Measurement of subpicosecond ultraviolet pulse widths by using the high-order nonlinear processes in a supersonic gas jet

Sakai, Hirofumi; Miyazaki, Kenzo; Kim, Gyu Ug

doi:10.1364/josab.9.002015

Cited by 8 publications

(2 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This technique for the UV pulse-width measurement was developed recently by the present authors [12]. We observed pulse-width narrowing in successive amplification.…”

Section: Introductionmentioning

confidence: 79%

High-order harmonic generation in rare gases with subpicosecond XeCl laser pulses

Miyazaki¹,

Sakai²,

Kim³

et al. 1994

Phys. Rev. A

Self Cite

View full text Add to dashboard Cite

A systematic study of the high-order harmonic generation in He, Ne, Ar, Kr, and Xe has been made using subpicosecond XeC1 laser pulses at a maximum laser intensity of 3.5 X 10' %/cm . The highest orders of harmonics observed are the 15th in He, the 13th in Ne, and the 9th in Ar, Kr, and Xe, and no broad plateau is formed in the harmonic distributions. The ultraviolet laser pulse, which has a large multiphoton ionization rate, was observed to induce a strong dielectric breakdown of the nonlinear medium at the high intensity. Multiphoton ionization and the subsequent dielectric breakdown of the medium are shown to have a significant inhuence on the harmonic-generation processes, as well as on the harmonic distribution. The laser-wavelength dependence of the high-order harmonic generation is discussed by comparing the results with those obtained by the subpicosecond visible dye-laser pulses.

show abstract

“…This technique for the UV pulse-width measurement was developed recently by the present authors [12]. We observed pulse-width narrowing in successive amplification.…”

Section: Introductionmentioning

confidence: 79%

High-order harmonic generation in rare gases with subpicosecond XeCl laser pulses

Miyazaki¹,

Sakai²,

Kim³

et al. 1994

Phys. Rev. A

Self Cite

View full text Add to dashboard Cite

show abstract

“…For example, the multiphoton ionization of a lowpressure gas in a static cell can be utilized as a nonlinear optical detector. 2 Pulse width measurements have also taken advantage of a two-photon absorption and subsequent fluorescence detection using a thick diamond plate. 3 A crosscorrelation signal arising from the multiphoton ionization of argon or helium in a supersonic jet has also been employed in pulse width measurements.…”

mentioning

confidence: 99%

Autocorrelator consisting of a solar-blind photomultiplier for use in the near-ultraviolet region

Ihara

Zaitsu

Imasaka

2005

Review of Scientific Instruments

View full text Add to dashboard Cite

The development of an autocorrelator based on a two-photon absorption of a photomultiplier photocathode is described. A solar-blind photomultiplier, sensitive in the far-ultraviolet region, is used to detect a two-photon absorption in the near-ultraviolet region. Such an autocorrelator can be used to measure the pulsewidth of a laser ͑396 nm, 110 fs͒ produced by the second harmonic generation of a Ti:sapphire laser.An ultrashort optical pulse has recently attracted the attention of researchers in the fields of spectroscopy and material processing. However, there is no established method for the measurement of the pulse width of a laser in the ultraviolet region. Although an autocorrelator based on frequency doubling using a nonlinear optical crystal is routinely used in the visible and near-infrared regions, no crystal is available that is transparent and which can be phase matched in the vacuum ultraviolet region. Therefore, an ultraviolet laser pulse is sometimes measured based on a third harmonic generation, although the efficiency is rather poor. 1 Several alternate approaches have been proposed to date for the measurement of the pulse width of the ultraviolet femtosecond laser. For example, the multiphoton ionization of a lowpressure gas in a static cell can be utilized as a nonlinear optical detector. 2 Pulse width measurements have also taken advantage of a two-photon absorption and subsequent fluorescence detection using a thick diamond plate. 3 A crosscorrelation signal arising from the multiphoton ionization of argon or helium in a supersonic jet has also been employed in pulse width measurements. 4 Unfortunately, these methods are somewhat complicated and are not convenient for use as a routine method. Thus, the development of an autocorrelator that is simple and easy to operate in laser pulse width measurements in the ultraviolet region would be desirable. Alternatively, a sensitive autocorrelator, based on the two-photon absorption of a photomultiplier photocathode, has been reported for such measurements in the near-infrared region. 5 This approach requires no phase matching and is easy to operate for use in routine work.In this study, we describe the construction of an autocorrelator consisting of a solar-blind photomultiplier, which is one-photon sensitive in the far-ultraviolet region, for measurement of a laser pulse width based on a two-photon absorption in the near-ultraviolet region.In order to evaluate the two-photon absorption of a photomultiplier photocathode, a Z-scan experiment, schematically shown in Fig. 1, was performed. In this experiment, the fundamental beam of a Ti:sapphire laser ͑Thales, 100 fs, 1 mJ, 1 kHz͒ is frequency doubled using a ␤-barium borate crystal ͑thickness, 1.6 mm͒ and is utilized as a laser source. The intensity of the laser can be changed roughly by inserting a neutral density filter and finely by rotating a polarizer. The laser power was monitored by means of a power meter ͑Molectron, PM10͒. The laser beam is focused by a lens with a focal length of 10 cm. The t...

show abstract

Investigation of soft X-ray emission from a gas puff target irradiated with a Nd:YAG laser

Fiedorowicz

Bartnik

Szczurek

et al. 1999

Optics Communications

View full text Add to dashboard Cite

Measurement of subpicosecond ultraviolet pulse widths by using the high-order nonlinear processes in a supersonic gas jet

Cited by 8 publications

References 20 publications

High-order harmonic generation in rare gases with subpicosecond XeCl laser pulses

High-order harmonic generation in rare gases with subpicosecond XeCl laser pulses

Autocorrelator consisting of a solar-blind photomultiplier for use in the near-ultraviolet region

Investigation of soft X-ray emission from a gas puff target irradiated with a Nd:YAG laser

Contact Info

Product

Resources

About