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Double cladding large mode field area Yb-doped photon crystal optical fiber femtosecond laser

A technology of photonic crystal fiber and large mode field, which is applied in the field of laser technology and nonlinear optics, can solve the problems of pulse splitting, strong nonlinear effect, and limited energy injection level, etc., so as to avoid pulse splitting, good polarization maintaining characteristics, good stability effect

Inactive Publication Date: 2008-11-26
TIANJIN UNIV
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  • Abstract
  • Description
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Problems solved by technology

First, such fiber lasers must be pumped using low-power single-mode diode lasers (LDs), limiting the level of energy injected
Second, the core of the traditional optical fiber is very small, which makes the high-energy ultrashort pulse have a strong nonlinear effect when it is transmitted in the fiber, which will lead to pulse splitting, thereby destroying the stability of the operation of the ultrashort pulse fiber laser
Traditional ultrashort-pulse fiber lasers operate in a soliton mode-locked mode, and the pulse shape is hyperbolic secant, and the nonlinear chirp introduced by it will cause pulse splitting

Method used

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  • Double cladding large mode field area Yb-doped photon crystal optical fiber femtosecond laser
  • Double cladding large mode field area Yb-doped photon crystal optical fiber femtosecond laser
  • Double cladding large mode field area Yb-doped photon crystal optical fiber femtosecond laser

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Embodiment Construction

[0020] Double-clad large mode area doped ytterbium (Yb) with high pulse energy 3+ ) The specific implementation scheme of the photonic crystal fiber femtosecond laser is as follows: firstly, the pigtail of the LD laser 1 is fixed by a five-dimensional precision fiber adjustment frame to realize the precise adjustment of the pigtail's up and down, left and right, front and rear and inclination angles. Adjust the pigtail so that its exit end is located at the focal point of the aspheric lens 2, and the pump light is fully collimated. The core diameter of the LD 1 output pigtail is 200-400 μm, the numerical aperture NA is 0.2-0.4, the output wavelength is 976-980nm, and the output power is 5-30W. Using aspherical mirrors for focusing and collimation can effectively avoid spherical aberration and obtain diffraction-limited spots. The aspheric lenses 2, 4, 10, and 14 are all coated with a broadband dielectric film with high transmittance in the 976-1100nm band, with a transmittanc...

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Abstract

The invention discloses a double-coating large-mode-area photon crystal flysecond laser directly obtaining micro joule-level single pulse energy, belonging to the field of laser technique and nonlinear optics, where the laser main body is based on double-coating large-mode-area photon crystal optical fiber of polarization-protection structure and adopts high-power LD laser to directly pump; the laser uses grating pair to compensate dispersion, starts mode locking with the help of semiconductor saturable absorber mirror (SESAM), and controls polarization by wave plate and polarization beam splitter and implements tunable output; laser resonant cavity keeps net positive dispersion inside and runs in self-similar mode locking mode and outside-cavity dispersion compensation is made on the output pulse and the pulse is 100-200fs wide. And the advantages: the laser has good stability, and the output pulse has high energy and high repeating frequency. And the invention can effectively avoid split of pulse running at high energy.

Description

technical field [0001] The invention relates to a double-clad large-mode-field-area ytterbium-doped photonic crystal fiber femtosecond laser, belonging to the fields of laser technology and nonlinear optics. Background technique [0002] Ultrashort pulse fiber laser has outstanding advantages such as stable operation, high integration, low price, and convenient maintenance. Ultrashort-pulse fiber lasers generally use passive mode-locking to obtain femtosecond-level laser pulses. The passive mode-locking methods of ultrashort-pulse fiber lasers include nonlinear polarization rotation mode-locking, nonlinear fiber loop mirror mode-locking, and semiconductor saturable absorbing mirror (SESAM) mode-locking. Nonlinear polarization rotation mode-locking needs to add many polarization control elements in the optical path, which is difficult to adjust, and this mode-locking method is easy to saturate at high pulse energy, so it is only suitable for low pulse energy ultrashort pulse...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/35G02B6/02
Inventor 王清月宋有建胡明列柴路
Owner TIANJIN UNIV
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