High-precision repetition rate locking apparatus for ultra-fast laser pulse

A high-precision repetition rate locking apparatus for an ultra-fast laser pulse, comprises:

• an electronic controlling component, configured to provide a high-precision radio-frequency electrical pulse signal, and comprising:
• a standard clock, configured to provide a high-precision frequency standard;
• a pulse generator (PG), configured to provide an electrical pulse signal with adjustable repetition rate, pulse width and voltage magnitude;
• a signal generator (SG), connected to the standard clock and the PG, and configured to provide a stable frequency signal for the PG;
• a loop mirror, connected to the electronic controlling component;
• a phase-shift adjusting component, disposed in the loop mirror and connected to the electronic controlling component, and configured to implement phase modulation through electrically induced refractive index change of a crystal in the phase-shift adjusting component;
• a resonant cavity component, comprising a phase shifter, a doped fiber, a laser diode, a wavelength division multiplexer and a reflector, and configured to generate a mode-locked pulse;
• and
• a detecting component, configured to measure a repetition rate of an output pulse;
• wherein the detecting component comprises a photoelectric detector and a frequency counter.