Autocorrelator and pulse amplifying device including same

An autocorrelator comprising:

• a parabolic mirror configured to transmit and reflect pulse laser beam;
• a prism disposed on one side of the parabolic mirror to split the pulse laser beam;
• a first lower retro-reflector disposed under the prism and provided at a first distance from the prism to reflect a portion of the pulse laser beam;
• a first upper retro-reflector portion disposed on the prism, provided at a second distance different from the first distance from the prism, and configured to reflect another portion of the pulse laser beam to generate a first time difference between pulses of the pulse laser beam;
• a first sensor disposed under the parabolic mirror and configured to receive the pulse laser beam and detect a pulse width of the pulse laser beam;
• first and second beam splitters disposed on an other side of the prism facing the parabolic mirror;
• a second lower retro-reflector disposed below the first and second beam splitters and provided at a third distance from the first beam splitter to reflect a portion of the pulse laser beam;
• and
• a second upper retro-reflector disposed above the first and second beam splitters, provided at a fourth distance different from the third distance from the second beam splitter, and configured to reflect another portion of the pulse laser beam to reflect another portion of the pulse laser beam to generate a second time difference between the pulses of the pulse laser beam.

A pulse amplifying device comprising:

• a pulse oscillator configured to generate pulses of a pulse laser beam;
• an expander disposed adjacent to the pulse oscillator and expanding a pulse width of the pulse laser beam;
• a compressor disposed adjacent to the expander and configured to compress the pulse width of the pulse laser beam;
• and
• an autocorrelator disposed adjacent to the compressor and configured to adjust the pulse width by measuring the pulse width,
• wherein the autocorrelator comprises:
• a parabolic mirror configured to transmit and reflect pulse laser beam;
• a prism disposed on one side of the parabolic mirror and configured to split the pulse laser beam;
• a first lower retro-reflector disposed under the prism and provided at a first distance from the prism to reflect a portion of the pulse laser beam;
• a first upper retro-reflector disposed on the prism, provided at a second distance different from the first distance from the prism, and configured to reflect another portion of the pulse laser beam to generate a first time difference between pulses of the pulse laser beam upper;
• and
• a first sensor disposed under the parabolic mirror and configured to receive the pulse laser beam to detect a pulse width of the pulse laser beam.