| 摘要 |
A handpiece for projecting laser radiation from a solid-state laser via an articulated arm to biological tissue being treated is disclosed. An optical system in the handpiece provides that the laser radiation is projected in a spot of selectively variable size at a fixed distance from the handpiece. The projected spot can be defined as an image of a characteristic invariant cross-section of the laser beam delivered to the handpiece which has about the same width at a wide range of M<2> values of the laser beam. This provides that at any mechanically selected size, the size of the projected spot remains substantially constant over the range of M<2> values between about 1 and 15. In one example the handpiece projects 2.94 mu m radiation in a range of spot sizes between about 0.5 mm and 1.5 mm. Spot size remains substantially constant over a range of M<2> values between about 1 and 15.
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