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The collagen is the functional form of a biological oligomer whose monomers are chiral amino acids. Tissues filled up of collagen are anisotropic optically structures, biréfringent and nonlinear. The purpose of this study was characterizing nonirradiated and polarized He-Ne laser irradiated type I collagen using polarized light microscopy to investigate the birefringence and the second harmonic generation (SHG) to analyze the nonlinear susceptibility. Twelve Wistar rats were alienated into four groups according to the ages: 34, 48, 62 and 76 days. The groups received, respectively, 1; 5; 9; and 13 irradiations of D= IJ/cm^ during 46s on Achilles tendon, which was chosen randomly as right or left. Thereafter, the animals were sacrificed and the tendons were extracted to prepare the specimens. For polarized light microscopy, eight-|im sections were obtained to evaluate the form and intrinsic birefringences. For SHG, it was used a Ti:Safira (150fs) laser at a repetition rate of 76MHz, beam diameter of ^= 40p,m, wavelength of A,= 800nm and AA-= lOnm and Pp== llOmW. The beam passed through a linear polarizer and two microscope objectives were used to focalize and collect the incident and emergent radiation, respectively. A second linear polarizer was placed after of collecting objective. An infrared absorber and blue transmitter filter was used a sure that only A,= 400nm was measured. The ratio, p, between two hyperpolarizability tensors was studied. The irradiated samples presented higher birefringence (An) and nonlinear susceptibility (p) when compared to nonin-adiated samples. These results indicate that a polarized He-Ne laser aligns the collagen fibrils to the long tendon axis.

Caracterização e modelagem dos fenômenos anisotrópicos do colágeno após irradiação com Laser polarizado de emissão vermelha