Abstract
One of the most powerful spectroscopic techniques available for the measurement of weak absorption is the use of frequency modulation of the source complemented by phase sensitive detection. This approach is highly effective in separating the interesting narrow resonance features from the broad background profile. While optimum amplitude of the frequency modulation leads to recovery of nearly the full signal component, it also leads to broadened resonance profiles which are not immediately related to the physical resonances of interest. Furthermore, it is attractive to employ high modulation frequencies to take advantage of the nearly universal situation that one finds experimentally, namely the concentration of excess noise toward low frequencies. Ultimately then, the resonance profiles of interest are further “distorted” by the modulation process when the modulation frequency is comparable to the resonance width. This constraint is particularly painful in contemporary ultrahigh resolution optical experiments when the measured lines may only be of ~ kiloHertz width.
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References
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© 1983 Plenum Press, New York
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Hall, J.L., Robinson, H.G., Baer, T., Hollberg, L. (1983). The Lineshapes of Subdoppler Resonances Observable with FM-Side-Band (Optical Heterodyne) Laser Techniques. In: Arecchi, F.T., Strumia, F., Walther, H. (eds) Advances in Laser Spectroscopy. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-3715-7_4
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DOI: https://doi.org/10.1007/978-1-4613-3715-7_4
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