Abstract
An external cavity diode laser is demonstrated using a Bragg grating written into a novel integrated optical fiber platform as the external cavity. The cavity is fabricated using flame-hydrolysis deposition to bond a photosensitive fiber to a silica-on-silicon wafer, and a grating written using direct UV-writing. The laser operates on a single mode at the acetylene P13 line (1532.83 nm) with 9 mW output power. The noise properties of the laser are characterized demonstrating low linewidth operation (< 14 kHz) and superior relative intensity noise characteristics when compared to a commercial tunable external cavity diode laser.
Highlights
Diffraction and Bragg gratings can be used in an external cavity diode laser (ECDL) to ensure single mode operation, reduced linewidths [1, 2] and excellent stability
Bragg-grating external cavities using glass materials have been to make single mode lasers; these have been made commercially available from Redfern Integrated Optics using a planar platform [10, 11] and Sacher-Laser using a volume holographic grating [12]; such lasers have demonstrated excellent linewidth, low relative intensity noise (RIN) and high side-mode suppression-ratio (SMSR)
We have demonstrated the suitability of UV-written Bragg gratings on a novel integrated optical fiber (IOF) platform as the external cavity
Summary
Diffraction and Bragg gratings can be used in an external cavity diode laser (ECDL) to ensure single mode operation, reduced linewidths [1, 2] and excellent stability. Bragg-grating external cavities using glass materials have been to make single mode lasers; these have been made commercially available from Redfern Integrated Optics using a planar platform [10, 11] and Sacher-Laser using a volume holographic grating [12]; such lasers have demonstrated excellent linewidth, low relative intensity noise (RIN) and high side-mode suppression-ratio (SMSR). Glass waveguides can be fabricated using direct UV-writing techniques that are capable of writing high quality apodized Bragg gratings [13, 14] These planar waveguides use a silicon substrate, with the advantage that this substrate acts to thermally equilibriate the structure. The platform has advantages from both fiber and planar technologies where fiber technology is highly developed, providing superior photosensitivity, lower losses and greater complexity and precision in the waveguide structure In this Paper we will present an integrated optical fiber (IOF) based ECDL.
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