Amplifiers – Parametric amplifiers – Semiconductor type
Patent
1982-06-29
1985-07-16
Moskowitz, Nelson
Amplifiers
Parametric amplifiers
Semiconductor type
350359, 307428, H03F 700, H01S 300
Patent
active
045299447
ABSTRACT:
Carbon Monoxide vapor is used to generate coherent, tunable vacuum ultraviolet radiation by third-harmonic generation using a single tunable dye laser. The presence of a nearby electronic level resonantly enhances the nonlinear susceptibility of this molecule allowing efficient generation of the vuv light at modest pump laser intensities, thereby reducing the importance of a six-photon multiple-photon ionization process which is also resonantly enhanced by the same electronic level but to higher order. By choosing the pump radiation wavelength to be of shorter wavelength than individual vibronic levels used to extend tunability stepwise from 154.4 to 124.6 nm, and the intensity to be low enough, multiple-photon ionization can be eliminated. Excitation spectra of the third-harmonic emission output exhibit shifts to shorter wavelength and broadening with increasing CO pressure due to phase matching effects. Increasing the carbon monoxide pressure, therefore, allows the substantial filling in of gaps arising from the stepwise tuning thereby providing almost continuous tunability over the quoted range of wavelength emitted.
REFERENCES:
patent: 4107544 (1978-08-01), Kildal et al.
"Three-Photon Excitation of Xenon and Carbon Monoxide", by F. H. M. Faisal, . Wallenstein and H. Zacharias, Phys. Rev. Letters 39, 1138, (1977).
"Four-Wave Sum Mixing (130-180 nm) in Molecular Vapors", by K. K. Innes, B. P. Stoicheff and S. C. Wallace, Appl. Phys. Letters 29, 715, (1976).
"Nonlinear Laser Spectroscopy in Nitric Oxide Studied Through VUV Harmonic Generation", by S. C. Wallace and K. K. Innes, J. Chem. Phys., 72, 4805, (1980).
"Third-Harmonic Generation Using an Ultrahigh-Spectral Brightness ArF* Source", by H. Pummer, T. Srinivasan, H. Egger, K. Boyer, T. S. Luk, and C. K. Rhodes, Optics Letters 7, 93, (1982).
"Resonantly Enhanced Multiphoton Ionization and Third-Harmonic Generation in Xenon Gas", by J. C. Miller, R. N. Compton, M. G. Payne and W. W. Garrett, Phys. Rev. Letters 45, 114, (1980).
"Resonantly Enhanced Vacuum Ultraviolet Generation and Multiphoton Ionization in Carbon Monoxide Gas", by J. H. Glownia and R. K. Sander, Appl. Phys. Letters 40, 648, (1982).
Glownia James H.
Sander Robert K.
Freund Samuel M.
Gaetjens Paul D.
Hightower Judson R.
Moskowitz Nelson
The United States of America as represented by the Department of
LandOfFree
Resonantly enhanced method for generation of tunable, coherent v does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Resonantly enhanced method for generation of tunable, coherent v, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Resonantly enhanced method for generation of tunable, coherent v will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1738220