High average power mode-locked laser generating system and method based on cascading frequency shift
A mode-locked laser and average power technology, which is applied to lasers, laser components, phonon exciters, etc., can solve the problems of high control precision, large number of synthesis channels, and great difficulty in implementation, and reduce the maximum frequency shift. Requirements, breaking through the limitation of the number of splitting channels, and making up for the effect of cascading power loss
Inactive Publication Date: 2019-02-22
NAT UNIV OF DEFENSE TECH
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Problems solved by technology
To obtain a mode-locked laser with high average power requires a large number of syntheses, the system is very large, and the coherent synthesis technology of the mode-locked laser is relatively complicated, and the control accuracy is high. If the number of channels is too large, it is very difficult to realize. At present, the experimental 1kW, 1mJ just reached 8 optical fiber synthesis
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[0024] The laser and laser mode-locking techniques described in the present invention are explained as follows.
[0025] 1. Continuous laser
[0026] The laser seed source used in the present invention is different from the laser with shorter pulse width in the prior art, but a continuous laser whose output laser spectrum has a single-frequency or narrow-linewidth characteristic.
[0027] The working principle of a continuous laser is that under the action of an external excitation source, the light wave generated by the gain medium will be reflected back and forth between the two cavity mirrors at the front and rear of the resonator. When the laser emits laser light, in the transverse direction (perpendicular to the direction of laser transmission), only the light waves whose propagation direction is parallel to the direction of the resonator can repeatedly pass through the gain medium and be continuously amplified. It gradually deviates from the cavity mirror, and is eventu...
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The invention provides a high average power mode-locked laser generating system and method based on cascading frequency shift. The system includes a continuous laser seed source, multiple cascaded carrier frequency shift and laser beam splitting units, multiple parallel high power continuous amplifying units, and a heterodyne beam combination unit; first carrier frequency shift units are disposedon an emergent optical path of the continuous laser seed source, the frequency shift amount of each of carrier frequency shift units is the same, a laser beam splitter is disposed between each two carrier frequency shift units, and a carrier frequency laser is split from the laser beam splitter; each of the high power continuous amplifying units is placed on an optical path of a corresponding carrier frequency laser, and high power amplification is performed on the laser of the path; and the heterodyne beam combination unit performs heterodyne beam combination on lasers after power amplification of each of paths.
Description
technical field [0001] The invention relates to a laser mode-locking technology, in particular to a high-average-power mode-locked laser generation system and method based on cascade frequency shifting. Background technique [0002] Laser mode-locking technology is currently the main technical means to generate ultra-short and ultra-intense lasers. The ultra-short pulse width created by it has ultra-high time resolution, so it is widely used in the detection of ultra-fast phenomena, such as the detection of electronic transitions And relaxation, nuclear motion, chemical bond formation and other ultrafast processes. The ultra-high peak power brought by the ultra-short pulse width makes the mode-locked laser not only used for damage and processing of materials, but also used to create extreme physical environments, such as laser particle accelerators, laser controlled nuclear fusion, excitation Electrons and positrons are equal. [0003] Since the ultra-high peak power of th...
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IPC IPC(8): H01S3/00H01S3/10H01S3/098
CPCH01S3/0078H01S3/10061H01S3/10084H01S3/1106
Inventor 豆贤安孙晓泉卞进田刘尊洋
Owner NAT UNIV OF DEFENSE TECH