To compare the penetration effect of both 1064 nm solar laser and concentrated solar radiations on biological tissue, ex vivo experiments were performed on chicken breast samples with similar incident doses. A 1064 nm Nd:YAG solar laser and a simple solar concentrator were first developed, both capable of emitting 10 W light power. Two square cross-section hollow light beam homogenizers were then designed and built, one emitting uniform monochromatic 1064 nm laser radiation and the other emitting uniform full-spectrum solar radiation, all within 24° divergence angle with about 5 W continuous-wave light power uniformly distributed in 0.36 cm 2 homogenizer output area. For the same incident irradiance distribution and exposure time, and thus for similar incident dose, different light-tissue interaction effects were found. The 1064 nm solar laser radiation was less absorbed by the samples as compared to the solar radiation, resulting in a deeper 1064 nm laser radiation penetration in the tissue, revealing that wavelength was a crucial factor for light-tissue interaction research.
- ex vivo experiment
- solar laser, beam homogenizer
- solar surgery