Ytterbium-doped multicore photonic crystal optical fiber mode-locked laser

A photonic crystal fiber, mode-locked laser technology, applied in the field of lasers, can solve the problems of inability to establish phase-locked operation, affecting the efficiency of the laser cavity, and disadvantages.

Inactive Publication Date: 2011-02-09
TIANJIN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

If the small hole is too large, it is not conducive to the full loss of other supermodes, and phase-locked operation cannot be established; if the small hole is too small, the loss of the same-phase supermode is too large, which affects the efficiency of the laser cavity

Method used

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  • Ytterbium-doped multicore photonic crystal optical fiber mode-locked laser
  • Ytterbium-doped multicore photonic crystal optical fiber mode-locked laser
  • Ytterbium-doped multicore photonic crystal optical fiber mode-locked laser

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Embodiment Construction

[0021] Ytterbium doped (Yb 3+ ) The specific implementation scheme of the multi-core photonic crystal fiber mode-locked laser is as follows:

[0022]First, the pigtail of the diode pumping source 1 is fixed on the five-dimensional precision optical 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 focus of the collimating aspheric lens 2 to fully collimate the pump light. The fiber pigtail of the diode pumping source 1 has a core diameter of 200 μm, a numerical aperture of 0.2, an output wavelength of 976-980 nm, and a maximum output power of 50 W. Aspherical lenses 2, 4, 8, 10, 15, and 19 are all coated with a broadband dielectric film with high transmittance in the 976-1100nm band, with a transmittance greater than 99.5%, and are fixed on a precise one-dimensional micro-displacement platform for precise adjustment Collimation...

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Abstract

The invention discloses an ytterbium-doped multicore photonic crystal optical fiber mode-locked laser, which belongs to the technical field of laser. The laser has a sigma cavity structure, a main body of the laser is based on a ytterbium-doped multicore photonic crystal optical fiber, and a single-mode optical fiber is used as a mode selector for selecting modes; the laser works in a totally positive dispersion area, no chromatic dispersion compensating element is in a cavity, and a semiconductor saturable absorption mirror is used for starting mode locking. The invention has the advantages of stability and easy operation of mode selection and wide spectrum, narrow pulse width and high energy of output pulse; the mode field area of the used multicore photonic crystal optical fiber is two orders of magnitude larger than that of an ordinary optical fiber, the single pulse energy which can be supported by the multicore photonic crystal optical fiber is also more than 100 times than that of a traditional optical fiber laser, a used mode-selecting element is a single mode optical fiber, and the far-field distribution of an output mode field is gauss distribution.

Description

technical field [0001] The invention relates to an ytterbium-doped multi-core photonic crystal fiber mode-locked laser, which belongs to the technical field of lasers. Background technique [0002] The prior art [1] is a photonic crystal fiber oscillation system that can output 18nJ single pulse energy. It contains a photonic crystal fiber with a mode field diameter of 29 μm. This kind of optical fiber introduces a periodically arranged air hole structure in the cladding, which can provide a mode field area an order of magnitude larger than that of traditional optical fibers and maintain single-mode operation. The single pulse energy is increased from the picojoule (pJ) level of traditional lasers to tens of nanojoules (nJ). However, due to the influence of bending loss and thermal lens effect, the mode field area of ​​photonic crystal fiber cannot be increased infinitely. In order to obtain higher pulse energy, it is often necessary to amplify the ultrashort pulse output ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/098
Inventor 胡明列方晓惠王清月
Owner TIANJIN UNIV
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