By Rudolf Kingslake
A booklet of this grade is usually good stored and is more healthy to learn and shop. good backbone, all pages intact bodily. sturdy disguise. may have appropriate shelve put on. may have appropriate restricted notes. Exlibrary booklet.
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Also, it is usually the case that uA << 4nn. Solving Eqs. (55) to (59) with these approximations gives the following expressions for free carrier absqption and refraction: afc((n)= R2Ne3 4n2c3nocom~ffp and n“(A) = - A2Ne2 8n2c2noeomeff where the scattering time r has been replaced with the carrier mobility R2 dependence for both quantities suggests that these free carrier effects are more important at longer wavelengths. z 1 to 10pm). The wavelength dependence is also not quite correct. 5. The deviation from the A2 dependence can be understood as arising from a frequency-dependent carrier scattering time T, with the value of p depending on the scattering mechanisms (Seeger, 1991).
The solid lines are fits. 1 RESONANT OPTICAL NONLINEARITIES IN SEMICONDUCTORS 23 be measured accurately, the values obtained from the Kramers-Kronig relation are a better estimate of An. The measurements from fringe shift support the validity of the indirect procedure using the Kramers-Kronig relation. d. Modeling The carrier-density-dependent absorption was fit with a single saturation term plus a term corresponding to unsaturating background (Eq. 13). The saturation density N,,, was smallest for the material with 150-8, wells.
7. The low-intensity, room-temperature absorption for the five multiple quantum well samples. 1 RESONANTOPTICAL NONLINEARITIE~ IN SEMICONDUCTORS 19 respectively. The splitting of the energy for light- and heavy-hole transitions is another consequence of quantum confinement. For the wider, less confining wells, the light- and heavy-hole excitons have nearly the same energy and cannot be resolved separately. The notation n = 1, n = 2, etc. refers to transitions between the n = 1 hole subband and the n = 1 electron subband, etc.