Abstract
A diode-pumped alkali laser (DPAL) provides the significant promise for high-powered performances. In this paper, a mathematical model is introduced for examination of the kinetic processes of a diode-pumped cesium vapor hollow-core photonic-crystal fiber (HC-PCF) laser, in which the cesium vapor is filled in the center hole of a photonic-bandgap fiber instead of a glass cell. The influence of deleterious processes including energy pooling, photo-ionization, and Penning ionization on the physical features of a fiber DPAL is studied in this report. It has been theoretically demonstrated that the deleterious processes cannot be ignored in a high-powered fiber-DPAL system.
Highlights
In the recent years, a diode-pumped alkali laser (DPAL) has been extensively studied due to the potential for its excellent physical features[1,2,3]
In 2006, Payne et al proposed a patent describing a new kind of DPAL in which a hollow-core photonic-crystal fiber (HC-PCF) is used as the vapor container[7]
Sintov et al calculated the physical features of a rubidium vapor-based fiber laser using a simple mathematical model, in which the HC-PCFDPAL was treated as a three-level laser system[9]
Summary
A diode-pumped alkali laser (DPAL) has been extensively studied due to the potential for its excellent physical features[1,2,3]. The electrons in cesium atoms are pumped from the 62 S1/2 level to the 62 P3/2 level corresponding to the D2 line. Under the condition of high-powered pump, the electrons will be excited to the higher levels (62 D5/2,3/2 and 82 S1/2) by energy pooling collisions. To deeply study the kinetics of an HC-PCF-DPAL, we construct a quasi-five-level model with the cesium vapor as a gain medium in this report. The influences of energy pooling, Penning ionization and Photo-ionization on the output features of a DPAL are evaluated. To the best of our knowledge, there have not been any similar reports about a diode-pumped cesium vapor HC-PCF laser
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