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Circularly Pockels cell

In a typical modern ROA instrument, a linearly polarized laser beam is directed through a Pockels cell, which renders the beam circularly polarized. With a frequency of a few hertz the exciting radiation is switched between right circularly and left circularly polarized and focused onto the sample. In the latest spectrometers the Raman effect is observed in the so-called 180° or backscattering arrangement. This method of observation is achieved by drilling a... [Pg.791]

The incident (absorption) beam is wavelength-selected by an excitation monochromator and then converted to alternately left and right circular polarization by use of a linear polarizer and quarter-wave modulator. The quarter-wave modulator may be a PEM as described above for CPL measurement, or a Pockels cell. This luminescence in phase with the incident polarization modulation is collected by two photomultiplier tubes (PMTl and PMT2) oriented at right angles to each other and the incident beam. If the excitation is linearly polarized, then the sum of... [Pg.326]

See other pages where Circularly Pockels cell is mentioned: [Pg.343]    [Pg.180]    [Pg.9]    [Pg.18]    [Pg.22]    [Pg.35]    [Pg.38]    [Pg.42]    [Pg.49]    [Pg.50]    [Pg.224]    [Pg.343]    [Pg.4]    [Pg.184]    [Pg.186]    [Pg.64]    [Pg.191]    [Pg.9]    [Pg.275]    [Pg.613]    [Pg.102]    [Pg.262]    [Pg.263]    [Pg.271]    [Pg.283]    [Pg.334]    [Pg.598]    [Pg.164]    [Pg.304]   
See also in sourсe #XX -- [ Pg.9 , Pg.18 , Pg.22 , Pg.26 , Pg.35 , Pg.42 , Pg.49 , Pg.225 ]



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