We report the generation of intense deep ultraviolet pulses at 200 nm with a duration of 48 fs and a pulse energy of 130 μJ,achieved via cascaded sum-frequency generation using 800 nm femtosecond pulses in barium bor...We report the generation of intense deep ultraviolet pulses at 200 nm with a duration of 48 fs and a pulse energy of 130 μJ,achieved via cascaded sum-frequency generation using 800 nm femtosecond pulses in barium borate crystals.Efficient frequency up-conversion is realized by optimizing phase-matching conditions and implementing dispersion control,while maintaining the ultrashort pulse characteristics.The generated deep ultraviolet pulses are characterized using two-photon absorption frequency-resolved optical gating,providing detailed insight into their temporal profile and phase.This approach addresses key challenges in ultrashort deep ultraviolet pulse generation,delivering a high-energy,ultrashort source suitable for ultrafast spectroscopy,nonlinear optics and strong-field physics.These results represent a significant advancement in the generation of high-energy,ultrashort deep ultraviolet pulses,opening up new possibilities for time-resolved investigations in ultrafast molecular dynamics,as well as emerging applications in semiconductor science,quantum materials and photochemistry.展开更多
We demonstrate the generation,spectral broadening and post-compression of second harmonic pulses using a thin beta barium borate(BBO)crystal on a fused-silica substrate as the nonlinear interaction medium.By combining...We demonstrate the generation,spectral broadening and post-compression of second harmonic pulses using a thin beta barium borate(BBO)crystal on a fused-silica substrate as the nonlinear interaction medium.By combining second harmonic generation in the BBO crystal with self-phase modulation in the fused-silica substrate,we efficiently generate millijoule-level broadband violet pulses from a single optical component.The second harmonic spectrum covers a range from long wave ultraviolet(down to 310 nm)to visible(up to 550 nm)with a bandwidth of 65 nm.Subsequently,we compress the second harmonic beam to a duration of 4.8 fs with a pulse energy of 0.64 mJ(5 fs with a pulse energy of 1.05 mJ)using chirped mirrors.The all-solid free-space apparatus is compact,robust and pulse energy scalable,making it highly advantageous for generating intense second harmonic pulses from near-infrared femtosecond lasers in the sub-5 fs regime.展开更多
文摘We report the generation of intense deep ultraviolet pulses at 200 nm with a duration of 48 fs and a pulse energy of 130 μJ,achieved via cascaded sum-frequency generation using 800 nm femtosecond pulses in barium borate crystals.Efficient frequency up-conversion is realized by optimizing phase-matching conditions and implementing dispersion control,while maintaining the ultrashort pulse characteristics.The generated deep ultraviolet pulses are characterized using two-photon absorption frequency-resolved optical gating,providing detailed insight into their temporal profile and phase.This approach addresses key challenges in ultrashort deep ultraviolet pulse generation,delivering a high-energy,ultrashort source suitable for ultrafast spectroscopy,nonlinear optics and strong-field physics.These results represent a significant advancement in the generation of high-energy,ultrashort deep ultraviolet pulses,opening up new possibilities for time-resolved investigations in ultrafast molecular dynamics,as well as emerging applications in semiconductor science,quantum materials and photochemistry.
文摘We demonstrate the generation,spectral broadening and post-compression of second harmonic pulses using a thin beta barium borate(BBO)crystal on a fused-silica substrate as the nonlinear interaction medium.By combining second harmonic generation in the BBO crystal with self-phase modulation in the fused-silica substrate,we efficiently generate millijoule-level broadband violet pulses from a single optical component.The second harmonic spectrum covers a range from long wave ultraviolet(down to 310 nm)to visible(up to 550 nm)with a bandwidth of 65 nm.Subsequently,we compress the second harmonic beam to a duration of 4.8 fs with a pulse energy of 0.64 mJ(5 fs with a pulse energy of 1.05 mJ)using chirped mirrors.The all-solid free-space apparatus is compact,robust and pulse energy scalable,making it highly advantageous for generating intense second harmonic pulses from near-infrared femtosecond lasers in the sub-5 fs regime.
