Abstract
Optical microcavities have been widely used in nonlinear optics, quantum optics, and laser technologies. Here we demonstrate the self-injection locking of a distributed feedback diode laser using home-made high-finesse Fabry-Perot microcavity. The Fabry-Perot microcavity is fabricated from an x-cut lithium niobate crystal with highly reflective coatings. Frequency pulling effect can be observed for a successful locking, and results in a single-longitudinal mode lasing with narrow linewidth. The lasing wavelength and output power are found robust to the laser-diode current and temperature variations, in comparison to the free-running case. We further characterize the laser linewidth with beat note measurement with a high-performance external cavity diode laser, with beat-note linewidth of 601.85 kHz. This results shows a new method for laser frequency stabilization in a simple setup, and may find applications in telecommunication and spectroscopy.
Highlights
Optical microcavities are important for optical integration in practical applications [1,2,3,4,5,6,7,8,9]
Fabry-Perot microcavities (FPMC) are relatively simple to fabricate with high finesse [10,11,12], which is important for nonlinear optics applications, e.g., second-harmonic generation [12,13,14,15,16], parametric amplification [17,18,19], frequency-comb generation [20], and entangled photon generation [21]
We fabricate a FPMC, with high-finesse of up to 55.5. This FPMC is used for the self-injection locking of a semiconductor distributed feedback (DFB) laser
Summary
Optical microcavities are important for optical integration in practical applications [1,2,3,4,5,6,7,8,9]. Fabry-Perot microcavities (FPMC) are relatively simple to fabricate with high finesse [10,11,12], which is important for nonlinear optics applications, e.g., second-harmonic generation [12,13,14,15,16], parametric amplification [17,18,19], frequency-comb generation [20], and entangled photon generation [21]. The above applications require narrow linewidth and high wavelength stability, which can be challenging for normal diode lasers. We fabricate a FPMC, with high-finesse of up to 55.5 This FPMC is used for the self-injection locking of a semiconductor distributed feedback (DFB) laser. A 402 kHz beat-note linewidth can be observed, showing a good and stable locking
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