双光子laser的偏振不稳定性
Polarization instabilities in a two-photon laser
摘要：
描述了一种基于双光子受激发射过程的新型量子振荡器的工作特性。该双光子激光器由置于高精细横模简并光学谐振器中的自旋偏振和激光驱动的$^{39}$ K原子组成，并在770 nm波长处产生功率为$\sim $ 0.2 $μ$ W的光束。我们观察到双光子激光偏振态的复杂动力学不稳定性，这是由原子的塞曼简并性所造成的。我们推测，如果这种简并被解除，激光器可以发射偏振纠缠的孪生光束。
英文摘要：
We describe the operating characteristics of a new type of quantum oscillator that is based on a two-photon stimulated emission process. This two-photon laser consists of spin-polarized and laser-driven $^{39}$K atoms placed in a high-finesse transverse-mode-degenerate optical resonator, and produces a beam with a power of $\sim $0.2 $μ$W at a wavelength of 770 nm. We observe complex dynamical instabilities of the state of polarization of the two-photon laser, which are made possible by the atomic Zeeman degeneracy. We conjecture that the laser could emit polarization-entangled twin beams if this degeneracy is lifted.
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