deep-UV Pulses Research Articles

Spectral phase transfer for indirect phase control of sub-20-fs deep UV pulses

We demonstrate the transfer of a shaped spectral phase in a pulse with a sub-20-fs pulse Fourier limit of a Ti:sapphire laser to that in a deep UV pulse at 256 nm in a sum- frequency-mixing process. The generated UV pulse maintains a sufficiently broad spectrum to form a sub-20-fs pulse due to broadband sum-frequency mixing with the group-delay-dispersion-matched scheme. The spectral phases of the deep UV pulse are measured with spectral phase interferometry for direct electric field reconstruction and compared with the phase applied to the Ti:sapphire laser pulse.

Cw mode-locked deep UV pulses at an average power of 1.8 W

We report a cw mode-locked train of ~3.6 ps deep UV pulses with an average power of up to 1.8 W at 263 nm. This UV source is the result of two-stage, single-pass fourth-harmonic generation of an additive-pulse mode-locked Nd:YLF laser using KTP and BBO crystals. Conversion efficiencies of up to 47% from 1.053 µm to 527 nm and up to 39% from 527 to 263 nm have been observed.

Femtosecond deep UV pulse by high gain harmonic generation from a chirped seed

In this work we show that the techniques of high gain harmonic generation and chirped pulse amplification (CPA) can be combined to generate deep-uv radiation with peak power of order of 100 GW and pulse width of 5 fs. The resulting pulse would have wide range of applications.

Generation of 1-10 Ps Hard X-Rav Pulses for Time Resolved X-Ray Diffraction

We present a further improvement of our experimental system for the generation of hard x-ray pulses in the range 1-10 ps, A laser system based on a cw mode locked Nd:YLF laser is utilized for the emission of deep UV pulses at 193 nm with duration 1.5 ps and repetition rate of 300 Hz, This UV radiation is used to pump an x-ray diode which produces CuKa x-ray pulses with a duration shorter than 10 ps at 300 Hz.