18 February 2014 VCSELs in the visible to IR as a light source for low light therapy
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Proceedings Volume 8932, Mechanisms for Low-Light Therapy IX; 893206 (2014) https://doi.org/10.1117/12.2040863
Event: SPIE BiOS, 2014, San Francisco, California, United States
Abstract
VCSELs (Vertical Cavity Surface Emitting Lasers ) provide a very versatile optical source for Low Light Therapy applications. This talk will discuss performance characteristics and packaging demonstrations for VCSELs primarily operating in the 680nm and 850nm regimes. At 680nm individual VCSELs produce >10mW, while >0.35W can be provided from a 0.4mm2 emission area. Spectral width is typically 1-2nm even for a multi-mode or array device. At 850nm these numbers increase to >30mW and >0.8W. Even higher powers can be achieved under pulsed modulation, i.e. 0.55W for a 680nm VCSEL or 1.2W for an 850nm VCSEL. While we report on results achieved at 680nm and 850nm, extension to wavelengths ranging from 660nm to 1000nm is easily achieved. The packaging flexibility of VCSELs also makes them of significant interest to the Low Light Therapy community. We will report on the incorporation of VCSELs into surface mount packages, including typical LED packages such as the PLCC, or ceramic chip carriers. VCSELs in PLCC packages have been attached to flexible circuits to provide a broad area illumination. We will also report on a unique chip on board package which easily allows for the addition of optical elements such as diffusers, diffraction gratings or lenses. This package is 2mm on a side, sufficiently small for incorporation into catheters or implantation.
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Klein Johnson, Matthew Dummer, William Hogan, Charles Steidl, Mary Hibbs-Brenner, "VCSELs in the visible to IR as a light source for low light therapy", Proc. SPIE 8932, Mechanisms for Low-Light Therapy IX, 893206 (18 February 2014); doi: 10.1117/12.2040863; https://doi.org/10.1117/12.2040863
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