Ultrashort laser pulse compression and purification device with tunable wavelength

Abstract

The invention provides an ultrashort laser pulse compression and purification device with tunable wavelength. Along with a light path forwarding direction, the device sequentially comprises a tunable optical parameter amplification system, a hollow optical fiber compression system, a secondary harmonic wave generation system and a pulse selection system, wherein the hollow optical fiber compression system comprises a reflector, a focusing lens, a vacuum pipe, a hollow optical fiber inside the vacuum pipe, a collimation lens and a dispersion compensator sequentially arranged along the light path; the hollow optical fiber is arranged in the vacuum pipe, inert gas is filled in the vacuum pipe, and gas pressure can be adjusted; the secondary harmonic wave generation system is formed by a broadband reflector and a frequency doubling crystal; the dispersion compensator is formed by a pair of quartz wedge plates; and the pulse selection system is formed by two dichroic mirrors which are arranged in parallel. By using the device, ultrashort laser pulse with tunable wavelength, high contrast, high light beam quality and period order can be acquired.

Description

technical field [0001] The invention relates to an ultrashort pulse laser, in particular to an ultrashort laser pulse compression and purification device with tunable wavelength. Background technique [0002] In recent years, with the development of femtosecond laser technology, the energy of pulsed laser is getting higher and higher, and the pulse width is getting shorter and shorter. Ultra-intense and ultra-short laser pulses have become an important tool in many basic researches and play an irreplaceable role in the field of laser physics research. In particular, period-level ultrashort laser pulses have very important applications in the fields of high-order harmonics and attosecond pulse generation. However, during the interaction of ultrashort laser pulses with matter, if the contrast of the laser pulse is too low, the pre-pulse can destroy the target before the main pulse arrives, thus destroying the whole experiment. at 10 21-23 W / cm 2 In the study of the interac...

AI Technical Summary

Problems solved by technology

The pulse purification ability of the device is limited by the extinction ratio of the polarizer and the analyzer, and half the contrast ratio can only be increased by 2-4 orders of magnitude on the original basis.

In addition, since the previous devices used third-order nonlinear effects, they are very sensitive to external influences

The instability of the input energy and the change of the air flow in the device will cause the output beam to shake and the energy to change drastically

Images