Generation of vacuum-ultraviolet radiation inby nonlinear optical processes near theEF- andB-state resonances
- 1 December 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 44 (11), 7530-7546
- https://doi.org/10.1103/physreva.44.7530
Abstract
We report on the observation of several nonlinear optical processes in connection with two-photon excitation of by 193-nm radiation generated by a narrow-bandwidth ArF laser system: stimulated electronic hyper-Raman scattering, parametric four-wave mixing (PFWM), and stimulated resonant Raman scattering (SRRS). These processes lead to the generation of several intense lines in the ir and vacuum ultraviolet (vuv). vuv generation occurs by two interconnected schemes: first, a vuv wave at λ∼109 nm is generated by PFWM (power up to 16 kW). This wave subsequently generates Stokes lines around λ∼150 nm by SRRS. The frequencies of these waves are tunable over spectral intervals of ∼20 by phase matching with admixture of various gases (e.g., noble gases, , ). With additional irradiation of ir laser radiation, four-wave mixing (FWM) takes place. In this case, continuously tunable vuv radiation (tuning range ∼600 ) can be generated with power in the 10- and 100-kW range. The tuning ranges are localized around the rovibronic resonances X-B. FWM is not possible on resonance. As in the case of PFWM, Stokes lines are generated by SRRS, tunable over intervals up to ∼60 . The susceptibilities governing the processes involved are calculated. The agreement between the theoretical expectations and the experimental results is very good with respect to the frequency dependence. The calculated absolute values of the vuv intensities, however, turn out to be by far too high. This is due to the neglect of several limiting processes which will be discussed together with the experimental results. In addition to the processes mentioned above, several B-X resonance transitions exhibit a limited tunability (∼10 ). It is proposed to explain this tunability in terms of stimulated two-photon emission.
Keywords
This publication has 34 references indexed in Scilit:
- Observation of unexpected energy levels in molecular hydrogen and ortho-para energy transferPhysical Review Letters, 1990
- Observation of stimulated hyper-Raman scattering inH2Physical Review A, 1989
- Two-photon excitation and excited-state absorption cross sections forE,F(v=6): Measurement and calculationsPhysical Review A, 1989
- Suppression of electronic hyper-Raman emission by four-wave mixing interferenceOptics Communications, 1988
- Vacuum ultraviolet laser spectroscopy III: laboratory sources of coherent radiation tunable from 105 to 175 nm using Mg, Zn, and Hg vaporsCanadian Journal of Physics, 1985
- Vacuum-ultraviolet stimulated emission from two-photon-excited molecular hydrogenPhysical Review A, 1983
- Generation of extreme ultraviolet radiation at 79 nm by sum frequency mixingIEEE Journal of Quantum Electronics, 1983
- Observation of Two-Photon Excitation of the,StatePhysical Review Letters, 1978
- Tunable Coherent Vacuum-Ultraviolet Generation in Atomic VaporsPhysical Review Letters, 1974
- Band oscillator strengths and transition probabilities for the Lyman and Werner systems of H2, HD, and D2Atomic Data and Nuclear Data Tables, 1969