Patent ID: 7082151
Filing Date: 2006-07-25
Classification: A61F

Abstract:
1. A laser device, comprising a laser beam emitter having an optical resonator and an optical fiber for guiding a laser beam from said laser beam emitter, wherein said optical resonator has a resonator and a reflection mirror, wherein numerical apertures NAi, NAe and Naf have a relation of: NAi<NAe<NAf, where the numerical aperture of the laser beam entering said optical fiber is NAi, the numerical aperture of the laser beam emitted from said optical fiber is NAe, the numerical aperture of said optical fiber is NAf, and at least one of a length of said resonator or a curvature of said reflection mirror is determined so as to satisfy the condition that a parameter M 2 of beam quality of a projected laser beam is within a range of 8≦M 2 ≦22, where M 2 =πW·/θ (W is a beam waist of a laser beam; θ is a spreading angle; and λ is a wavelength of the laser beam).