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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.
The Z-scan and Thermal Lens techniques have been used to obtain the Auger upconversion parameter in Nd3+-doped materials. A comparison between these methods is done, showing that they are independent and provide similar results.
Dramatic enhancement of second and third harmonic generation near the photonic band edge was observed simultaneously in a one-dimensional ZnS/YF3 photonic crystal structure. The theoretical simulations are in good agreement with the experimental results.
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.
We demonstrate a muW-level broadly tunable THz source based on parametric down-conversion in orientation-patterned GaAs pumped by femtosecond pulses from a Tm-doped fiber laser. Generated THz powers should be scalable to mW-levels with this approach.
A light source using sum-frequency generation is developed for the ytterbium clock transition at 578 nm. Doppler-free spectroscopy of iodine lines near the Yb clock transition and frequency stabilization are demonstrated with the light source.
The combined use of fiber-Bragg-gratings and H2-filled HCPCF-based gas cells is reported to enhance the Raman conversion into the first Stokes by 13 dB and reduce the threshold of other Raman lines, making all-fiber-CW-Raman gas-laser possible.
We demonstrate theoretically the migration of entanglement of photon pairs produced in spontaneous parametric down-conversion from intensity to phase, and propose two experiments to observe the migration and to detect the ldquomissingrdquo entanglement.
Sum frequency data are reported from the nonlinear interaction of two coherently excited resonant modes of a two-dimensional planar photonic crystal microcavity patterned in a free-standing InP slab.
We have developed a vectorial quantum model of spontaneous parametric down-conversion in one-dimensional nonlinear photonic-band-gap structures that shows that these structures represent a promising perspective source of entangled two-photon states.
We report optical parametric generation and amplification in BiB3O6. Using 420 muJ, 35-ps pump pulses at 532 nm, signal and idler output pulse energies of 120 muJ have been generated at 29% efficiency.
Experimental studies of the electron and hole concentration dynamics in the barrier of GaSb-based type-II quantum-well (QW) heterostructures was performed. Difference between electron and hole relaxation rates is explained by corresponding QW carrier confinement energies.
This talk will be a tutorial on the physics of high harmonic generation in strong laser fields. The focus will be on the application of harmonics in the generation of attosecond pulses.
We have developed a broadly tunable, long-wave infrared difference frequency source based on orientation-patterned GaAs. The system has been applied to both cavity ring-down spectroscopy and multi-pass absorption for high specificity, high sensitivity chemical detection.
Conversion of cw light at 1.56 mum to Stokes wave was achieved with an efficiency of 27% using a 5-m-long As2Se3 chalcogenide fiber. Stokes shift and gain coefficient were 7.95 GHz and 6.08 times 10-9 m/W, respectively.
We show that a guided-wave approach to Fresnel phase-matching is relevant even for thick semiconductor wafers. This approach is implemented to design a bulk GaAs optical parametric oscillator and a terahertz generator by difference-frequency generation.
We propose a laser-frequency-based scale free from dispersive effects using a widely tunable laser and an optical frequency comb generator. We achieved displacement ranges up to 10 um with 220 pm uncertainty for measurement periods of 600 s.
Recent work in frequency-conversion of pulsed fiber-amplifiers is reviewed. Design criteria of frequency converters for fiber sources in operating the wavelength range between 1 um and 2 um are discussed.
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