来自主动锁定超表面外腔激光器的幅度和频率调制梳
Amplitude- and frequency-modulated combs from an actively locked metasurface external-cavity laser
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中文总结 AI 辅助
研究将频率梳功能引入太赫兹超表面垂直外腔面发射激光器，结合高功率与可重构梳状输出，通过色散工程及射频偏置调制实现模态相位灵活控制，为太赫兹按需梳控及扩展到其他平台和波长范围提供策略。
中文摘要 AI 辅助
光学频率梳是光谱学、通信和超快光子学等多种光子学应用的关键组件。频率梳光子学的一个核心挑战是开发能够精确控制其工作状态并适应不同应用需求的光源。我们将频率梳功能引入太赫兹超表面垂直外腔面发射激光器（VECSEL），将其高输出功率和出色光束质量与可重构梳状输出相结合。该光源在主动锁模的3.5皮秒长脉冲和稳定的频率调制量子行走梳状状态之间表现出可逆切换。通过使用Gires-Tournois干涉仪（GTI）输出耦合器进行仔细的色散工程，并结合超表面的共振射频偏置调制，实现了对模态间相位关系的灵活控制。这些结果为太赫兹范围内的按需梳状控制铺平了道路，并提供了一种通用策略，可扩展到其他半导体频率梳平台和波长范围。
英文摘要
Optical frequency combs are key components of several photonics applications including spectroscopy, communications, and ultrafast photonics. A central challenge in frequency-comb photonics is to develop sources whose operating state can be precisely controlled and adapted to different application needs. We introduce frequency comb functionality to a THz metasurface vertical-external-cavity-surface-emitting laser (VECSEL), combining its characteristic high output power and excellent beam quality with a reconfigurable comb output. The source exhibits reversible switching between actively mode-locked 3.5 ps-long pulses and stable frequency-modulated quantum walk comb states. The flexible control of the intermodal phase relation is achieved through careful dispersion engineering via a Gires-Tournois interferometer (GTI) output-coupler combined with resonant RF bias modulation of the metasurface. These results pave the way for on-demand comb control in the THz range and provide a versatile strategy that could be extended to other semiconductor frequency-comb platforms and wavelength ranges.
