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We demonstrate a unique pump-probe scheme for high harmonic spectroscopy, which is sensitive to weak excitations and provides spectral information without the need for a VUV spectrometer.
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 generate fully spatially coherent soft x-ray beams in the water window region of the spectrum using phase matched high harmonic upconversion of a 2 µm driving laser.
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.
We report on high-order harmonic generation from bulk zinc-oxide driven by a strong mid-infrared laser pulse. The harmonic spectra extend well above the band-gap and scales non-perturbatively with the laser intensity.
We report efficient second harmonic generation of 20.5 W continuous wave laser radiation at 1342 nm using MgO:PPLN. A second harmonic power of 9.5 W in a diffraction limited beam was reached, giving an efficiency of 46%.
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.
Extreme ultraviolet single-order harmonic pulses, separated by a pulse-front-tilt compensator, were spatially and temporally characterized to have a spot size of 58 µm at focus and a pulse duration of 47 fs.
We demonstrate second harmonic vortex generation in atmospheric pressure air using tightly focused femtosecond laser beam. The average second harmonic power is two orders of magnitude higher compared to previous reports.
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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