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High-order harmonic generation (HHG) in clusters (instead of separate gas atoms) is of high promise due to expanded options for quasi-phase matching and because clusters appeared to offer an increased optical nonlinearity [1]. To verify the latter, we investigate HHG from noble gas clusters in a supersonic gas jet. To identify a possible dependence of HHG on the average cluster size, we change the...
A universal phase mismatch compensation method, which can be applied to temperature-insensitive frequency conversion, is experimentally demonstrated. In this method, two nonlinear crystals and an electro-optic crystal are cascaded. The generated phase mismatch in the nonlinear crystal can be well compensated for in the electro-optic crystal, thereby improving the stability of frequency conversion...
The paper presents the peculiarities of the temperature dependence for the second harmonic generation efficiency of focusing laser radiation. It is shown that an asymmetry of the dependence is the result of the vector phase-matching process near the crystal axis.
We report on all periodically-poled crystals based singly-resonant optical parametric oscillator (SRO) generating continuous-wave, single-frequency, tunable UV radiation with maximum output power of 336mW in 18.5 MHz line-width at 399.2nm. It has tunability of 18nm.
Second harmonic 266nm generation was demonstrated by periodically-poled LaBGeO5 (PP-LBGO) with 2nd-order QPM structure. More than 15mW of 266nm was obtained from nanosecond-pulsed 532nm laser. Circular beam at 266nm without walk-off was obtained.
Dependence of the nonlinear-optical periodically poled lithium niobate (PPLN) crystal temperature on laser power in the course of laser frequency conversion was measured using its piezoelectric resonances. Concept of the equivalent temperature of the crystal heated by laser radiation was used for precise measurement of PPLN temperature tuning curves.
We report on a coherent detection of monochromatic terahertz-wave pulses by using a frequency up-conversion in a nonlinear MgO:LiNbO3 crystal at room temperature. The generation of the detection signal is based on optical parametric mixing between a generated terahertz-wave radiation and a seeded idler beam, and an intense near-IR pumping beam. We measured the intensity and the phase of the input...
Dependence of the nonlinear-optical crystal piezoelectric resonance frequencies on temperature was exploited for detailed investigation of crystal interaction with laser radiation. Nonlinear temperature change of periodically poled lithium niobate (PPLN) crystal was observed in laser frequency doubling experiment. Optical absorption and heat transfer coefficients were measured for PPLN and lithium...
HgGa2S4 is employed in a 1064-nm pumped optical parametric oscillator, to generate ∼5-ns long idler pulses near 4 μm with energies as high as 6.1 mJ and average power of 610 mW at 100 Hz.
Dependence of the poled nonlinear-optical lithium niobate (PPLN) crystal temperature on laser power in the course of laser frequency conversion was measured using crystal piezoelectric resonance. Dramatic temperature change of PPLN was observed near the temperature of the phase matching condition when second harmonic is efficiently generated.
By mixing three optical frequencies generated by an optical parametric oscillator under a novel configuration based in nonlinear crystals, multiple THz frequencies are efficiently generated. They can be used to pursue variety of novel applications.
We have measured the temperature variance of the second order susceptibilities for the LiCsB4O7 borate. Our measurement show that at the temperature of about 225 K, the second order susceptibilities show its maximal signal of about 1.15 pm/V with accuracy up to 0.08 pm/V. This measurement was done using Nd-YAG laser of 7 ns pulse-width at 1064 nm with frequency repetition 1 Hz as fundamental ones.
We present a new wavelength and temperature dependent refractive index equations for 0.5% MgO doped periodically poled stoichiometric LiTaO3 crystal for both extra-ordinary and ordinary polarizations. Our equations fit experimental data over a wide temperature (25-250??C) and spectral ranges: 0.35-6 ??m for the extra-ordinary wave and 0.375-3.75 ??m for the ordinary wave. The equations were cross...
Near-stoichiometric lithium tantalate crystals were produced by vapor-transport equilibration. Control of processing conditions has enabled generation of 10.5 W of CW 532-nm radiation by SHG from 29 W of 1064-nm radiation.
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