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50.Quantum Electronics by John G. Webster (Editor)

By John G. Webster (Editor)

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Example text

The first is that the minimum output linewidth can be much smaller as it is not limited by the Fourier transform of the output pulse shape. Second, homogeneous broadening of the gain profile of the dye is exploited to the best extent in CW dye lasers. Different wavelength components within the gain spectrum compete for the same overall gain available, and continue to do so, until the wavelength component that sees the maximum net gain (or minimum loss, as determined by the wavelength selective element in the cavity) grows faster and saturates the gain (Fig.

Emission, σ0 σ e, τ S0 R Figure 6. Conceptual depiction of potential energy curves and physical processes influencing laser action. Abbreviations and symbols are explained in text. Cross sections associated with the processes involved in the model discussed are designated by ␴ with appropriate subscripts. ␶ denotes the lifetime for spontaneous emission from the first excited singlet state S0. TR—thermal relaxation. DYE LASERS spacings typically one order of magnitude lower. Perturbation by solvent molecules further broadens these sublevels to form a quasi-continuum that gives rise to the broad absorption and emission spectra due to transition between the sublevels of different electronic states.

The strength of GSA at ␭l depends on the tail of the absorption band extending into the emission band. Although weak, the large concentration of dye molecules in the ground state makes its influence significant. GSA is responsible for a red shift of the peak of the gain spectrum from the peak of the fluorescence spectrum. The shift increases with increase in dye concentration and with decrease in pump power. Although a wide variety of pump sources with different wavelengths or with broad spectra may be used for pumping the same dye, use of pump sources with ␭p close to the longest-wavelength absorption band reduces loss of photon energy (h␯p Ϫ h␯l) by internal conversion and vibrational relaxation.

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