44.Photonics Technology by John G. Webster (Editor)
By John G. Webster (Editor)
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Additional info for 44.Photonics Technology
During the lasing process, the iodine atoms will experience many energy transfer excitation and stimulated emission cycles to extract most of the energy stored in O2(a 1⌬). A simplified kinetic mechanism that retains the essential features of the iodine dissociation process is provided in Table 2. A complete review of the gas-phase kinetics of the COIL was conducted in 1987 (11). The transverse injection of iodine into the throat of the supersonic mixing nozzle significantly complicates the iodine dissociation process, as discussed in Ref.
When such a pulse is incident on an optical diffraction grating, the various spectral components of the short pulse are spread spatially. By arranging a pair of optical gratings, the spatial separation is converted to an ordering of the spectral components in time. Under the proper set of circumstances, the chirped pulse output will have a duration of orders of magnitude (up to 100,000 demonstrated in the laboratory) larger than the original short pulse from the oscillator. The stretched pulse can be safely amplified without causing damage to the amplifier medium.
315 Ȑm. The spectrum is simulated using line shapes of Eq. (5) with a linewidth of ⌬D ϭ 840 MHz. The threshold for lasing (positive inversion) is achieved at T ϭ 295 K when the ratio of O2(a 1⌬) to total oxygen, or yield of singlet oxygen, is approximately 15%. The threshold is reduced considerably at lower temperatures due to the temperature dependence of the equilibrium constant. At T ϭ 160 K, a temperature consistent with typical nozzle exit conditions, the threshold yield is reduced to 5%.