Generation of narrowband tunable VUV radiation
Nonresonant sum- and difference-frequency mixing of the fundamental (omega/sub L/) and the second harmonic (omega/sub uv/) output of a powerful narrowband pulsed dye laser excited by a Nd-YAG laser has been investigated in Xe and Kr. The sum-frequency omega /sub vuv/ = 2omega/sub uv/ + omega/sub L/ is tunable in spectra regions of negative dispersion between 110 nm, and 130 nm. The maximum VUV pulse power exceeds 20 W (5 x 10/sup 10/ photons/pulse). The difference frequency omega/sub vuv/ = 2omega/sub uv/ - omega/sub L/ provides VUV light pulses with up to 60 W (2.3 x 10/sup 11/ photons/pulse) at wavelengths between 185 nm and 207 nm. Coherent VUV light of shorter wavelength (159.5 nm to 186.6 nm) is obtained by mixing the UV dye laser radiation with the infrared output (omega/sub IR/) of the Nd-YAG laser (omega/sub VUV/ = 2omega/sub uv/ - omega/sub IR/). With UV light of shorter wavelength (omega/sub uv'/ = omega/sub uv/ + omega/sub IR/) the difference frequency conversions omega/sub vuv/ = 2omega/sub uv'/ - omega/sub L/ and omega/sub vuv/ = 2omega/sub uv'/ - omega/sub IR/ allow the generation of VUV light with wavelengths between 122.6 nm and 160 nm. Thus with a single dye laser which is operated in the most efficient operating range of Nd-YAG laser pumped dye lasers (omega/sub L/ = 550 - 670 nm) the investigated conversion schemes generate intense coherent VUV light which is continuously tunable between 110 nm and 210 nm. Besides the nonresonant frequency conversion two-photon resonant frequency mixing has been studied in detail in Xe and Hg. In these experiments the resonant enhancement of the nonlinear processes increased the VUV pulse power to values in the range of 0.5 to 10 KW.
- Research Organization:
- Universitaet Bielefeld, West Germany
- OSTI ID:
- 5157625
- Report Number(s):
- CONF-820336-
- Journal Information:
- AIP Conf. Proc.; (United States), Vol. 90; Conference: Optical Society of America topical meeting on laser techniques for extreme ultraviolet spectroscopy, Boulder, CO, USA, 8 Mar 1982
- Country of Publication:
- United States
- Language:
- English
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