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Ytterbium doped photonic crystal fiber nonlinear polarization rotation mode-locked laser device

A photonic crystal fiber and mode-locked laser technology, which is applied in the laser field and can solve the problems of low pulse laser power and low pulse energy

Inactive Publication Date: 2012-10-24
BEIJING UNIV OF TECH
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Problems solved by technology

[0008] In order to solve the problems of existing fiber laser oscillators, low pulse laser output power and low pulse energy, the present invention proposes a simple and effective laser system

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  • Ytterbium doped photonic crystal fiber nonlinear polarization rotation mode-locked laser device
  • Ytterbium doped photonic crystal fiber nonlinear polarization rotation mode-locked laser device

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with accompanying drawing:

[0020] Such as figure 1 As shown, the laser oscillation stage is a photonic crystal fiber laser, and the gain fiber is a Yb-doped large-mode field double-clad photonic crystal fiber with a length of 1.8m. The single-mode field diameter of the core is 29 μm (the corresponding single-mode field area is 660 μm2), the numerical aperture is 0.03, the inner cladding diameter is 170 μm, the numerical aperture is 0.62, and there are hexagonal periodically arranged air holes. The optical fiber has a laser absorption coefficient of 13dB / m for 976nm, which provides sufficient gain. The two ends are collapsed and polished to an 8-degree inclination (to prevent the generation of self-excited oscillation laser) and directly pass through the pigtailed 976nm semiconductor laser 1 collimated and focused into the photonic crystal fiber cladding pump, and the circularly polarized light is am...

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Abstract

The invention relates to an ytterbium doped photonic crystal fiber nonlinear polarization rotation mode-locked laser device, which belongs to the technical field of laser devices, and can directly provide laser output with high average power and high pulse energy from a laser oscillator. The laser device is mold-locked on the basis of a nonlinear polarization rotation principle, and is structurally characterized in that 976nm semiconductor laser is transmitted into an aspheric surface collimating mirror from the laser device firstly, passes by a dichroic mirror, is transmitted into a photonic crystal fiber through an aspheric surface focusing mirror, then is transmitted onto a dichroic mirror by an aspheric surface mirror in a collimated mode and reflected onto a 1 / 4 wave plate, passes by a narrow-band filtering plate and an optical isolator, sequentially passes by a half-wave plate and a 1 / 4 wave plate, finally passes by the dichroic mirror and is infiltrated into the photonic crystal fiber by the aspheric surface focusing mirror, and a resonant cavity of the laser device is formed. The laser device with the cavity has a simple structure, is easy to debug, can be used for producing laser with high average power and high pulse energy directly, and can be used for laser processing, nonlinear transformation and the like.

Description

technical field [0001] The invention relates to an ytterbium-doped photonic crystal fiber nonlinear polarization rotation mode-locked laser, in particular to a high-average-power pulsed laser system, and belongs to the technical field of lasers. Background technique [0002] High-power, high-energy pulsed fiber lasers are considered to be the development trend of future pulsed lasers due to their many advantages, but the traditional fiber core mode field area is small, and the power increase of fiber lasers is severely limited by nonlinearities. Traditional passive mode-locking technology is widely used in the design of pulsed lasers, such as semiconductor saturable absorber mirror as a mode-locking device to achieve stable mode-locked laser. However, in mode-locked lasers, due to the factors of the semiconductor saturable absorber used by itself, there is an upper limit of damage threshold, which limits the further improvement of the power of mode-locked lasers, and is also...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/098H01S3/083
Inventor 李平雪刘志池俊杰杨春赵自强
Owner BEIJING UNIV OF TECH
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