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Organic nonlinear crystals are most promising materials for efficient THz wave generation using DFG as well as TDS. Two kinds of organic crystals : 4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) and N-benzyl-2-methyl-4-nitroaniline (BNA) are investigated for ultrawide THz-wave generation. New THz applications will be presented using frequency-agile THz sources.
Terahertz is nonlinearly upconverted to telecommunication wavelengths, resulting in detection with 4.5 pW/Hz1/2 noise equivalent power and nanosecond temporal resolution. Optical frequencies from an ultrashort pulse mix, generating 3 mW of broadband terahertz.
A new model of auto-oscillations in high concentration erbium doped fiber laser has been developed with accounting for statistical nature of the excitation migration and upconversion, as well as resonance-like pump-to-signal intensity noise transfer.
Structuring the core of a photonic crystal fiber is used to fulfill the phase-matching condition required for broadband intermodal four-wave mixing. Experimental data show efficient red generation on LP01 mode from 1064 nm pumping.
Second-harmonic generation is demonstrated in periodically intermixed GaAs/AlGaAs superlattice waveguides by Type-II phase matching. Second-harmonic powers of 2.0 muW were generated at fundamental phase matching wavelength of 1577.4 nm.
We discuss design and tuning of second-harmonic generation in a GaAs microdisk. Quasi-phasematching is automatically achieved in a microdisk geometry, but efficient mixing requires resonating all waves, which leads to stringent tuning requirements.
Phase to frequency conversion is demonstrated with a synchronously modelocked optical parametric oscillator, with a sensitivity of 16 MHz/radian, and a phase resolution of 9ldr10-8 radian.
We present a novel technique to achieve both high efficiency and broad bandwidth in SFG process using adiabatic conversion scheme, adapted from NMR and light-matter interaction. The robustness and tunability of the scheme are discussed.
We report the demonstration of a single-longitudinal-mode 593.5-nm laser achieved via intracavity sum-frequency generation of a dual-wavelength cw Nd:YVO4 laser using two volume-Bragg-grating reflectors. >2.5-mW 593.5-nm orange light was obtained with this compact laser system.
A 100-nm comb of optical frequencies spaced by 400 GHz at 790 nm was obtained by second harmonic generation of an optical frequency comb produced by multiple four-wave-mixing in a highly nonlinear optical fiber.
We use low finesse Fabry-Perot cavities in series to generate frequency combs with large mode spacing by simultaneously maintaining high spectral bandwidth. The attenuation of laser modes closest to the pass band exceeds 70 dB relative to the modes centered within the pass band for a 5 GHz Fabry-Perot filtering a 250 MHz frequency comb.
We demonstrate a fast control of an octave-spanning fiber-based frequency comb with an intracavity electro-optic modulator. The servo bandwidth of both repetition and carrier-envelope offset frequency is greater than 200 kHz.
We report on the coherence measurement of the ultra-broad optical frequency comb generated in a hydrogen-filled square-lattice HC-PCF. The visibilities of higher order Stokes and anti-Stokes lines are quantified indicating a high degree of coherence.
An Yb-doped fiber laser and amplifier system is used together with an enhancement cavity for high harmonic generation for precision spectroscopy. Higher order harmonics can be produced in comparison to systems with Ti:sapphire lasers.
1-mum waveband, 12.5-Gbps transmission over a 1.5-km single-mode holey-fiber is demonstrated with clear eye-openings. A wavelength tunable single-mode selected quantum-dot optical frequency-comb laser is used as the optical-source potentially capable of wavelength division multiplexing (WDM).
We demonstrate all-optical intensity-dependent polarization switching, based on double phase-matched cascaded processes in a quadratic nonlinear photonic quasi-crystal. The efficiency is significantly better than that of devices based on cascaded cubic nonlinearities.
The frequencies of two frequency non-degenerate single photons were converted to the same frequency by using the sum frequency generation process in periodically poled lithium niobate waveguides, while maintaining their temporal indistinguishability. As a result, the two converted photons exhibited a non-classical dip in a Hong-Ou-Mandel quantum interference experiment.
We demonstrate a bright, bandwidth-engineerable, compact, quasi-phase-matched single-waveguide source generating photon pairs near 900 nm and 1300 nm. Coincidence spectra are measured for a periodically-poled KTiOPO4 waveguide for both type-0 and type-I spontaneous parametric down-conversion.
Multilayer walk-off corrected nonlinear crystal composites not only can correct the spatial walk-off, but also can compensate the phase-mismatching caused by incident angle deviation. The noncritical phase-matching-like properties can be engineered to all wavelengths.
A birefringent phase-matching scheme for difference frequency generation in a slotted air-clad waveguide with tunable gap width is proposed and theoretically analyzed. Tunability of 300 cm-1 and efficiency of 200 W-1cm-2 is predicted.
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