Patent ID: 9008134
Filing Date: 2015-04-14
Classification: G01J,G02B,H01S

Abstract:
1. A variable wavelength optical filter comprising: a first cylindrical lens receiving a beam, the first cylindrical lens having a central axis perpendicular to an incidence direction of the beam; a second cylindrical lens having a central axis perpendicular to the central axis of the first cylindrical lens, the second cylindrical lens receiving a beam outputted from the first cylindrical lens; a resonator resonating a beam outputted from the second cylindrical lens and outputting the resonated beam; a third cylindrical lens receiving the beam outputted from the resonator, the third cylindrical lens having a central axis parallel to the central axis of the second cylindrical lens; and a fourth cylindrical lens having a central axis perpendicular to the central axis of the third cylindrical lens, the fourth cylindrical lens receiving a beam outputted from the third cylindrical lens.