Device for generating femtosecond pulses with high peak power and high average power

A femtosecond pulse and average power technology, which is applied to laser components, electrical components, phonon exciters, etc., can solve the problems of complex temporal and spatial distribution of pulse energy, small spectrum broadening, low light intensity gradient, etc., and achieve beam quality Improvement and optimization, high average power, and the effect of broadening the spectrum

CN107453190BActive Publication Date: 2019-09-20SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-09-20

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Abstract

A generation device of femtosecond pulses having the high peak power and the high average power comprises a first ytterbium doped picosecond laser and a second ytterbium doped picosecond laser, and a beam splitter, a convex mirror, a hollow optical fiber device filled with an inert gas, a concave mirror and a chirp mirror set are arranged in the laser output direction of the second ytterbium doped picosecond laser orderly. The laser outputted by the first ytterbium doped picosecond laser is in beam combination with the laser outputted by the second ytterbium doped picosecond laser at the beam splitter via a reflector, and the femtosecond pulses having the high peak power and the high average power are outputted by the convex mirror, the hollow optical fiber device filled with the inert gas, the concave mirror and the chirp mirror set. The device of the present invention has the anti-time jitter robustness, can generate the femtosecond pulses which have the high peak power, high average power and high repetition frequency and of which the light beam quality is improved and optimized, and facilitates the related research of the strong field physics.
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Description

technical field

[0001] The invention relates to ultra-intense and ultra-short laser pulses, in particular to a device for generating femtosecond pulses with high peak power and high average power, so as to facilitate the related research of strong field ultrafast physics. Background technique

[0002] Ultrashort and ultraintense laser pulses based on Ti:Sapphire lasers have undergone rapid technological progress and have become powerful tools for many ultrafast scientific researches, such as time-resolved measurements of atomic and molecular systems, high-order harmonic generation, and laser particle acceleration. The main advantage of Ti:Sapphire laser is its wide gain bandwidth, which can generate short pulses less than 30fs. Although the peak power of these optical pulses is sufficient for probing non-perturbative physical processes, the repetition frequency and average power of the generated optical pulses are low due to the high quantum defects of Ti:sapphire lasers. H...

Examples

specific Embodiment

[0033] The center wavelengths of the two laser pulses output by the first ytterbium-doped picosecond laser 1 and the second ytterbium-doped picosecond laser 2 are 1053nm and 1064nm respectively, the energy is 5mJ, and the pulse width is 1ps. The air-filled hollow fiber device 6 The parameters of the air-filled hollow fiber are: 250 μm inner diameter, 1 m length, filled with 5 bar neon gas, and the compensation amount of the chirped mirror group 8 is -560 fs 2 . Such as image 3 As shown, under the same conditions, the input pulse composed of two picosecond pulses, compared with a single 1053nm or 1064nm wavelength input pulse, after passing through the gas-filled hollow fiber, has a higher time-domain intensity gradient due to the intensity envelope modulation , the spectral broadening degree is enlarged by 10 times. For the convenience of comparison, the ordinate in the figure shows the normalized light intensity. After theoretical calculation, the time-domain Fourier tran...