Pump-locked microcavity Brillouin laser
arxiv(2024)
摘要
Microcavity-based microlasers are the kernel light sources for integrating
photonics and optoelectronics. The traditional pump light frequency locking
mainly utilizes a complex system with optoelectronic feedback, which requires a
high-cost narrow-linewidth pump laser and limits the application of microlasers
in integrated optoelectronic systems. We propose to utilize Rayleigh scattering
of microcavities to lock the frequency of the pump laser to the resonant
frequency of the laser microcavity with an all-optical method. While
compressing the linewidth of the pump laser, it can greatly improve the
long-term stability of the optically pumped microcavity laser. In the
experiment, the linewidth of the semiconductor pump laser is compressed from
the MHz level to the kHz level. The microcavity Brillouin laser achieves an
ultra-narrow intrinsic linewidth of 100 Hz, with an ultra-low frequency noise
of 35 Hz2/Hz. The constructed microlaser obtains a locking time up to 1 hour,
which does not require any temperature control or vibration isolation of the
laser system. This work is the first demonstration to achieve an optically
pump-locked microcavity Brillouin laser, which provides a stable and reliable
low-cost experimental platform for ultra-narrow linewidth lasers, precision
laser sensors, microwave-photonic signal synthesizer, and optomechanical
systems.
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