편광 빛살가르게를 이용한 자유공간 사냑 간섭계 Free space Sagnac interferometer using a polarizing beam splitter

판매 대리인 : 기율특허

전화번호 : 02-782-1004

메일주소 : kiyul@kiyul.co.kr

영문 원어  : The present invention relates to an improved structure of a Sagnac interferometer with improved measurement performance. The Sagnac interferometer comprises: a light source; a sensing unit that divides a light inputted from the light source into first and second beams vertically polarized from each other, moves the first and second beams along a closed path in opposite directions and then combines the first and second beams to output a combined beam; and a demodulation unit for having the first and second beams, outputted from the sensing unit, interfered together and measuring a phase change induced therebetween. The sensing unit includes: a polarizing beam splitter that divides a light inputted from the light source into vertically polarized first and second beams and outputs the beams to different output ports, respectively; a closed path unit that forms a closed path using two or more mirrors and switches the directions of the first and second beams, outputted from the polarizing beam splitter, to be moved along the closed path. The first beam is inputted to the output port for the second beam and the second beam is inputted to the output port for the first beam. The first and second beams outputted from the closed path unit are vertically polarized from each other, combined by the polarizing beam splitter and outputted to the same path to be provided to the demodulation unit. The Sagnac interferometer detects and provides a rotational angular velocity using a phase difference between the first beam and the second beam.