Apparatus for fixing solid immersion lens

An apparatus for fixing a solid immersion lens (SIL) in an SIL optical system, comprising:

• a first adapter equipped with the SIL, adjusting a distance from an infrared ray (IR) objective lens and a focal length from a specimen by adjusting the location of the SIL, and in closely horizontal contact with the specimen;
• a second adapter screw-coupled to an inner surface of the first adapter and screw-coupled to an outer surface of a third adapter to pressurize or depressurize a first O-ring;
• the third adapter screw-coupled to inner surfaces of the second adapter and a fourth adapter, the first O-ring being disposed at one end portion thereof and a second O-ring being disposed at the other end portion thereof;
• the fourth adapter screw-coupled to the outer surface of the third adapter to pressurize or depressurize the second O-ring;
• the first and second O-rings elastically fixing an outer surface of a barrel of the IR objective lens by the expansion due to pressurizing forces of the second adapter and the fourth adapter;
• and
• an SIL holder mounting the SIL onto the first adapter.