Device and method for generating envelop-adjustable ultrashort pulse sequences

Abstract

The invention provides a device and a method for generating envelop-adjustable ultrashort pulse sequences. The device comprises a pulse laser source used for outputting ultrashort pulse lasers with preset frequency and pulse width, a modulating signal generator used for outputting modulating signals, and an optical modulator used for modulating the ultrashort pulse lasers into optical pulse sequences in certain envelop shapes under the control of the modulating signals, and each envelop comprises at least two sub-pulses. Synchronization of the ultrashort pulse lasers and the modulating signals is realized by an optical splitter, optical pulses are accurately chosen, the optical pulse sequences in certain envelop shapes are generated, envelop shapes and repetition frequency of the optical pulse sequence and width of the envelop pulses can be freely adjusted by controlling the modulating signal generator, single pulse energy and peak power of the pulse sequences after being amplified can be remarkably increased, and processing requirements of short pulse sequence lasers are met.

Description

technical field [0001] The invention belongs to the field of laser technology, and relates to a laser pulse generation device and method, in particular to a device and method for generating an ultrashort pulse sequence with an adjustable envelope. Background technique [0002] With the development of laser processing technology, it has become possible to process materials with ultra-short pulse, ultra-high intensity, and ultra-short wavelength lasers. The instantaneous power of the ultrashort pulse laser is extremely high, and it can interact with almost any material, so the materials that can be used for ultrashort pulse laser processing are almost unlimited. Ultrashort pulse laser precision machining can obtain higher precision than long pulse laser machining, can process the surface of materials, and can process and modify the interior of transparent materials; especially for ultra-hard, fragile, high melting point, explosive The processing of other materials has advanta...

AI Technical Summary

Problems solved by technology

[0006] 3. Ultrashort pulse laser processing has no choice or limitation on materials, and the pulse energy threshold required for processing is extremely low, generally only in the order of millijoules

However, after the photoelectric modulator is applied to a high-power, high-energy pulse laser, it is easy to be damaged, resulting in a lack of application stability

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