Huang-Rhys electron-phonon coupling paramete

Huang-Rhys electron-phonon coupling parameter (5q) values for various active centers... 

The term pS represents the average number of modes involved in the jump. Following Ttyozawa (1967), Sq (the Huang-Rhys coupling parameter, Huang and Rhys 1950), which is directly linked to the amount by which the normal coordinates are displaced by the electron-phonon coupling, can be viewed also as the number of phonons emitted or absorbed in the transition. It is then possible to write pS=So, and eq. (135) can be written as... 

A host material is activated with a certain concentration of Ti + ions. The Huang-Rhys parameter for the absorption band of these ions is 5 = 3 and the electronic levels couple with phonons of 150 cm . (a) If the zero-phonon line is at 522 nm, display the 0 K absorption spectrum (optical density versus wavelength) for a sample with an optical density of 0.3 at this wavelength, (b) If this sample is illuminated with the 514 nm line of a 1 mW Ar+ CW laser, estimate the laser power after the beam has crossed the sample, (c) Determine the peak wavelength of the 0 K emission spectrum, (d) If the quantum efficiency is 0.8, determine the power emitted as spontaneons emission. 

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