用于电信到铷光谱的可重入无芯片空间光子接口
A re-entrant chip-free-space photonic interface for telecom-to-Rubidium spectroscopy
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中文总结 AI 辅助
研究针对光子集成电路与外部介质交互难题，提出可重入无芯片空间光子接口，通过薄膜铌酸锂电路实现电信光倍频等操作，经发射 - 相互作用 - 收集回路解析光谱并稳定激光器，为嵌入外部介质到PICs开辟道路。
中文摘要 AI 辅助
光子集成电路（PICs）能在单个芯片上高效、可扩展且功能密集地产生、路由和处理光。然而，芯片上紧密受限的模式不易与原子蒸气、流体、增益介质和生物样本进行有效交互。现有方法需将介质置于芯片上或弱的、紧密受限的倏逝场中，限制了相互作用体积和可及介质范围。本文展示了一种可重入无芯片空间接口，其中薄膜铌酸锂电路将电信光倍频，通过铷蒸气室发射780纳米场，并在同一芯片上收集反射探针。这种发射 - 相互作用 - 收集回路解析了饱和吸收光谱，并在2小时内将电信激光器稳定在±280千赫兹以内。我们的研究为通过可重入光子接口将外部介质嵌入PICs铺平了道路。
英文摘要
Photonic integrated circuits (PICs) generate, route, and process light with high efficiency, scalability, and functional density on a single chip. Yet the tightly confined on-chip modes can not easily access or effectively interact with atomic vapors, fluids, gain media, and biological samples. Existing approaches require bringing the medium onto the chip or into a weak, tightly confined evanescent field, which restricts the interaction volume and the range of accessible media. Here, we demonstrate a re-entrant chip-free-space interface in which a thin-film lithium niobate circuit frequency-doubles telecom light, emits the 780~nm field through a Rubidium vapor cell, and recollects the reflected probe on the same chip. This emit-interact-recollect loop resolves the saturated absorption spectrum and stabilizes the telecom laser to within $\pm 280$~kHz over 2 hours. Our study paves an route to embed external media into PICs through the re-entrant photonic interface.
