Tung J C, Ke H T, Liang H C, Huang K F, Chen Y F
Opt Lett. 2022 Aug 1;47(15):3756-3759. doi: 10.1364/OL.464399.
Based on the birefringent effect of the gain medium, a diode-pumped Nd-doped vanadate laser with nearly hemispherical cavity is exploited to emulate the quantum Green functions of two-dimensional commensurate harmonic oscillators. By matching the theoretical calculations to the far-field patterns of lasing modes, the resonant transverse frequencies can be accurately determined up to extremely high orders. The Shannon entropy is further employed to calculate the spatial entanglement of the quantum Green function as a function the transverse frequency. From the resonant transverse frequencies, all lasing modes are confirmed to be in excellent agreement with the maximum entropy states. This discovery implies that the formation of lasing modes is relevant to the coupling interaction between the pump source and the laser cavity.
基于增益介质的双折射效应，利用具有近半球形腔的二极管泵浦掺钕钒酸盐激光器来模拟二维 commensurate 谐振子的量子格林函数。通过将理论计算与激光模式的远场图案相匹配，可以精确确定高达极高阶的共振横向频率。进一步利用香农熵来计算作为横向频率函数的量子格林函数的空间纠缠。从共振横向频率来看，所有激光模式都被证实与最大熵态高度吻合。这一发现意味着激光模式的形成与泵浦源和激光腔之间的耦合相互作用有关。
