摘要:
A method and apparatus for processing a material creates a cavitation nucleus in a portion of the material by focusing optical radiation at the portion of the material and then causing mechanical disruption in another portion of the material adjacent the cavitation nucleus by subjecting the cavitation nucleus to ultrasound waves.
摘要:
In one aspect the invention provides a method for laser induced breakdown of a material with a pulsed laser beam where the material is characterized by a relationship of fluence breakdown threshold (F.sub.th) versus laser beam pulse width (T) that exhibits an abrupt, rapid, and distinct change or at least a clearly detectable and distinct change in slope at a predetermined laser pulse width value. The method comprises generating a beam of laser pulses in which each pulse has a pulse width equal to or less than the predetermined laser pulse width value. The beam is focused to a point at or beneath the surface of a material where laser induced breakdown is desired.The beam may be used in combination with a mask in the beam path. The beam or mask may be moved in the x, y, and Z directions to produce desired features. The technique can produce features smaller than the spot size and Rayleigh range due to enhanced damage threshold accuracy in the short pulse regime.
摘要:
A patient interface device adapted to provide an interface between a cornea and a surgical laser system. A frame has an applanation end and an attachment end which is adapted to couple to the surgical laser system. A skirt is affixed to the applanation end of the frame and is adapted to seal against the anterior surface of the cornea to form a chamber. A lens is disposed near the applanation end of the frame and is supported by a flexible support which affixes the lens to the frame.
摘要:
Methods and systems for controlling a subject's access to an activity based on a sleep quality index are described. The sleep quality index may related to various physiological data relating to the subject, including current and historical physiological data, previous sleep quality indices for the subject. The subject's access to the activity may also be restricted based on personal characteristics of the subjects or on the identity of the subject.
摘要:
A patient interface device adapted to provide an interface between a cornea and a surgical laser system. A frame has an applanation end and an attachment end which is adapted to couple to the surgical laser system. A skirt is affixed to the applanation end of the frame and is adapted to seal against the anterior surface of the cornea to form a chamber. A lens is disposed near the applanation end of the frame and is supported by a flexible support which affixes the lens to the frame.
摘要:
In one aspect the invention provides a method for laser induced breakdown of a material with a pulsed laser beam where the material is characterized by a relationship of fluence breakdown threshold (Fth) versus laser beam pulse width (T) that exhibits an abrupt, rapid, and distinct change or at least a clearly detectable and distinct change in slope at a predetermined laser pulse width value. The method comprises generating a beam of laser pulses in which each pulse has a pulse width equal to or less than the predetermined laser pulse width value. The beam is focused to a point at or beneath the surface of a material where laser induced breakdown is desired. The beam may be used in combination with a mask in the beam path. The beam or mask may be moved in the x, y, and Z directions to produce desired features. The technique can produce features smaller than the spot size and Rayleigh range due to enhanced damage threshold accuracy in the short pulse regime.