Patent ID: 7095497
Filing Date: 2006-08-22
Classification: G02B,G03F

Abstract:
1. A beam splitting apparatus comprising: a first transparent plate having a wedge, said first transparent plate inclining to an incident light, and splitting the incident light into a transmitted light and a reflected light, the reflected light including a light reflected on a front surface of said first transparent plate and a light reflected on a back surface of said first transparent plate; a second transparent plate inclining to the reflected light from said first transparent plate, said second transparent plate transmitting, toward a first detector, one part of the reflected light from said first transparent plate, and reflecting remaining part of the reflected light from said first transparent plate; and a third transparent plate having a wedge, said third transparent plate inclining to the transmitted light from said first transparent plate, said third transparent plate reflecting, toward a second detector, one part of the transmitted light from said first transparent plate that has the same polarization state as a transmitted light from said second transparent plate, and transmitting remaining part of the transmitted light from said first transparent plate, a reflected light from said third transparent plate including a light reflected on a front surface of said third transparent plate and a light reflected on a back surface of said third transparent plate, wherein the wedge of said first transparent plate is formed to generate several interference fringes on the first detector when the light reflected on the front surface of said first transparent plate interferes with the light reflected on the back surface of said first transparent plate, and wherein the wedge of said third transparent plate is formed to generate several interference fringed on the second detector when the light reflected on the front surface of said third transparent plate interferes with the light reflected on the back surface of said third transparent plate.