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


By John G. Webster (Editor)

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Linear flashlamps have a tubular quartz envelope with tungsten electrodes sealed at the ends. A shortduration high-voltage pulse applied to the electrodes results in intense emission over a large spectral range (Fig. 1). This is coupled to the dye solution by suitably designed enclosures with specular reflectors for imaging the lamp on the dye solution. The dye solution is flown through a cell made of fused silica at a fast speed for removal of heated dye solution between pump pulses. An important design consideration for these dye lasers is to minimize the risetime of the discharge pulses, which is limited by the impedance of the discharge.

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.

Moreover, IS ≡ σ0p Ip τ + 1 (σe + σ0 )τ is the saturation intensity that determines the extent of gain saturation by the laser, as is clear from the first term in Eq. (5). The increase of IS with pump intensity represents the fact that at higher pump intensities the molecules brought down to S0 will be recycled back to S1 at a faster rate; a higher laser intensity is then required to saturate the gain. Finally, the last term in Eq. (5), with σ σ τN S ≡ 0 12 σ0p Ip τ + 1 describes a nonlinear loss arising out of absorption of two laser photons by molecules from S0 and subsequently from S1 (13).

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