Optical sensor and method for producing the same

A method for producing an optical sensor comprising a plurality of optical elements including one of a Faraday element and a Pockels element, whereby light is transmitted through the optical elements to optically measure one of an applied voltage, an electric field and a magnetic field acting upon said one of a Faraday element and a Pockels element, comprising steps of:

• bonding the optical elements onto a first base plate for adjusting optical axes of the optical elements, the optical elements being in close contact with a first synthetic resin interposed between adjacent optical elements;
• filling a second synthetic resin around the optical elements, said second synthetic resin being of the same material as said first synthetic resin;
• solidifying the filled second synthetic resin, said optical elements, said base plate and said second resin forming an intermediate structure;
• turning the intermediate structure upside down and arranging the intermediate structure on a second base plate having a flat bottom surface;
• filling a third synthetic resin of the same material as the first synthetic resin around the optical elements and the first base plate;
• solidifying the third synthetic resin;
• and
• removing the optical elements together with the first base plate and the second and third synthetic resins form the second base plate.

An optical sensor, comprising:

• a plurality of optical elements comprising one of a Pockels element and a Faraday element;
• input means for transmitting light to said optical elements;
• output means for transmitting light from said optical elements, whereby light passing through said optical elements is modulated to optically measure one of an applied voltage, an electric field and a magnetic field acting on said one of a Pockels element and a Faraday element;
• a first synthetic resin interposed between adjacent optical elements such that said optical elements are in close contact with said first synthetic resin such that gaps present between adjacent optical elements are completely filled by said first synthetic resin;
• and
• a second synthetic resin surrounding said optical elements, said second synthetic resin being made of the same material as said first synthetic resin.