Aiming at studying solar photocoagulation in biological tissue with both low energy and high energy portions of solar
spectrum, a simple color separation technique is proposed. The chromatic aberration characteristic of Fresnel lens is
exploited to achieve color separation by a plane mirror with a large central elliptical hole, reflecting the solar radiation
above 600nm to one fused silica light guide, while allowing the passage of the remaining radiation to another guide.
ZEMAX™ ray-tracing code is used to optimize the performance of each optical component. To attain a stable solar
coagulation, the prototype is tested on a two-axis solar tracker. The ex vivo measurement is performed on chicken
breasts at the solar power level of 30W and the exposure time of 60 seconds, attaining a uniform coagulation over a large
area of 15mm x 15mm. A strong dependence of the penetration depth on wavelength is observed. Our cost effective solar
photocoagulation prototype produces the same type and extent of tissue coagulation ordinarily achieved with surgical
laser equipment.
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