Apparatus and method for laser treatment of a biological...

Details Apparatus and method for laser treatment of a biological... Apparatus and method for laser treatment of a biological...

2007-03-02

2011-12-27

Farah, Ahmed (Department: 3769)

Surgery

Instruments

Light application

C606S004000, C606S010000, C607S088000, C607S089000

Reexamination Certificate

active

08083731

ABSTRACT:
An apparatus for laser processing of a material, in particular the eye cornea, emits on to the material a train (18′) of laser radiation pulses having a pulse duration in the femtosecond range. The pulse train comprises a multiplicity of successive pulse groups, each pulse group comprising at least two laser radiation pulses (20′, 22′). The pulses of a pulse group are directed at substantially the same processing site of the material, but the pulses of successive groups are directed at substantially different processing sites of the material. According to the invention the time interval between successive laser radiation pulses of a pulse group is in the nanosecond range. In particular, the intensity or energy of the pulses within a pulse group is graduated, in such a way that a preceding prepulse (20′) has substantially lower intensity or energy than a following main pulse (22′).

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Tibor, Juhasz, et al., “Corneal Refractive Surgery with Femtosecond Lasers,” IEEE Journal of Selected Topics in Quantum Electronics, vol. 5, No. 4, pp. 902-910 (Jul./Aug. 1999).
Arnold, C.L., et al., “Streak Formation as Side Effect of Optical Breakdown During Processing the Bulk of Transparent Kerr Media with Ultra-Short Laser Pulses,” Appl. Phys. B, vol. 80, pp. 247-253 (2005).

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