论文标题
从590 nm到1150 nm的高效基于芯片的光学参数振荡器
Efficient chip-based optical parametric oscillators from 590 nm to 1150 nm
论文作者
论文摘要
光学参数振荡器被广泛用于以常规激光增益无法访问的频率生成相干光。然而，在可见光谱中运行的基于芯片的参数振荡器通常遭受泵至信号转换效率的影响，通常小于0.1％。在这里，我们基于氮化硅光子学，证明了有效的光学参数振荡器，该光子学解决了260 THz（1150 nm）和510 THz（590 nm）之间的频率。在385 THz（780 nm）附近的氮化硅微孔泵送硅微孔可产生单色信号和空闲波，并在此波长范围内具有前所未有的输出功率。我们在1 MW和5 MW之间估计片上输出功率（分别用于信号和惰轮），转化效率达到约15％。这种改善的性能是我们开发用于宽带近临界耦合的滑轮波导，这利用了波导谐振器耦合速率和转换效率之间的基本联系。最后，我们发现模式竞争降低了高泵功率的转换效率，从而限制了最大可实现的输出功率。我们的工作证明，使用集成光子学构建的光学参数振荡器可以以高效率产生有用的可见激光。
Optical parametric oscillators are widely used to generate coherent light at frequencies not accessible by conventional laser gain. However, chip-based parametric oscillators operating in the visible spectrum have suffered from pump-to-signal conversion efficiencies typically less than 0.1 %. Here, we demonstrate efficient optical parametric oscillators based on silicon nitride photonics that address frequencies between 260 THz (1150 nm) and 510 THz (590 nm). Pumping silicon nitride microrings near 385 THz (780 nm) yields monochromatic signal and idler waves with unprecedented output powers in this wavelength range. We estimate on-chip output powers (separately for the signal and idler) between 1 mW and 5 mW and conversion efficiencies reaching approximately 15 %. Underlying this improved performance is our development of pulley waveguides for broadband near-critical coupling, which exploits a fundamental connection between the waveguide-resonator coupling rate and conversion efficiency. Finally, we find that mode competition reduces conversion efficiency at high pump powers, thereby constraining the maximum realizable output power. Our work proves that optical parametric oscillators built with integrated photonics can produce useful amounts of visible laser light with high efficiency.
