Stefano Alessia, Zatti Luca, Liscidini Marco
Opt Lett. 2024 Sep 1;49(17):4819-4822. doi: 10.1364/OL.533455.
In this Letter, we theoretically study spontaneous parametric downconversion (SPDC) in a periodically poled structure composed of two linearly uncoupled resonators that are nonlinearly coupled via a Mach-Zehnder interferometer. The device does not require dispersion engineering to achieve efficient doubly resonant SPDC, and, unlike the case of a single resonator, one can reconfigure the system to generate photon pairs over a bandwidth of hundreds of nm. We consider the case of SPDC pumped at 775 nm in a periodically poled lithium niobate (PPLN) device compatible with up-to-date technological platforms. We calculated pair generation rates of up to 250 MHz/mW pump power for a single resonance and integrated pair generation rates of up to 100 THz/mW pump power over 170 nm. When properly reconfigured, a single device can efficiently generate over a bandwidth of some 300 nm, covering the S, C, L, and U infrared bands.
在本信函中，我们从理论上研究了由两个线性非耦合谐振器组成的周期性极化结构中的自发参量下转换（SPDC），这两个谐振器通过马赫 - 曾德尔干涉仪进行非线性耦合。该器件无需色散工程即可实现高效的双共振SPDC，并且与单个谐振器的情况不同，人们可以重新配置系统，以在数百纳米的带宽上产生光子对。我们考虑了在与最新技术平台兼容的周期性极化铌酸锂（PPLN）器件中以775 nm泵浦的SPDC情况。我们计算出单共振时高达250 MHz/mW泵浦功率的对生成率，以及在170 nm范围内高达100 THz/mW泵浦功率的积分对生成率。经过适当重新配置后，单个器件可在约300 nm的带宽上高效产生光子对，覆盖S、C、L和U红外波段。
