Resonantly enhanced method for generation of tunable, coherent vacuum-ultraviolet radiation
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 no 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.
- DOE Contract Number:
- W-7405-ENG-36
- Assignee:
- EDB-83-077576
- Patent Number(s):
- None
- Application Number:
- ON: DE83010516
- OSTI ID:
- 6334879
- Country of Publication:
- United States
- Language:
- English
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Resonantly enhanced method for generation of tunable, coherent vacuum ultraviolet radiation
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Related Subjects
420300* -- Engineering-- Lasers-- (-1989)
CARBON MONOXIDE LASERS
DESIGN
DYE LASERS
ELECTROMAGNETIC RADIATION
ENERGY-LEVEL TRANSITIONS
EXCITATION
FAR ULTRAVIOLET RADIATION
GAS LASERS
LASERS
LIQUID LASERS
MULTI-PHOTON PROCESSES
OPERATION
OPTICAL PUMPING
PLASMA DIAGNOSTICS
PRESSURE DEPENDENCE
PUMPING
RADIATIONS
TUNING
ULTRAVIOLET RADIATION