Solid state laser gyro with interferometrically substracted noise

摘要: A ring laser apparatus for spontaneous-emission-free detection including several mirrors. Some of the mirrors a first, second and third mirror are arranged to form ring. gain medium is located between two within Radiation from an external radiation source impinges on fourth reflected illuminate medium. The thereby produces first oppositely traveling beams along pathways, each pathways having equal path lengths. provide output through one into beam splitter after respectively striking fifth sixth comprises layer thickness which much smaller than wavelength so that directed highly coherent splitter. operates as signal free spontaneous emission noise detector.