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Novel type mode-locked laser

A mode-locked laser, a new technology, applied in the direction of lasers, laser components, phonon exciters, etc., can solve the problems of demanding technical conditions, high maintenance costs, high costs, etc., to achieve low cost, low manufacturing cost, high performance Reliable and stable effect

Inactive Publication Date: 2013-04-10
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most ultrafast laser products on the market use feedback circuits to connect optical modulators or micro-motion devices with software for system fine-tuning. Although they have good results, they are expensive, and the entire laser costs hundreds of thousands or even millions. And follow-up maintenance costs are high
Ultrashort pulse mode-locked lasers currently on the market often use electronic feedback systems and micro-displacement devices with software for fine-tuning in order to improve system stability, which makes the cost of mode-locked laser equipment high and the technical requirements are very stringent

Method used

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Examples

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Effect test

Embodiment 1

[0024] A new type of mode-locked laser, such as figure 1 As shown, it includes diode pumping source 1, coupling system 2, laser gain medium 3 and laser resonator, diode pumping source 1, coupling system 2 and laser resonator are arranged in order to form an optical path, and laser gain medium 3 is located in the laser resonator , which is characterized in that the laser resonator includes an input cavity mirror 4, two reflectors A5, B6, two semiconductor saturable absorption mirrors (SESAM) A7, B8, and the back of the input cavity mirror 4 is divided into two optical paths, one of which is in the optical path The sequence is laser gain medium 3, mirror A5, and semiconductor saturable absorbing mirror (SESAM) A7, and the sequence in the other optical path is mirror B6, semiconductor saturable absorbing mirror (SESAM) B8, and semiconductor saturable absorbing mirror (SESAM) A7 It is coated with a reflective film that is highly reflective to the resonant light in the cavity, and...

Embodiment 2

[0032] A new mode-locked laser, including a diode pumping source 1, a coupling system 2, a laser gain medium 3 and a laser resonator. The diode pumping source 1, coupling system 2 and the laser resonator are sequentially arranged in an optical path, and the laser gain medium 3 is located in In the laser resonant cavity, it is characterized in that the laser resonant cavity includes an input cavity mirror 4, two mirrors A5, B6, two semiconductor saturable absorber mirrors (SESAM) A7, B8, and the rear of the input cavity mirror 4 is divided into two optical paths, The sequence in one optical path is laser gain medium 3, reflector A5 and semiconductor saturable absorber mirror (SESAM) A7, and the sequence in the other optical path is reflector B6 and semiconductor saturable absorber mirror (SESAM) B8, semiconductor saturable absorber mirror (SESAM) A7 is coated with a reflective film that is highly reflective to the resonant light in the cavity, and the semiconductor saturable abs...

Embodiment 3

[0040] Same as Example 1, except that the laser gain medium 3 is Yb:GAGG crystal doped at 10 at%.

[0041] The resonant light, that is, the wavelength of the laser is 1030 nanometers; the semiconductor saturable absorption mirror (SESAM) A is coated with a reflective film that is highly reflective to the resonant light in the cavity with a wavelength of 1030 nanometers, and its reflectivity is greater than 99%; the semiconductor saturable absorption mirror (SESAM) B is coated with a film that partially reflects and partially transmits the resonant light in the cavity with a wavelength of 1030 nm, and its transmittance is 3.6%.

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Abstract

A novel type mode-locked laser comprises a pumping source, a pumping coupled system, a laser gain medium and a laser resonant cavity. Two semiconductor saturable absorber mirrors (SESAM) adopted in the cavity is capable of achieving stable ultrashort pulse laser output. One SESAM is capable of highly reflecting oscillation light in the cavity. The other SESAM has certain transmittance of the oscillation light. Pumping light pumps the laser gain medium after passing by the pumping coupled system. The one SESAM is saturated by the oscillation light in the cavity, and then the other SESAM is started and saturated by the oscillation light in the cavity. The two SESAMs are finally output outside the cavity through coupling of the transmission-type SESAM. The two SESAMs simultaneously have the functions of starting and maintaining mode-locked pulse. The novel type mode-locked laser has the advantages of being capable of having no need of external circuit feedback or manual control, effectively improving stability and reliability of the continuous mode-locked laser and greatly reducing cost, overcoming the defects of the existing single SESAM mode-locked laser, and compact in structure, simple and practicable in system and easy to popularize through engineering approaches.

Description

technical field [0001] The invention relates to the technical field of all solid-state lasers, in particular to a highly stable ultrashort pulse mode-locked laser. Background technique [0002] Laser processing is the most important application of laser technology. However, picosecond, sub-picosecond and femtosecond ultrashort pulse laser pulses have short duration and high peak power, and their mechanism of action in the field of laser processing is different from traditional continuous and nanosecond pulse laser processing. The absorption process is dominated by the nonlinear action process, which has the following incomparable advantages: a wide range of machinable materials, non-selective to materials; greatly reduced ablation threshold of materials; real optical cold processing, no Heat-affected zone, high processing precision; no plasma shielding effect, improved energy utilization; no material damage, no spatter; fast processing speed, etc. Ultrashort pulse laser ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/098H01S3/11
Inventor 何京良徐金龙张百涛侯佳刘善德杨英
Owner SHANDONG UNIV
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