Patent ID: 9151961
Filing Date: 2015-10-06
Classification: G02B

Abstract:
1. An optical component which allows infrared laser beam to be transmitted therethrough to convert a polarization of the infrared laser beam, the component comprising: a first substrate body which is made of a platy member allowing infrared laser beam to be transmitted therethrough and having a refractive index of 2 to 4 with respect to the infrared laser beam, and which has an input surface where the infrared laser beam is incident and an inclined surface inclined at a predetermined angle of inclination to the input surface a second substrate body which is made of the platy member and which has an output surface from which the infrared laser beam is emitted and an inclined surface inclined at the predetermined angle of inclination to the output surface, and wherein the thickness d a transmitting phase retarding film which is formed on each of the first and second substrate bodies, and shifts a phase of the infrared laser beam; and an antireflection film which is formed on each of the input surface and the output surface, and prevents reflection of orthogonally incident infrared laser beam, wherein the angle of inclination is the same angle as an angle of refraction θ(λ) of the infrared laser beam in the substrate body which is calculated in accordance with Formula (1): (where λindicates a wavelength of the infrared laser beam, n(λ) indicates a refractive index of the platy member with respect to the infrared laser beam, and x indicates an angle of incidence of the infrared laser beam), and wherein an arrangement is made such that the transmitting phase retarding films formed on the inclined surfaces of the respective first and second substrate bodies are opposed to each other through a space, and the input surface and the output surface are parallel to each other.