Self-mode-locking laser

A laser, self-mode-locking technology, applied in lasers, laser parts, phonon exciters, etc., can solve problems such as poor reproducibility, achieve a lower mode-locking threshold, maintain stable output power and pulse width for a long time, and system simplistic effect

Inactive Publication Date: 2009-04-22
NANJING UNIV
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Problems solved by technology

However, it is difficult for this ideal flat-top Gaussian pump beam to form an effective self-starting mode-locking effect in laser crystals. Although there have been some theoretical proofs that a gain

Method used

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Embodiment Construction

[0020] (1) Use a coupling system to modulate the 527nm pump beam output by Nd:YLF frequency doubling, so that the beam incident on the laser crystal is a flat-top Gauss beam with a concave central light intensity, as shown in the attached figure 1 (a), using the attached figure 1 (b) The folded cavity shown in (b), the laser crystal is Ti: Sapphire, and the cavity mirror coating is M 1 ,M 3 ,M 4 : HR (high reflection)@750-850nm, M 2 : HR@750-850nm&HT (high transmission)@527nm, M 5 : T (transmittance) = 3.6%@750-850nm, can realize broadband continuous femtosecond pulse output.

[0021] (2) Use a lens group to realize the modulation of the flat-top Gaussian pump beam, so that the pump beam incident on the laser crystal is a beam with a concave central light intensity, as shown in the attached figure 2 (a), using the attached figure 2 (b) The end-pumped Z-fold cavity shown in (b), the laser crystal is Nd:YVO 4 , mirror coating M 1 : HR@1342&HT@808nm, M 2 ,M 3 : HR@134...

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Abstract

The invention relates to a setting method of a self-locking model laser. Pump light irradiates into a laser cavity resonator from an end surface of a laser crystal; a beam shaping system is adopted to enable the light intensity at the central part of a pump luminous spot to be less than the surrounding light intensity so as to cause a Gauss beam with a sunken part in the center; the laser crystalis used as a model locking part while used as a laser gain crystal; an area similar to a diaphragm is formed at the center of the laser crystal; the size of the diaphragm area can be controlled through adjusting a pump beam; the Kerr effect of the crystal and a soft diaphragm commonly act to complete the starting and maintenance for laser running of the locking model and realize the ultrashort pulse output of a continuous locking model or realize the locking model pulse output of Q regulation. The invention solves the problem existing in the existing ultrashort pulse laser that the system is huge, peripheral equipment is more, the precision required by the modulation is high, and self-starting can not be performed, improves the efficiency, reduces the cost and has very high application value.

Description

technical field [0001] The invention relates to a self-mode-locked laser, in particular to a self-starting self-mode-locked laser. Background technique [0002] Kerr lens mode locking is currently one of the most effective methods for obtaining ultrashort pulses from solid-state lasers. The simplest specific device is to use the nonlinear refractive index of the laser crystal as the soft aperture formed by the Kerr medium and the gain distribution inside the laser material (see Spence D.E.etc., Opt.Lett.16, p42), but because the laser crystal The nonlinear refractive index itself is generally relatively small, and is limited by the saturation light intensity of the laser crystal itself. Only when the peak power density of the oscillation pulse reaches a certain intensity can an effective gain stop be formed in the crystal, and then in the cavity A non-linear loss that decreases with increasing light intensity is formed to maintain continuous mode-locked operation. In pract...

Claims

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Application Information

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IPC IPC(8): H01S3/098H01S3/11
Inventor 潘淑娣祝世宁
Owner NANJING UNIV
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