| 摘要 |
In a fractional treatment system, an adjustable mechanism can be used to adjust the beam shape, beam numerical aperture, beam focus depth, and/or bea m size to affect the treatment depth and or the character of the resulting l esions. Adjustment of these parameters can improve the efficiency and effica cy of treatment. Illustrative examples of adjustable mechanisms include a se t of spacers of different lengths, a rotatable turret with lens elements of different focal distances, an optical zoom lens, and a mechanical adjustment apparatus for adjusting the spacing between two optical lens elements. In o ne aspect, the fractional treatment is configured with a laser wavelength th at is selected such that absorption of the laser wavelength within the tissu e decreases as the tissue is heated by the laser (e.g., 1480- 1640 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 7 cm-1 to about 26 cm-1.
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