Miniature narrow-linewidth 1 μm Laser
Applied Physics Letters(2024)
Abstract
Self-injection locking scheme has the potential to narrow the linewidth of
lasers in a compact setup. Here, we report a narrow linewidth laser source near
1 μm by self-injection locking scheme using a Fabry-Perot (FP) hollow
resonator with a high-quality factor (Q>10^8). The measured fundamental
linewidth of the laser is 41 Hz, and a coarse tuning range over 5.5 nm is
achieved by changing the driving current of the laser source. Meanwhile, a
fine-tuning range of 373 MHz is achieved without mode hops by changing the
voltage applied to the PZT on the resonator. More importantly, benefiting from
the low thermal refractive noise and low thermal expansion of the FP hollow
resonator, the beat-note linewidth and the frequency Allan deviation are
measured to be 510.3 Hz in and 10^-11 (1s averaging time), respectively, by
using a fully stabilized frequency comb as reference. Such a high-performance
laser is fully integrated with a palm-sized package (52.3 mL) for
field-deployable applications.
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