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Sigma cavity ultrashort pulse fiber laser with variable output rate

A fiber laser, ultra-short pulse technology, used in lasers, laser parts, phonon exciters, etc., can solve problems such as nonlinear phase shift differences

Inactive Publication Date: 2012-07-11
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] δ nonlinear phase shift difference;

Method used

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  • Sigma cavity ultrashort pulse fiber laser with variable output rate
  • Sigma cavity ultrashort pulse fiber laser with variable output rate
  • Sigma cavity ultrashort pulse fiber laser with variable output rate

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Embodiment Construction

[0025] In the structure of the present invention, if the output ratio of the central coupler is k, and the transmittance of the variable optical attenuator is h, after calculation, the transmittance of the improved NOLM is determined by the following formula:

[0026] T NOLM =h[1-2k(1-k)·(1+δ)] (3)

[0027] δ=2π(1-k-hk)n 2 |A in | 2 L / λ (4)

[0028] Among them: T NOLM Transmittance

[0029] δ nonlinear phase shift difference

[0030] From the comparison of (1) and (3), it can be seen that under the same central coupling ratio, input power and oscillation wavelength, the transmittance of the traditional NOLM is constant, while for the improved NOLM, its transmittance is at the center When the coupling ratio is constant, different transmittances can be obtained by changing the transmittance of the variable attenuator.

[0031] This patent asymmetrically introduces a variable optical attenuator into the NOLM of this fiber laser, so that the output coupling ratio of th...

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Abstract

A sigma cavity ultrashort pulse fiber laser with variable output rate comprises a reflective semiconductor saturable absorption mirror, a non-linear optical loop mirror, a first polarization controller, WDM, and a second polarization controller; the incidence end of the WDM is connected with a pump source, the combining end of the WDM is connected with the transmission-type semiconductor saturable absorption mirror sequentially through a doped fiber and the second polarization controller; the non-linear optical loop mirror comprises a non-linear optical loop constructed by SMF, and a central coupler, one fiber of the central coupler is connected with the WDM, and the other fiber is used as the emitter end of the whole laser, the non-linear optical loop mirror also comprises a variable optical attenuator, and the variable optical attenuator is positioned at the asymmetric position of the non-linear optical fiber constructed by SMF. The invention has regulative transmission ratio, stillcan output laser with the central coupling ratio of 0.5, and has broad application prospect.

Description

technical field [0001] The invention relates to a fiber laser, in particular to a σ-cavity ultrashort pulse fiber laser with variable output rate. Background technique [0002] Compared with traditional solid-state lasers, fiber lasers have been extensively studied due to their small size, high light-to-light conversion efficiency, and high stability. Among them, especially the erbium-doped fiber lasers that can be used for communication and the ytterbium-doped fiber lasers used for laser processing have attracted people's attention. [0003] The form of the σ cavity in the erbium-doped fiber laser and the ytterbium-doped fiber laser is very common. In the σ-cavity fiber laser, the traditionally seen structure is a reflective semiconductor saturable absorber mirror (SESAM) on one side, and a nonlinear amplification on the other end. Loop Mirror (NALM) or Nonlinear Optical Loop Mirror (NOLM). [0004] In a σ-cavity fiber laser using a nonlinear optical loop mirror (NOLM), w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/067H01S3/10H01S3/08H01S3/11
Inventor 赵卫张伟王屹山杨直王虎山李成
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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