Yacoby Eyal, Waichman Karol, Sadot Oren, Barmashenko Boris D, Rosenwaks Salman
Opt Express. 2016 Mar 7;24(5):5469-5477. doi: 10.1364/OE.24.005469.
We examine transonic diode pumped alkali laser (DPAL) devices as a simpler alternative to supersonic devices, suggested by B.D. Barmashenko and S. Rosenwaks [Appl. Phys. Lett. 102, 141108 (2013)], where complex hardware, including supersonic nozzle, diffuser and high power mechanical pump, is required for continuous closed cycle operation. Three-dimensional computational fluid dynamics modeling of transonic (Mach number M ~0.9) Cs and K DPALs, taking into account the kinetic processes in the lasing medium is reported. The performance of these lasers is compared with that of supersonic (M ~2.5) and subsonic (M ~0.2) DPALs. For Cs DPAL the maximum achievable power of transonic device is lower than that of supersonic, with the same resonator and Cs density at the laser section inlet, by only ~3% implying that supersonic operation mode has only small advantage over transonic. On the other hand, for subsonic laser the maximum power is by 7% lower than in transonic, showing larger advantage of transonic over subsonic operation mode. The power achieved in supersonic and transonic K DPALs is higher than in subsonic by ~80% and ~20%, respectively, showing a considerable advantage of supersonic device over transonic and of transonic over subsonic.
我们研究了跨声速二极管泵浦碱金属激光器（DPAL）装置，将其作为一种比超声速装置更简单的替代方案，这是由B.D.巴尔马申科和S.罗森瓦克斯[《应用物理快报》102, 141108 (2013)]提出的，在超声速装置中，连续闭环运行需要复杂的硬件，包括超声速喷嘴、扩散器和高功率机械泵。本文报道了跨声速（马赫数M0.9）铯和钾DPAL的三维计算流体动力学建模，其中考虑了激光介质中的动力学过程。将这些激光器的性能与超声速（M2.5）和亚声速（M~0.2）DPAL的性能进行了比较。对于铯DPAL，在激光截面入口处具有相同的谐振器和铯密度时，跨声速装置可实现的最大功率仅比超声速装置低约3%，这意味着超声速运行模式相对于跨声速仅具有很小的优势。另一方面，对于亚声速激光器，最大功率比跨声速低7%，这表明跨声速运行模式比亚声速具有更大的优势。超声速和跨声速钾DPAL实现的功率分别比亚声速高约80%和20%，这表明超声速装置相对于跨声速具有相当大的优势，跨声速相对于亚声速也具有相当大的优势。
