We are developing prototype chip-scale low-power integrated-optic gas-phase chemical sensors based on infrared
Tunable Diode Laser Absorption Spectroscopy (TDLAS). TDLAS is able to sense many gas phase chemicals with high
sensitivity and selectivity. Using semiconductor fabrication and assembly techniques, the low-cost integrated optic
TDLAS technology will permit mass production of sensors that have wide ranging industrial, medical, environmental,
and consumer applications. Novel gas sensing elements using low-loss resonant photonic crystal cavities or waveguides
will permit monolithic integration of a laser source, sampling elements, and detector on a semiconductor materials
system substrate. Practical challenges to fabricating these devices include: a) selecting and designing the high-Q micro-resonator
sensing element appropriate for the selected analyte; and b) device thermal management, especially stabilizing
laser temperature with the precision needed for sensitive spectroscopic detection. In this paper, we analyze the expected
sensitivity of micro-resonator-based structures for chemical sensing, and demonstrate a novel approach for exploiting
laser waste heat to stabilize the laser temperature.
Qubits based on trapped ions are being investigated as a promising platform for scalable quantum information
processing. One challenge associated with the scalability of such a multi-qubit trapped ion system is the need for an
ultraviolet (UV) laser beam switching and control system to independently modulate and address large qubit arrays. In
this work, we propose and experimentally demonstrate a novel architecture for a laser beam control system for trapped
ion quantum computing based on fast electro-optic amplitude switching and high-fidelity electromechanical beam
shuttering using a microelectromechanical systems (MEMS) deflector coupled into a single-mode optical fiber. We
achieve a rise/fall time of 5 ns, power extinction of -31 dB, and pulse width repeatability of > 99.95% using an electrooptic
switch based on a β-BaB2O4 (BBO) Pockels cell. A tilting MEMS mirror fabricated using a commercial foundry
was used to steer UV light into a single-mode optical fiber, resulting in an electromechanical beam shutter that
demonstrated a power extinction of -52 dB and a switching time of 2 μs. The combination of these two technologies
allows for high-fidelity power extinction using a platform that does not suffer from temperature-induced beam steering
due to changes in modulation duty cycle. The overall system is capable of UV laser beam switching to create the
resolved sideband Raman cooling pulses, algorithm pulses, and read-out pulses required for quantum computing
applications.
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