Showing papers on "Supercontinuum published in 1992"
TL;DR: The design and operation characteristics of a low-Q cavity dye laser chain pumped by a single laser for generating high-power tunable subpicosecond pulses are presented and spectral and time processes involved in these pulse-shortening methods are discussed with a rate-equation model.
Abstract: The design and operation characteristics of a low-Q cavity dye laser chain pumped by a single laser (seeded Nd:YAG) for generating high-power tunable subpicosecond pulses are presented. Two low-Q short dye cavities in cascade pumped well above threshold followed by extracavity pulse shaping in a highly saturated absorber and amplifiers lead to stable generation of single 500-fs pulses, i.e., a pulse-shortening factor > 104 (from a smooth 6-ns pump pulse). Output pulse energies of 500 μJ (1-GW peak power) are produced from 40-mJ pump energy and used to generate high-power tunable subpicosecond pulses from 450 to 700 nm by supercontinuum generation, spectral selection, and amplification in dye amplifiers pumped by the same Nd:YAG laser. The spectral and time processes involved in these pulse-shortening methods are discussed with a rate-equation model.
52 citations
TL;DR: In this paper, the time-domain characteristics and spectral distribution of an intense femtosecond pulse with its center frequency in the anomalous group-velocity dispersion region, propagating in a one-spatial-dimension Kerr medium (optical fiber), were derived.
Abstract: We compute numerically the time-domain characteristics and the spectral distribution of an intense femtosecond pulse with its center frequency in the anomalous group-velocity dispersion region, that is, propagating in a one-spatial-dimension Kerr medium (optical fiber). We include in our calculations the effects of self-phase modulation, self-steepening, group-velocity dispersion, higher-order dispersion [β(3) term], and Raman scattering. We explicitly show the contributions of the different terms.
21 citations
TL;DR: In this article, an experiment on the supercontinuum generation in high pressure CO2 (1-40 atm) by weakly focused 1 ps pulses at 593 nm is described.
Abstract: An experiment on the supercontinuum generation in high pressure CO2 (1-40 atm) by weakly focused 1 ps pulses at 593 nm is described. While changing the gas pressure and the laser power, the authors observed self-focusing and optical breakdown in the gas. They studied the evolution of the supercontinuum spectral width and efficiency after self-focusing. Their results show that: (i) the spectral width of the supercontinuum spectrum before optical breakdown can be explained in terms of self-phase modulation by only taking into account the cubic non-linearity of the gas and the increased laser intensity due to self-focusing; (ii) the plasma contribution to the supercontinuum generation was, in their experiment, a self-limiting type, owing to the shortening of the interaction length as the electron density increased.
16 citations
TL;DR: In this paper, self-phase modulation in a single-mode fiber is used to produce broadband femtosecond laser pulses, synchronized with the output of an amplified colliding-pulse-modelocked (CPM) laser.
7 citations
TL;DR: In this paper, a low-Q cavity dye laser was used as a pump source to obtain high-energy sub-100 femtosecond (femTosecond) pulses at a fixed wavelength.
Abstract: Subpicosecond pulses at a fixed wavelength produced with a low-Q cavity dye laser pumped by a single, nanosecond laser (Q-switched Nd:YAG) are converted into tunable high-power sub-100 femtosecond pulses by generation, spectral selection, amplification and compression of a supercontinuum. The tunable, chirped, high-energy pulses obtained are compressed with a prism pair. Energies up to 50 μJ in sub-100 fs pulses were obtained in the 540 to 650 nm range using 40 mJ of the Nd: YAG-laser pumping pulses at 532 nm. The whole sub-100 fs system including the low-Q dye laser uses only one Nd:YAG laser as a pump source.
4 citations