D Frohlich and M Sondergeld 1977 J. Phys. E: Sci. Instrum. 10 761 doi:10.1088/0022-3735/10/8/002
D Frohlich and M Sondergeld
Show affiliationsA historical outline of two-photon spectroscopy traces the different motivations for this kind of nonlinear optical experiment. Different selection rules as compared to linear optical effects (one-photon absorption), the possibility of spectroscopy in omega -K space and Doppler-free absorption in gases open up a wide field of useful applications of this technique. A rough estimate of the expected magnitude of the two-photon absorption constant clearly indicates the sort of experimental equipment necessary. Detailed descriptions of a single-beam and a dual-beam set-up follow. Finally a short description of an indirect method, namely the detection of two-photon absorption by subsequent luminescence, and some remarks on future developments are presented.
85.60.Ha Photomultipliers; phototubes and photocathodes
42.60.Jf Beam characteristics: profile, intensity, and power; spatial pattern formation
07.57.Ty Infrared spectrometers, auxiliary equipment, and techniques
Issue 8 (August 1977)
D Frohlich and M Sondergeld 1977 J. Phys. E: Sci. Instrum. 10 761
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