Measurements of cesium mixing and quenching cross sections in methane gas: understanding sources of heating in cesium vapor lasers.
Measurements of cesium mixing and quenching cross sections in methane gas: understanding sources of heating in cesium vapor lasers.
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甲烷气体中铯混合和淬火截面的测量：了解铯蒸气激光器的热源。
DOI：
10.1364/oe.27.009676
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发表时间：
2019
期刊：
影响因子：
3.8
通讯作者：
J. Sell
中科院分区：
文献类型：
--
作者：
M. Gearba;P. Rich;L. A. Zimmerman;M. Rotondaro;B. Zhdanov;R. Knize;J. Sell
二极管泵浦碱金属激光器工作过程的精确建模是设计高功率器件的关键一步。精确测量了Cs-CH_4 ~（62）P_（3/2）→ ~（62）P_（1/2）混合截面和~（62）P_（3/2，1/2）→ ~（62）S_（1/2）猝灭截面，这两个截面是理解铯蒸气激光器工作过程，特别是产生的热量的重要参数。测量进行了使用超快激光脉冲激发和观察荧光由于碰撞激发转移的时间是使用时间相关的单光子计数技术。在10 - 40托的甲烷压力下获得混合速率测量，得到Cs-CH 4 62 P3/2 → 62 P1/2混合截面为（1.40 ± 0.08）× 10-15 cm ~ 2，在甲烷压力为500 - 4000 Torr时测量猝灭速率，得到62 P ~（3/2），1/2 → 62 S1/2淬火截面为（1.57 ± 0.03）× 10-18 cm 2。这些结果表明，只有一个轻微的贡献，铯蒸气激光器的加热是由于Cs 62 P淬火，与以前的研究相反。我们还讨论了额外的可能来源的能量转移从上激发态的Cs。
Accurate modeling of the operation of diode-pumped alkali lasers is a critical step toward the design of high-powered devices. We present precision measurements for the Cs-CH4 62P3/2 → 62P1/2 mixing cross section and the 62P3/2,1/2 → 62S1/2 quenching cross section, which are important parameters in understanding the operation and, in particular, the heat generated in a cesium vapor laser. Measurements are carried out using ultrafast laser pulse excitation and observation of fluorescence due to collisional excitation transfer in time is done using the technique of time-correlated single-photon counting. Mixing rate measurements are acquired over methane pressures of 10 - 40 Torr, resulting in a Cs-CH4 62P3/2 → 62P1/2 mixing cross section of (1.40 ± 0.08) × 10-15 cm2, while quenching rate measurements are carried out over methane pressures of 500 - 4000 Torr, resulting in a 62P3/2,1/2 → 62S1/2 quenching cross section of (1.57 ± 0.03) × 10-18 cm2. These results suggest only a slight contribution to the heating of a cesium vapor laser is due to Cs 62P quenching, contrary to previous studies. We also discuss additional possible sources of energy transfer from upper excited states of Cs.