Closely way it possesses the contrast wave length quality where contrast closely in the infrared it deviates

摘要

PURPOSE: To provide an image fiber having diameter extremely fine, capable of transmitting a near infrared image with excellent contrast and capable of obtaining biological function image information by applying the image fiber an extremely fine diameter endoscope. ;CONSTITUTION: This quartz-based image fiber is produced by controlling the number of cores to 6000 and diameter to 500μm by using silicon dioxide to which germanium dioxide is added as a core part to control the difference of refractive index to +3%, using silicon dioxide to which fluorine is added as a clad part to control the difference of refractive index to -1% and defining N.A as about 0.4, core diameter as about 2.0μm and core/clad-diameter ratio as about 1.5 respectively so that the wavelength of cutoff wave is 0.7μm, thereby obtaining high contrast property in 0.9μm wavelength showed by (a).;COPYRIGHT: (C)1996,JPO