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0.7 watts 355nm laser is achieved from 3rd-order-QPM PPMgSLT by sum-frequency generation of fundamental and second-harmonic of pulsed Nd: YVO4 laser. 2nd-order-QPM PPMgSLT is successfully fabricated, which promises 355 nm generation of sub-watts order.
We study nonlinear frequency generation in media with random ferroelectric domain structure. We show that randomness enables one to realize broadband third harmonic generation via cascading of two second order quasi-phase matched nonlinear processes. We investigate spatial and polarization properties of the emitted waves and find them to be in agreement with theoretical predictions.
Harmonics up to the 15th order are produced from solid targets using 3 mJ, 30 fs pulses focused to a spot size of 1.7 μm and 3 × 1018 W/cm2. Combined conversion efficiency to the highest harmonics is > 10-5.
We demonstrate a new concept of spectrally-resolved wavefront characterization, particular useful for high-harmonic and soft X-ray radiation. It is based on an analysis of radiation diffracted from a slit scanned in front of flat-field spectrometer.
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