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We experimentally demonstrate group velocity control of 40-fs, 1400-nm pulses through chi(2)-cascaded interactions under large group velocity mismatch. Group delay shifts up to 50 fs are achieved by propagation in a 25-mm-long PPSLT crystal.
We observed phase-matched frequency mixing of a THz wave with a near-infrared laser beam in a ZnGeP2 crystal. Such a process can be used to detect a THz wave in the range of 91-139 mum.
We have demonstrated that two-photon absorption in a 2-cm-thick bulk GaP crystal can be the mechanism for limiting the efficient generation of the ultrafast broadband THz pulses using short infrared laser pulses.
We propose a quantum key distribution scheme using the spatial properties of the entangled photon pairs generated from parametric downconversion. The security of this scheme is guaranteed by the distributed entanglement.
We observed 7.2 dB squeezing of continuous-wave light at 860 nm with a periodically-poled KTiOPO4 crystal in an optical parametric oscillator. The squeezing level was obtained as the LO phase was locked.
We report on a singly resonant injection seeded optical parametric ring oscillator with signal pulse energy of up to 38 mJ, 50% pump depletion, spectral purity of 99.97%, and M2 of about 6.
This paper deals with the microstructure of the generated crystals in borate glass by femtosecond laser irradiation, Raman spectroscopy was used to study the distribution of the two phases of barium metaborate crystals produced.
Positive thermal lens in optical element (Faraday isolator in our case) produced by absorption of high power radiation was experimentally compensated with negative thermal lens in DKDP sample self-adaptive to different radiation powers.
We have measured thermal conductivity of Y3Al5O12, GdVO4, and YVO4. It was found that YVO4 has larger thermal conductivity than GdVO4. Nd3+-doping effect in thermal conductivity and thermal expansion ratio have been also discussed.
We report a compact, narrow-line intracavity OPO with a grazing-incidence grating. This kHz pulsed OPO fits into a 25 times 25 cm area, generating 30 muJ/pulse at 1560 nm with a linewidth of 0.8 cm-1.
The optical properties of rare earth doped silver halide crystals were studied in the middle infrared spectral range. The results indicate that these materials are promising candidates for development of mid-IR fiber lasers and amplifiers.
We present a contrast filter reaching 12 orders of magnitude from micro to milliJoule input pulse with 24% efficiency. It solves contrast issue for Petawatt class lasers in microjoule seeded CPA or double CPA scheme.
The OPO arrangement with intracavity OPA at the idler wavelength is experimentally and theoretically investigated in the context of pulsed devices emitting several mJ. Benefits and drawbacks are discussed versus the conventional singly resonant OPO.
Two-beam pumped noncollinear PPKTP OPO generating two signal waves with tunable spectral separation is demonstrated. The coherent pumping leads to a parametric gain grating which resonantly enhances cascaded sideband generation by the second-order nonlinear interaction.
We investigated third harmonic generation and triple photon generation properties of TiO2 rutile single crystal, including phase-matching and figure of merit. We demonstrated that TiO2 is more efficient than KTiOPO4.
Parametric amplification of a 4.3-4.7 mum microchip gain-switched Fe:ZnSe laser radiation is reported. As an amplifier medium, we have used a 2.92-mum-pumped OPA based on ZGP crystal. The single-pass amplification factor of 2 was achieved.
Lithium niobate crystals doped with hafnium exhibit a significant suppression of the photorefractive effect and represent a promising substrate for wavelength converter devices. In this work we present a systematic investigation of their physical properties.
Using top-electrodes, we demonstrate the soliton-based miniaturized integration of electro-optic devices in a photorefractive paraelectric bulk crystal. Self-trapping and beam manipulation though soliton electro-activation is achieved at quasi-digital voltages.
Optical waveguides in nonlinear crystals of Sn2P2S6 have been produced by He+ ion implantation. Best results are obtained with a fluence about Phi = 0.5 middot 1015 ions/cm2 and for hybrid n1-mode. The depth of the induced optical barrier is Deltan1 = -0.07 at lambda = 0.633mum.
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