Full-positive-dispersion er-doped optical-fiber laser device based on optical-grating filtering and adjustment method thereof

An erbium-doped fiber, total positive dispersion technology, which is applied in the control field of a total positive dispersion erbium-doped fiber laser, and can solve problems such as difficult total positive dispersion fiber lasers

Active Publication Date: 2014-05-07
PEKING UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, single-mode fiber produces negative dispersion in the 1.5μm band, so it is difficult to realize a fully positive dispersion fiber laser

Method used

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  • Full-positive-dispersion er-doped optical-fiber laser device based on optical-grating filtering and adjustment method thereof
  • Full-positive-dispersion er-doped optical-fiber laser device based on optical-grating filtering and adjustment method thereof
  • Full-positive-dispersion er-doped optical-fiber laser device based on optical-grating filtering and adjustment method thereof

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Embodiment Construction

[0024] The present invention will be further described through the embodiments below in conjunction with the accompanying drawings.

[0025] Such as figure 1 As shown, the total positive dispersion erbium-doped fiber laser of the present embodiment includes: polarization beam splitter prism PBS, isolator ISO, first 1 / 4 slide QW1, grating G, first collimator CL1, gain fiber F, wavelength division The multiplexer WDM, the second collimator CL2, the second 1 / 4 slide QW2 and the 1 / 2 slide HW form a ring resonant cavity; the pump source P is coupled to the gain fiber through the wavelength division multiplexer WDM. The P polarization component of the pulse oscillates in the ring resonant cavity through the polarization beam splitter PBS, and the S polarization component of the pulse is reflected by the polarization beam splitter PBS, and then reflected by the plane mirror M, as a stable output.

[0026] The pumping source P is pumped reversely by a 974nm single-mode diode with an ...

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Abstract

The invention discloses a full-positive-dispersion er-doped optical-fiber laser device based on optical-grating filtering and an adjustment method thereof. The full-positive-dispersion er-doped optical-fiber laser device includes a polarization beam-splitting prism, an isolator, a first 1 / 4 wave plate, an optical grating, a first collimator, a gain fiber, a second collimator, a second 1 / 4 wave plate and a 1 / 2 wave plate so that an annular resonance cavity is formed. A pumping source is coupled to the gain optical fiber through a wavelength division multiplexer. A coupler is connected to the second collimator through the optical fiber. An optical grating is inserted into the annular resonance cavity and the optical grating is used as a filter in the resonance cavity. Through adjustment of the transverse position and the angle of the first collimator, the direction of the first collimator is adjusted so that diffraction light of a specific center wavelength enters the collimator and thus a self-locking mode of the laser device is realized through filtering; and the distances between the first collimator and diffraction points of the optical grating are adjusted so that adjustment of the spectral width of output pulses is realized.

Description

technical field [0001] The invention relates to a fiber laser, in particular to a control method for a total positive dispersion erbium-doped fiber laser for mode locking by using a grating as a laser cavity filter. Background technique [0002] Single-mode fiber lasers were born in the mid-1980s, and truly stable ultrashort-pulse fiber lasers (20ps) appeared in 1989. In recent years, with the development of solid-state femtosecond lasers, femtosecond-level fiber lasers have also appeared, and become a strong competitor of femtosecond solid-state lasers. Its biggest advantages are miniaturization, high efficiency, energy saving, and good stability. [0003] The pulse formation mechanism in fiber lasers has gone through several stages from soliton type, stretching-squeezing type, self-similar type to total positive dispersion or amplified self-similarity. People's understanding of the mode-locking and pulse formation mechanism of fiber lasers is also improving . Fiber lase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/098H01S3/106
Inventor 施可彬刘关玉杨宏龚旗煌
Owner PEKING UNIV
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