## Absorption of Laser Light and Radiation Damage in Semiconductors |

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absorption coefficient absorption due acoustic mode acoustic phonons approximately band gap bandedge cm v-sec conduction band consider constant contributes Conwell corresponding crystal density due to polar Ehrenreich elec electron energy electron hole electron phonon interaction electron relaxes ELEMENT FOR TRANSITIONS energy loss equation ev/cm excited exciton absorption formation of excitons free carrier absorption given gives harmonic oscillator HEAT EQUATION heating high energies HIGH FIELD TRANSPORT III-V compounds intermediate intervalley scattering intraband laser energy laser light lattice longitudinal optical phonons mobility occurs phonon field PHONON INTERACTION HAMILTONIAN PHONON MATRIX ELEMENTS PIEZOELECTRIC SCATTERING polar mode polar optical mode polar optical phonons pulse range of laser rate of energy reduced mass sample scat scattering electrons second quantization simple band symmetry temperature for damage tering thermal diffusion threshold energy threshold temperature tion transition probability transport processes tron TRON PHONON unit cell upper valley valence bands wave vector wlth