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High-repetition-frequency high-energy nanosecond pulse laser and using method thereof

A pulsed laser and high-energy technology, which is applied to lasers, laser components, phonon exciters, etc., can solve problems such as low repetition frequency, harsh operating environment requirements, and difficult amplification, and achieve good calibration and amplification effects

Active Publication Date: 2020-03-13
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there have been reports of laser systems with a single pulse energy greater than 100J, but their repetition rate is very low, generally lower than 10Hz, which limits some of its applications; and for pulse lasers on the order of hundreds of Hz, the highest single pulse energy is 5J, The repetition frequency is 200Hz; both lasers adopt the MOPA structure, which makes the system structure very complex, the cost is high, the efficiency is relatively low, the requirements for the operating environment are harsh (cannot meet the needs of field operations), and further amplification is difficult; and the use of structure A simple single resonator oscillation method can also obtain a pulsed laser, but it is limited by the solid-state laser spot aperture and the size of the active modulation element. The maximum single pulse energy obtained is only on the order of hundreds of mJ, which is not enough to cause damage to the optical system. It is also difficult to meet the needs of special industrial processing

Method used

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  • High-repetition-frequency high-energy nanosecond pulse laser and using method thereof

Examples

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Embodiment 1

[0022] The first embodiment of the present invention is as figure 1 As shown, the present invention provides a high-repetition-frequency high-energy nanosecond-level pulsed laser (polarizer transmissive electro-optic Q-switching), including:

[0023] Pump laser 1; laser gain cell 2, concave mirror 3, convex mirror 8, scraper mirror 4, thin film polarizer 5, Pockels cell 6, and λ / 4 wave plate 7, concave mirror 3 and convex reflector The magnification M=2 of mirror 8, the cavity length (the cavity length is the optical distance between the concave reflector and the convex reflector) 1500mm, the radius of curvature of the concave reflector and the convex reflector are respectively 6000mm and 3000mm; The light transmission direction of the oscillating laser in cell 2 is defined as the x-axis direction, the light transmission direction of the pump light is defined as the y-axis direction, and the direction of the z-axis is determined according to the right-hand rule; the gain medium ...

Embodiment 2

[0025] The second embodiment of the present invention is as figure 2 As shown, the present invention provides a high-repetition-frequency high-energy nanosecond pulse laser (polarizer reflective electro-optic Q-switching), only the electro-optic Q-switching part is different, and the others are the same as in Embodiment 1. The electro-optic Q-switching device adopts polarizer reflective electro-optic Q-switching; along the x-axis direction, a concave reflector 3, a laser gain pool 2, a scraper mirror 4, and a film polarizer 5 are arranged in sequence. After the film polarizer 5, along the In the y-axis direction, a Pockels cell 6, a λ / 4 wave plate 7 and a convex reflector 8 are arranged in sequence, the concave surface of the concave reflector 3 faces the laser gain pool, and the convex surface of the convex reflector 8 faces the λ / 4 wave plate; The electro-optic Q-switching process is: the gain medium Nd:YAG crystal is pumped by the pump laser 1, emits natural light, and aft...

Embodiment 3

[0027] The third embodiment of the present invention is as figure 1 As shown, the present invention provides a high-repetition-frequency high-energy nanosecond-level pulsed laser (polarizer transmissive electro-optic Q-switching), and only the gain medium part in the pump laser 1 and the laser gain cell 2 is different from that of Embodiment 1. different, everything else is the same.

[0028] The pumping laser beam output by the pumping laser 1 has a wavelength of 940nm, a repetition rate ≥ 200Hz, and a single-array pumping average power of 10kW. Medium Yb: inside YAG ceramics, which provides gain for the formation of laser, the output laser wavelength is 1030nm, the output spot is an annular hollow spot on the outside (60mm×60mm) and inside (30mm×30mm), single pulse energy ≥ 20J, repetition frequency ≥200Hz.

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Abstract

The invention discloses a high-repetition-frequency high-energy nanosecond pulse laser and a using method thereof. The high-repetition-frequency high-energy nanosecond pulse laser comprises a pump laser, a laser gain pool, an unstable resonant cavity and an electro-optical Q-switching device. A pump laser beam outputted by the pump laser is pumped from the end face of a gain medium of the laser gain pool, is transmitted into the laser gain medium and provides energy for the resonant cavity; laser oscillates in an unstable resonant cavity composed of a concave reflector, a convex reflector anda scraper mirror, pulse modulation is conducted through the electro-optic Q-switching device, and finally pulse laser is outputted from the scraper mirror. The invention provides the laser for realizing high repetition frequency (greater than or equal to 200Hz), large energy (greater than or equal to 20J) and narrow pulse width by single-cavity oscillation. The laser has the advantages of being high in efficiency, simple in structure, good in magnification, reliable in use, high in environment adaptability and the like, and can be widely applied to industrial processing, especially to the field of cladding impact strengthening.

Description

technical field [0001] The invention belongs to the technical field of high-energy pulse lasers, and in particular relates to a high-repetition-frequency high-energy nanosecond-level pulse laser and a method for realizing high-repetition-frequency high-energy nanosecond-level pulses with a single resonant cavity. Background technique [0002] Nanosecond pulse lasers with large pulse energy have very important application needs in industry, scientific research and national defense. In terms of industrial applications, various lasers, especially high-energy lasers, have also been widely used, including in laser processing, laser quenching, laser cladding, laser shock strengthening, and laser cleaning. Due to the high output power of high-energy lasers, it can also be used for direct laser rapid prototyping of components and metal surface modification applications. The most typical industrial application is that the service life of metal materials that have been strengthened by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/11H01S3/115H01S3/08
CPCH01S3/08059H01S3/1127H01S3/115
Inventor 陈莹郭敬为王鹏远刘金波张百超王颜超
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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