Using a ray matrix method, we analyze theoretically how the r and theta polarizations affect the resonator stability condition of two laser heads with or without thermal birefringence compensation. The resonator stability condition is analyzed graphically for a plane-parallel and a concave-concave resonator. The maximum range of stable region is found for both the short and the long cavity. The characteristics of the laser output power are confirmed experimentally in association with the resonator stability condition. The laser output power of 776 W is obtained with the optical-to-optical efficiency of 45% for a plane-parallel resonator with a short crystal separation.
The interface formed at aluminum (Al) and poly(3-alkylthiophene) (P3AT) has been studied using bias dependent photoluminescence (PL) quenching in indium tin oxide (ITO)/P3AT/Al sandwiched cells. Different types of bias dependent PL quenching patterns were obtained by varying the alkyl chain length and the regioregularity of the P3AT. Observed results indicate that the PL quenching and depletion layer are strongly correlated to the morphology in these P3AT films. Further, it has also indicated about the spatial charge carrier distribution in these films. Moreover by changing the alkyl chain length a complete trend reversal was obtained between the PL quenching and the Mott-Schottky plot of these cells. These results have been explained on the basis of Field induced PL quenching in these films.
A ray-tracing code has been developed, and the design parameters of the laser pump head were analyzed in terms of crystal diameter, doping concentration, and optical cavity diameter. According to the numerical analysis, we fabricated an efficient diode-pumped Nd:YAG laser and experimentally obtained 500-W output power. The output power is close to the numerically calculated output power of approximately 450 W and corresponds to an optical-to-optical conversion efficiency of 46.7% and an optical slope efficiency of 49%.
We fabricated and analyzed the output power and polarization characteristics of an efficient diode-side-pumped Nd:YAG rod laser with a diffusive optical cavity. The resonator stability conditions are analyzed graphically in the symmetric and asymmetric configurations for a plane-parallel resonator. On the basis of an analysis of the stability condition and mode size for the r and theta polarizations, we clarify how the stable laser operation is possible for various resonator configurations. In particular, we show that the critical stability region of around g1*g2* = 0 provides a stable resonator in the symmetric resonator, even with a slight asymmetry. Experimentally, the output power and polarization characteristics are confirmed in association with the resonator stability condition.
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