A pair of external cavity diode lasers are fabricated using an integrated planar Bragg grating. The planar waveguide and Bragg reflector is UV-written within a glass-on-silicon chip. Intensity isolated, continuous wavelength tuning at > 1kHz modulation rate is acheived using micro-heating elements fabricated directly over the Bragg grating. Low RIN (<140dB) and low linewidth (δν ~ 200 kHz) operation is found using a heterodyne measurement. We demonstrate the lasers operating in phase-locked loop configuration where one laser is frequency-offset locked to the other.
Integrated optics is becoming increasingly important for applications in quantum information processing, quantum
sensing and for advanced measurement. Intrinsically stable and low-loss it provides essential routing and coupling for
quantum optical experiments offering functions such as interconnects, couplers, phase delays and routing. Silica-onsilicon
has particular attractions, and in this work the fabrication approaches and advantages of the technique will be
explored. In particular, UV direct writing of waveguides and Bragg gratings proves useful for its rapid-prototyping
capability and its ability to provide grating for characterization of components for loss, birefringence and coupling ratio.
This review concentrates on the fabrication of planar waveguide devices, and ways in which direct UV writing provides
important functionality. Examples of applications of silica-on-silicon waveguides include quantum enhanced
interferometry, teleportation, boson sampling as well as hybrid operation for single photon detection with transition edge
sensors directly placed onto waveguide devices.
Conventional singlemode semiconductor DFB and VCSEL lasers used in high resolution spectroscopy are often required to operate at specific, custom wavelengths, such as those associated with gas absorption lines. We present the results of work to develop alternative sources in the 1550nm and 1650nm regions, the latter coinciding with an absorption line of methane. Custom wavelength Bragg gratings have been used to stabilize the output of external cavity lasers implemented in both optical fiber and planar silica-on-silicon integrated circuits, using commercially available semiconductor gain chips, to give laser output at 1648 and 1649 nm, respectively. Thermal expansion or mechanical strain of the Bragg grating offers a suitable wavelength tuning mechanism. Results are presented including the wavelength tuning range, output power, relative intensity noise (RIN), side-mode suppression and linewidth of devices for application in high resolution gas spectroscopy. The different methods of writing Bragg gratings in optical fiber and planar silica-on-silicon allow a high degree of flexibility in the choice of emission wavelength.
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