Prism beam expander adjustment apparatus and method for adjusting the same

An apparatus for adjusting a prism beam expander, comprising

• a light source,
• a baseplate,
• a precise rotary stage,
• support columns,
• a two-dimensional slide stage,
• a first 90-degree bellcrank lever,
• an indication light source,
• a second 90-degree bellcrank lever,
• an optical filter,
• a photodetector,
• a computer, and
• an assembly platform,
• wherein the indication light source is fixed to a horizontal top end of the first 90-degree bellcrank lever;
• an indication beam emitted by the indication light source irradiates vertically downwards and is collinear with a rotating shaft of the precise rotary stage;
• a horizontal end of the second 90-degree bellcrank lever is fixed on the rotary surface of the precise rotary stage;
• the optical filter and the photodetector are fixed on a vertical top end of the second 90-degree bellcrank lever;
• the optical filter and the photodetector coaxially rotate with the precise rotary stage through the second 90-degree bellcrank lever;
• the computer drives the precise rotary stage to rotate through a controller of the precise rotary stage;
• and
• the light source is collinear with the optical filter and the photodetector.