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Optics Communications

Standing-wave and intensity effects in intracavity laser RF double resonance spectroscopy

Ramon A. Vilaseca, Jaume Pujol

Published Feb 1, 1988• 2 citations
Publisher
DOI
10.1016/0030-4018(88)90350-1

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In the early days of laser spectroscopy, Letokhov and Chebotayev proposed a scheme for measuring narrow spectral lines where the resolution is not restricted to Doppler effects because the molecules are entrained in a standing-wave light field. Now, such one-dimensional trapping in the intensity maxima of an intracavity field, slightly detuned from resonance, is experimentally demonstrated in the measurement of the very weak S(0) (2-0) quadrupole overtone transition in H_{2} at 1189 nm. The trapping manifests as an extremely narrow absorption feature at the predicted zero-recoil position, a 70 kHz shift from the blue-recoil component observed in Lamb-dip spectroscopy. A quantitative analysis of the saturation and trapping conditions supports the findings.
Abstract A novel technique to visualize RF waves in the gigahertz frequency range based on the double resonance spectroscopy of cesium-133 atoms is developed. This technique allows one to obtain fluorescence at a near-infrared wavelength of 852 nm, which can be detected by a charge-coupled device camera. The fluorescence depends on the strength distribution of 9.2 GHz RF waves. This method realizes real-time, high-resolution imaging using RF waves. In this study, the visualization of RF waves on a microstrip line is demonstrated and RF standing waves are clearly observed. The sensitivity of the visualization to the input power and phase shift of the RF standing waves arising from a particular condition of the reflection waves are investigated.