Fig. 1: Optical layouts of the CPL spectrometers.
From: Rapid time-resolved Circular Polarization Luminescence (CPL) emission spectroscopy
Circles with arrows represents circularly polarised light; vertical and horizontal arrows represent linearly polarised light. a SM-CPL spectrometer. Laser driven light source. SM(A) = excitation scanning monochromator; PEM = photoelastic modulator (effectively acting an electrically switched variable quarter wave plate operating at radio frequencies); LP = linear polariser; SM(B) emission scanning monochromator; PD = photodiode. b SS-CPL spectrometer. LED = light emitting diode (emission peak at 365 nm); <400 nm = short pass filter; QWP = quarter wave plate; 50/50 BS = 50/50 non-polarising beam splitter; LP = linear polariser; >450 nm = long pass filter; SS spectrometer = solid state CCD spectrometer.
