The development of an ultra-compact, short-wave infrared spectrophotometer small enough to fit in a wrist-based wearable device produces the capability for non-invasive and real-time measurement of various physiologic biochemistries that cannot be interrogated with the same accuracy when using light emitting diodes (LEDs) and common photoplethysmography (PPG) applications. By producing many discrete and individually-generated light sources from tens of laser diodes on a single, silicon-based photonics integrated circuit (PIC), this new platform enables us to determine a user’s body temperature, hydration status, and concentrations of solutes within the dermal interstitial fluid, potentially useful in monitoring health in a novel way.
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