Patent ID: 9375136
Filing Date: 2016-06-28
CPC Classification: A61B,G02B

Claim Text:
1. An optical system, comprising: a multi-photon endoscope configured to enable multiphoton excitation fluorescence imaging having a distal end; and a refractive optical lens configured to enable multiphoton excitation fluorescence imaging transmittance disposed in the distal end that can transmit visible light and multiphoton image-excitation light, wherein the lens further comprises: a focusing lens element consisting of a body of lens material having an anterior surface and a posterior surface, that transmits light in an optical path there through, and an optical axis, wherein one of the anterior surface and the posterior surface has a single curvature and the other of the anterior surface and the posterior surface has at least two optical zones each having a different curvature, further wherein the one of the at least two optical zones of the lens has a focus location along the optical axis; and the other one of the at least two optical zones of the lens has a different focus location along the optical axis.