We present a near-infrared tunable vertical cavity surface emitting laser (VCSEL) based upon a unique electrothermally tunable microelectromechanical systems (MEMS) topside mirror designed for tissue imaging and sensing. At room temperature, the laser is tunable from 769-782nm with single mode CW output and a peak output power of 1.3mW. We show that the tunable VCSEL is suitable for use in frequency domain diffuse optical spectroscopy by measuring the optical properties of a tissue-simulating phantom over the tunable range. These results indicate that tunable VCSELs may be an attractive choice to enable high spectral resolution optical sensing in a wearable format.
Vincent J. Kitsmiller, Matthew Dummer, Klein Johnson, and Thomas D. O'Sullivan, "Tunable vertical cavity surface emitting lasers for use in the near infrared biological window
," Proc. SPIE 10488, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVIII, 104880L (Presented at SPIE BiOS: January 28, 2018; Published: 13 February 2018); https://doi.org/10.1117/12.2290899.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon