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The advantages of three-color pump beam configuration in four-wave Raman mixing was investigated. We generated femtosecond pulses at 185 nm with an energy of about 400 nJ, which is about 8% of the probe pulse energy.
A cross-correlation frequency-resolved optical gating is developed for the characterization of an optical pulse train consisting of monocycle pulses. An optical beat is employed for resolving the ultrafast temporal intensity variation in the train.
Four-wave mixing in air is employed for the generation of energetic multicolor femtosecond pulses. After the subsequent propagation in air, the multicolor emissions are phase locked to each other to form intense subcycle laser pulses.
The laser pulse width was measured on-site the mass spectrometer by scanning a dispersion in the pulse compressor. A pulse width of 49 fs measured was close to 35 fs calculated from the spectrum.
A frequency-resolved optical gating (FROG) that simultaneously acquires two secondharmonic-generation FROG traces and a cross-correlation FROG trace is reported. This FROG allows robust and reliable characterization of two unknown pulses.
The novel scheme for lightwave modulation based on ultrafast modulation of polarizability induced by a coherently excited molecular motion has attracted attention as an alternative to a widely-used optical modulator based on an electro-optic effect to extend it to much higher frequency. A pulsed laser was first used to demonstrate the feasibility of this approach [1], and recently a cavity enhanced...
Four-wave optical parametric amplification in a gas allows amplification of an octave-spanning supercontinuum. As a proof-of-principle experiment, amplification of a continuum in a spectral range of 520–700 nm with a gain exceeding thirty is demonstrated.
A two-color pump beam (401 and 481 nm) was used for molecular phase modulation of hydrogen to enhance stimulated Raman scattering for efficient frequency conversion into the entire visible/ultraviolet region.
Dioxins contained in the soil was measured by means of multiphoton ionization mass spectrometry using a femtosecond laser. By a combination with gas chromatography, congeners of dioxins were determined at femtogram levels.
Tetraazacrown was useful for measuring a >1.6-fs pulse in the ultraviolet region and aliphatic hydrocarbon for a >0.96-fs pulse in the far-ultraviolet region using an autocorrelator consisting of a mass spectrometer as a two-photon-response detector.
A continuous-wave multicolor laser with wavelengths of 436, 532 and 683 nm is developed. These lines are generated through stimulated Raman scattering and Raman-resonant four-wave mixing in hydrogen molecules in a broadband optical cavity.
The frequency of a continuous-wave laser was converted via high-order stimulated Raman scattering and four-wave Raman mixing in a high-finesse optical cavity. The threshold for the generation of a Stokes beam was determined by the Raman gain coefficient and the loss in the cavity. The intracavity power of the second-order Stokes beam increased with an increase in pump power, whereas the power of the...
The phase-matched intracavity four-wave mixing is controlled by the total dispersion of the optical cavity. Continuous-wave Raman sidebands are generated through three different pathways depending on the phase-matching conditions.
A continuous-wave laser is amplified in a hollow-core photonic crystal fiber containing molecular hydrogen. The laser power was amplified 1.3-fold, and the effect of beam polarization for pump and probe lasers is investigated.
We demonstrate highly efficient continuous-wave-based four-wave mixing beyond a small signal approximation. This is achieved in a high-finesse cavity with controlled dispersion for phase-matched interaction.
A continuous-wave laser is amplified in a hollow-core photonic crystal fiber containing molecular hydrogen. The laser power was amplified 1.3-fold, and the effect of beam polarization for pump and probe lasers is investigated.
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