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H. SASADA AND K. SUZUMURA, Department of Physics, Faculty of Science and Technology, Keio University, Yokohama 223, Japan.
Saturation spectroscopy of the 2
3 band of methane was carried out using an optical cavity absorption cell and a 1.6-µm-grating feedback external-cavity semiconductor laser. An experimental setup was similar with the pioneering work in the 1.5-µm region. Since the linewidth of the observed saturation dips was just 0.5 MHz, a high potential exists for the use of this technique for high resolution spectroscopy and double-resonance spectroscopy.