Patent ID: 7356222
Filing Date: 2008-04-08
Classification: G02B

Abstract:
1. A wavelength selective optical device comprising: a replaceable first graded index rod lens or another graded index rod lens having a different A an optical filter having a predetermined range of a pass bandwidth or a reflecting bandwidth arranged to face to the second end surface of the first graded index rod lens so that the parallel light beam emitted from the first graded index rod lens is incident on the optical filter; the replaceable first graded index rod lens being replaceably disposed contacting the optical filter wherein upon replacement by the another graded index rod lens an angle of the parallel light incident on the optical filter is adjusted by changing a refractive index distribution constant of the first graded index rod lens such that a wavelength range of the light which is reflected or transmitted by the optical filter is tuned within the predetermined range; and a tube through which the first rod lens can be pulled-out.