论文标题
激光冷却协助照明邮件的热管理
Laser cooling assisted thermal management of lightsails
论文作者
论文摘要
通过具有GW/M $^2 $的强度的激光器的辐射压力，可以将Lightsail加速到超高速度，尽管这在光扣的热管理中带来了关键的挑战。在这封信中，我们探索了以前探索的辐射冷却方法的散热热量，以散发热量。我们首先检查激光冷却的冷却能力，并表明用ytterbium离子掺杂的微米厚层的冷却速率可以超过黑体热发射的冷却速率。这允许在物质损伤时更强烈的激光照明，因此缩短了加速度距离。接下来，我们探讨了有限的激光冷却操作带宽以解释泵送激光器的多普勒变化，并得出结论，激光冷却对目标速度$ \ lyssim5 \％$用于室温操作有用。
A lightsail can be accelerated to ultra-high speed by the radiation pressure of a laser having an intensity of the order of GW/m$^2$, which though presents a critical challenge in the thermal management of lightsails. In this letter, we explore the applicable regimes of solid-state laser cooling in dissipating heat in additional to the previously explored radiative cooling approach. We begin by examining the cooling capacity of laser cooling, and show that the cooling rate from a micron-thick layer doped with ytterbium ions can exceed that of blackbody thermal emission. This allows more intense laser illumination upon material damage, and consequently shortened acceleration distance. Next, we explore the impact of the limited operating bandwidth of laser cooling to account for the Doppler shift of the pumping laser, and conclude that laser cooling is helpful for target velocities $\lesssim5\%$ for room-temperature operations.
