds and center wavelengths around 1.0 microns are increasingly favored by the needs of biology, medicine, and fine processing. The active optical fiber doped with ytterbium ions is particularly suitable as a medium for generating and amplifying laser light near the 1.0 micron wavelength band. At present, in the laboratory, using this technology has obtained ultrashort pulse laser output with an average power of up to 100 watts and a peak power of more tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/106
Inventor 郝强曾和平
Owner UNIV OF SHANGHAI FOR SCI & TECH
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