Semiconductor laser accelerator and laser acceleration unit thereof

A semiconductor laser accelerator, comprising:

• a plurality of laser acceleration units coupled in a cascade manner;
• and
• a controller configured for controlling excitation current supplied to each laser acceleration unit;
• wherein a space rectangular coordinate system xyz is defined, and each laser acceleration unit comprises:
• an active layer, having an active area;
• a first waveguide layer configured in front of the active layer in the Z-axis direction;
• an electrode configured in front of the first waveguide layer in the Z-axis direction;
• a second waveguide layer configured behind the active layer in the Z-axis direction;
• another electrode configured behind the second waveguide layer in the Z-axis direction;
• and
• two reflecting layers located in front of and behind the active layer, the first waveguide layer, and the second waveguide layer in a Y-axis direction;
• wherein the active area is configured to generate laser when the electrodes are energized, and the active layer extends in parallel to a plane defined by X-axis and Y-axis;
• wherein the first waveguide layer defines an acceleration channel extending along an X-axis direction, and one or two optical gratings configured on one or two sides of the acceleration channel to serve as an accelerating area;
• wherein the controller realizes control and adjustment of a phase of an electromagnetic field in the accelerating area by adjusting triggering time of the excitation current;
• wherein two Brewster windows for screening out lasers having a polarization direction parallel to the X-axis direction are formed in front of and behind the accelerating area in the Y-axis direction.