High-energy few-cycle ultra-high-signal to noise ratio femtosecond seed pulse generation device

Abstract

The invention relates to a high-energy few-cycle ultra-high-signal to noise ratio femtosecond seed pulse generation device. Laser outputted by an 800nm-wave band 1kHz laser is split into two beams; one of the two laser beams passes through a beam contracting system and a frequency multiplication crystal, so that a 400nm frequency-multiplied light can be generated, and the frequency-multiplied light passes through a light delay system, and then, adopted as pumping light, is injected into a nonlinear crystal; the other laser beam passes through a beam contracting system, a focusing system, an all-solid-state spectral broadening system, a dispersion compensation system and a cross polarization wave generating system sequentially, and then, adopted as signal lights, are injected into the nonlinear crystal, and the signal lights and the pumping light are altogether subjected to optical parametric amplification. The all-solid-state spectral broadening system is adopted, so that the spectrum of incident light can be effectively broadened, and therefore, the system can operate compactly and stably assuredly, and at same time, the device is convenient to adjust, is simple and efficient, can achieve integration and miniaturization, and can provide a high-quality seed source for ultrashort laser system.

Description

technical field [0001] The invention relates to the field of ultra-short laser pulses, in particular to a period-level ultra-high signal-to-noise ratio seed source. By combining all-solid-state spectral broadening, cross-polarized wave generation, second harmonic generation, and type I near-degenerate optical parametric amplification process, a femtosecond seed pulse generation device with large energy period and ultra-high signal-to-noise ratio is proposed. Background technique [0002] for the structure of matter in attoseconds (10 -18 s) order of time resolution and nanometer (10 -9 m) The huge demand for observation and manipulation on the spatial scale makes people urgently need attosecond coherent light sources. The use of solid-state high-order harmonics driven by ultra-intense and ultra-short lasers is one of the most promising ways to realize low-cost, desktop, and continuously tunable attosecond coherent light sources. The laser pulse with high peak power, ultra...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the limitations of the above-mentioned existing method for realizing femtosecond seed pulse ultra-high signal-to-noise ratio and period level, and propose a femtosecond seed pulse generating device with large energy period level ultra-high signal-to-noise ratio femtosecond seed pulse to solve the problem of ultra-high signal-to-noise ratio High signal-to-noise ratio and period-level problems, while having large energy properties, can provide an excellent seed pulse for high-power systems

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