Method and apparatus for generating complex-shaped incoherent laser pulses that drive fusion shock ignition
A technology of laser pulses and complex shapes, which is applied to lasers, laser components, phonon exciters, etc., can solve problems such as complex structures and high costs, and achieve avoidance of uncertainty, good universality, and improvement of overall utilization efficiency Effect
Active Publication Date: 2019-05-24
CHINA INSTITUTE OF ATOMIC ENERGY
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[0007] The purpose of the present invention is to provide a method and device for generating an incoherent laser pulse with a complex shape that is efficient and feasible to drive fusion shock ignition for the Naval Laboratory (NRI) shock ignition pulse generation scheme with complex structure and high cost
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[0033] The Tianguang-1 system consists of a front-end discharge-pumped excimer laser (LPX-150), a three-cavity parallel primary discharge-pumped excimer laser amplifier CHEL3300, a two-stage electron beam-pumped excimer laser amplifier with preamplifier and main amplifier, and various The optical element group between the stages is composed. The front end of the system LPX-150 is transformed into an EFISI light source with beam uniformity better than 2%. The beam section with high uniformity at the front end is imaged on the target surface through the image transfer optical path to obtain high uniformity of target surface irradiation.
[0034] In order to carry out related experimental research on shock ignition, related work on incoherent pulse shaping has been carried out on the Skylight Facility. Among them, the laser pulse output by the existing 100 femtosecond ultraviolet light source is amplified by the discharge pump laser and then broadened to the picosecond level, wh...
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The invention relates to a generation method and apparatus of an incoherent laser pulse in the complex shape for driving fusion shock ignition. The method includes: the output of a main pulse (compression pulse) with a complex shape is realized at a freely operating incoherent light source by employing a gain saturation characteristic of an excimer laser so that a picket and a spike both with the width of picosecond level and the compression pulse are stacked to construct the laser pulse required by nuclear fusion shock ignition. According to the method and apparatus, an arbitrary waveform generator and an electro-optic modulator with high price are avoided, pulse shaping is realized by directly employing the gain saturation characteristic of a krypton fluoride excimer laser, the uncertainty brought by the optical Kerr Gate is avoided, an amplified control pulse sequence can be completely used as a seed beam of the diagnosis laser pulse required by beam-target physical diagnosis, the overall utilization efficiency of the apparatus is improved, there is no special requirement for application of wavelength, coherence and polarization of laser, and the universality is better for high-power laser pulse shaping.
Description
technical field [0001] The invention belongs to the laser design technology of laser nuclear fusion, in particular to a method and device for generating incoherent laser pulses with complex shapes to drive fusion shock ignition. Background technique [0002] Generating specific shapes of high-energy laser pulses is a fundamental requirement for laser-driven shock-ignition fusion. Shock wave ignition requires that the high-energy laser pulse consists of three parts: an ultrashort sharp pre-pulse, a main pulse with a specific shape, and a shock ignition pulse with a pulse width of hundreds of picoseconds. The delay between the three parts of the pulse needs to be adjusted according to the design of the target capsule and the laser power. Limited by the performance of the Pokes cell, it is also difficult to use the traditional Pokes cell clipping method to achieve such a complex waveform of the shock ignition laser pulse. Therefore, high-energy solid-state laser devices repre...
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IPC IPC(8): H01S3/225H01S3/102H01S3/104
CPCH01S3/1024H01S3/104H01S3/2256
Inventor 高智星李静王雷剑陆泽路建新
Owner CHINA INSTITUTE OF ATOMIC ENERGY