Nonlinear multi-frequency phonon lasers with active levitated optomechanics
Nonlinear multi-frequency phonon lasers with active levitated optomechanics
复制标题
DOI：
10.1038/s41567-022-01857-9
复制
发表时间：
2022-10
期刊：
影响因子：
19.6
通讯作者：
Tengfang Kuang;Ran Huang;W. Xiong;Y. Zuo;Xiang Han;F. Nori;C. Qiu;Hui Luo;H. Jing;Guangzong Xiao
中科院分区：
文献类型：
--
作者：
Tengfang Kuang;Ran Huang;W. Xiong;Y. Zuo;Xiang Han;F. Nori;C. Qiu;Hui Luo;H. Jing;Guangzong Xiao
声子激光器利用声子的相干放大，是探索非线性声子学、成像纳米材料结构和操作声子器件的一种手段。最近，通过在光镊中悬浮纳米球来演示由色散光机械耦合控制的声子激光器。这种悬浮光机械装置在高真空中噪音极小，可以灵活控制大质量物体，而无需任何内部离散能级。然而，利用悬浮的微米级物体实现声子激光发射具有挑战性，因为光学散射损失比纳米级大得多。在这里，我们报告了一种具有微米尺寸球体的非线性多频声子激光器，该激光器由耗散耦合控制。 Yb3+ 掺杂系统提供的有源增益起着关键作用。与无源器件相比，它的基模声子激光振幅提高了三个数量级。此外，非线性机械谐波可以自发地出现在激光阈值之上。此外，我们观察到基模及其谐波的声子的相干相关性。我们的工作将悬浮光力学领域推向了一个新的领域，使设计典型微型物体的集体运动特性变得可行。
Phonon lasers, which exploit coherent amplifications of phonons, are a means to explore nonlinear phononics, image nanomaterial structures and operate phononic devices. Recently, a phonon laser governed by dispersive optomechanical coupling has been demonstrated by levitating a nanosphere in an optical tweezer. Such levitated optomechanical devices, with minimal noise in high vacuum, can allow flexible control of large-mass objects without any internal discrete energy levels. However, it is challenging to achieve phonon lasing with levitated microscale objects because optical scattering losses are much larger than at the nanoscale. Here we report a nonlinear multi-frequency phonon laser with a micro-size sphere, which is governed by dissipative coupling. The active gain provided by a Yb3+-doped system plays a key role. It achieves three orders of magnitude for the amplitude of the fundamental-mode phonon lasing, compared with the passive device. In addition, nonlinear mechanical harmonics can emerge spontaneously above the lasing threshold. Furthermore, we observe coherent correlations of phonons for both the fundamental mode and its harmonics. Our work drives the field of levitated optomechanics into a regime where it becomes feasible to engineer collective motional properties of typical micro-size objects.