RESONANCE-ENHANCED SUM-FREQUENCY GENERATION OF XUV RADIATION IN CO
Resonance-enhanced sum-frequency generation of XUV radiation is observed for the first time in a molecular gas. Two laser frequencies are mixed in a pulsed free jet of carbon monoxide. The first laser is two-photon resonant with the Q-branch of the C1Σ+-X1Σ+ transition, while the second laser is tun...
| Main Authors: | , |
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| Format: | Journal article |
| Language: | English |
| Published: |
1990
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| Summary: | Resonance-enhanced sum-frequency generation of XUV radiation is observed for the first time in a molecular gas. Two laser frequencies are mixed in a pulsed free jet of carbon monoxide. The first laser is two-photon resonant with the Q-branch of the C1Σ+-X1Σ+ transition, while the second laser is tuned so that the sum frequency 2ν1 + ν2 is also resonant with various Rydberg state transitions in the range 107070-109310 cm-1. A spectrum is obtained by monitoring the sum-frequency intensity versus the frequency of the second laser. Rotational constants are obtained for four states and the intensity profiles show some remarkable effects of competition between four-wave mixing and reabsorption of the sum frequency. © 1990. |
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