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Mode-locked laser based on doped fiber array

A mode-locked laser and doped fiber technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problems of not being able to be all-fiber, unable to weld, difficult to couple gain fiber and fiber array, etc. Work efficiency, the effect of reducing post-process and loss

Inactive Publication Date: 2013-04-24
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the design of this document, the coupling between the gain fiber and the fiber array is more difficult, because their cladding diameters are quite different, they cannot be fused together, and cannot be fully optical fiber, and can only be coupled by a lens system

Method used

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  • Mode-locked laser based on doped fiber array
  • Mode-locked laser based on doped fiber array
  • Mode-locked laser based on doped fiber array

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Such as Figure 5 , the gain medium is an erbium-doped fiber array, and fiber gratings are used at both ends of the resonator as a cavity mirror. The pump light near 800nm, 980nm or 1480nm is absorbed when the pump light enters the erbium-doped fiber core on the way of internal reflection in the cladding, excites the ground state erbium ions, realizes the inversion of the upper energy level particles, and generates laser light in the resonant cavity . In the case of laser intensity fluctuations caused by slight vibrations, the weak light part will propagate to other cores, and the strong light part will continue to propagate in the doped fiber core due to nonlinear effects, reaching the Kerr mode-locking condition and obtaining a wavelength of 1.5 μm nearby ultrashort pulses.

Embodiment 2

[0042] Such as Figure 6 , the two ends of the ytterbium-doped fiber array are fused together, a coupler is added to it, and two couplers are fused, one coupler injects pump light with a wavelength near 915nm or 976nm, and the pump light is reflected in the cladding on the way When it enters the ytterbium-doped fiber core, it is absorbed, excites ytterbium ions in the ground state, realizes the inversion of the upper energy level particles, and generates laser light in the ring cavity. At the same time, the isolator can effectively prevent the reverse laser in the ring cavity. In the case of laser intensity fluctuations caused by slight vibrations, the weak light part will propagate into other cores, and the strong light part will continue to propagate in the doped fiber core due to nonlinear effects, reaching the Kerr mode-locking condition, with a wavelength of 1000nm- Ultrashort pulses around 1100nm are output from another coupler.

Embodiment 3

[0044] By changing the wavelength of the pump light in Example 1 to around 980-1051nm, the dopant element to praseodymium, and the fiber grating reflection center wavelength to around 1290-1315nm, the mode-locked pulse light output within this range can be obtained.

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Abstract

The invention, which belongs to the ultrashort pulse laser field, relates to a mode-locked laser based on a doped fiber array. A doped fiber array which is arranged in a resonant cavity can be used to perform two processes of laser generation and Kerr mode locking. Mode-locked pulse can be directly output. The resonant cavity of a laser can be in linear and annular designs. The linear resonant cavity is formed by a doped fiber array (3) and a fiber grating (4). In the annular resonant cavity, the doped fiber array (3) is bended into an annular shape. Two couplers (5) are arranged on the dopedfiber array. An isolator (6) is arranged between the two couplers (5). After pump light (1) enters into the resonant cavity, the doped fiber part in the pumped fiber array generates laser. A peripheral fiber hole array possesses a nonlinear Kerr effect so that the generated light can be modulated so as to obtain mode-locked pulse output (2). A structure in the whole system is simple and compact. Stability is high, heat dissipation is good and a conversion efficiency is high.

Description

technical field [0001] The invention relates to a fiber laser for generating mode-locked laser pulses, belonging to the field of ultrashort pulse lasers. Background technique [0002] At present, passive mode-locking technology is widely used to generate ultrashort pulses, and ultrashort pulse lasers have important application value in the fields of biomedicine, optical communications, and optical clock signals. Ultrashort pulses can be obtained by Kerr mode-locking of nonlinear crystals, but this technology cannot be applied to all-fiber lasers, and lasers based on Kerr mode-locking inevitably have all the shortcomings of solid-state lasers, such as poor stability and heat dissipation Poor wait. In addition, passive mode-locked lasers based on saturable absorbers have been extensively studied in recent years. Saturable absorbers that are more commonly used include SESAM, carbon nanotubes, and graphene. Notoriously low damage thresholds and high power densities are require...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/07H01S3/098
Inventor 宋晏蓉张晓于振华田金荣张新平
Owner BEIJING UNIV OF TECH
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