| 摘要 |
A fractional treatment system can be configured with a laser wavelength t hat is selected such that absorption of the laser wavelength within the tiss ue increases as the tissue is heated by the laser (e.g., 1390-1425 nm). Desi rably, the laser wavelength is primarily absorbed within a treated region of skin by water and has a thermally adjusted absorption coefficient within th e range of about 8 cm"1 to about 30 cm 1. An adjustable mechanism can be use d to adjust the beam shape, beam numerical aperture, beam focus depth, and/o r beam size to affect the treatment depth and or the character of the result ing lesions. The system may be desiged to be switchable between a treatment mode that is semi-ablative and a treatment mode that is not semi-ablative. A djustment of these parameters can improve the efficiency and efficacy of tre atment. Illustrative examples of adjustable mechanisms include a set of spac ers of different lengths, a rotatable turret with lens elements of different focal distances, an optical zoom lens, and a mechanical adjustment apparatu s for adjusting the spacing between two optical lens elements.
|
