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Method for constructing cascade superlattice mode-locked laser

A technology of a mode-locked laser and a construction method, applied in the field of lasers, can solve the problems of low optical-to-optical conversion efficiency, small mode-locked stable area, poor output spot quality, etc., and achieves improved stability and optical-to-optical conversion efficiency, large nonlinearity The effect of loss factor

Inactive Publication Date: 2011-01-05
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] The problem to be solved by the present invention is: the cascaded second-order nonlinear mode-locked laser working in the phase mismatch state has high requirements on the cavity, the output spot quality is poor, the light-to-light conversion efficiency is low, and the stable region of the mode-locking is relatively large. Small

Method used

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  • Method for constructing cascade superlattice mode-locked laser
  • Method for constructing cascade superlattice mode-locked laser
  • Method for constructing cascade superlattice mode-locked laser

Examples

Experimental program
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Effect test

Embodiment 1

[0039] according to figure 1 A cascaded second-order nonlinear mode-locked laser realized by a 1064nm cascaded superlattice was fabricated. Diode laser for end-pumping, with an output wavelength of 808nm, a resonator front cavity mirror 1 with total reflection of 1064nm and high transparency of 808nm, laser gain crystal 2 is Nd:YVO 4 For the first cavity mirror 3 and the second cavity mirror 4 with a resonant wavelength of 1064nm and high reflection, select a suitable cavity type so that the laser spot size at the laser crystal 2 matches the cavity film and the cascaded optical superlattice 5 The size of the light spot meets the requirements of nonlinear conversion. The temperature-controlled furnace 6 is used to control the temperature of the nonlinear crystal, and the rear cavity mirror 7 of the resonator is used as the output mirror, which has a certain transmittance to 1064nm. The 1064nm laser emitted by the laser crystal resonates between 1 and 7. Through the action of ...

Embodiment 2

[0041] according to figure 1A cascaded second-order nonlinear mode-locked laser realized by a 1064nm cascaded superlattice was fabricated. The diode laser used for side pumping, the output wavelength is 808nm, the front cavity mirror 1 of the resonant cavity with full reflection to 1064nm, the laser benefit crystal position 2 is Nd:YAG, and the cavity mirrors 3 and 4 with high reflection to the resonance wavelength of 1064nm are selected Different parameters make the spot size of the laser at the laser crystal 2 match the cavity film, and the spot size at the cascaded nonlinear crystal 5 meets the requirements of nonlinear conversion. The temperature-controlled furnace 6 used to control the temperature of the nonlinear crystal and the resonant cavity The rear cavity mirror 7 is used as an output mirror and has a certain transmittance to 1064nm. The 1064nm laser emitted by the laser crystal resonates between 1 and 7. Through the action of the nonlinear crystal, the mode-locke...

Embodiment 3

[0043] according to figure 1 A cascaded second-order nonlinear mode-locked laser realized by a 1064nm cascaded superlattice was fabricated. The difference from Example 1 is that one end face of the laser crystal 2 is used as an input mirror, and this end face is highly transparent at 808nm and highly reflective at 1064nm. A mode-locked output of 1064nm is obtained.

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Abstract

The invention discloses a method for constructing a cascade superlattice mode-locked laser. In the method, cascade optical superlattices are used as nonlinear crystals, the cascade second-order nonlinear effect of two or more sections of domain-structure cascade optical superlattices is utilized to generate equivalent third-order nonlinear effect, and the nonlinear crystals are enabled to work atphase matching points by controlling the temperature of the optical superlattices through controlling the temperature of a furnace; a resonant cavity is adjusted to reach the requirement of nonlinearfrequency conversion; and the position of a diaphragm in the resonant cavity of a laser is set to ensure that the radius of facula at the position of the diaphragm is reduced along with the incrementof pumping power, the diaphragm realizes nonlinear loss modulation and spatial phase modulation is converted into intensity modulation, thus realizing mode locking laser output. The method can obtaina bigger non-linear loss coefficient, thereby being capable of supporting mode locking operation with larger stable area range, realizing self-starting of the mode-locked laser and improving the facula quality, stability and the optical to optical conversion efficiency.

Description

technical field [0001] The invention belongs to the technical field of lasers, relates to a mode-locked laser, in particular to a construction method of a cascaded superlattice mode-locked laser. Background technique [0002] All-solid-state picosecond lasers are widely used in nonlinear frequency conversion, industrial processing, spectroscopy, medical diagnosis and other fields, and can provide excellent picosecond seed sources for regenerative amplifiers [1]. For example, in the field of micromachining, compared with nanosecond lasers, it has smaller thermal ablation and can be used for fine processing; in the field of nonlinear frequency conversion, compared with semiconductor-pumped all-solid-state Q-switched nanosecond lasers, in the same Under the average power, it can provide greater peak power and obtain high nonlinear conversion efficiency. For example, using nonlinear crystal mode-locked solid-state lasers, through intracavity or extracavity frequency doubling an...

Claims

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Application Information

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IPC IPC(8): H01S5/34H01S5/065H01S5/0687H01S5/10
Inventor 刘艳花谢臻达吕新杰胡小鹏祝世宁潘淑娣赵刚
Owner NANJING UNIV
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