Ultrashort laser pulse compression and purification device with tunable wavelength

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.