Optical frequency stabilization apparatus for narrow spectral linewidth laser generation

A laser generation apparatus comprising:

• a light source configured to make oscillate a laser having a frequency that complies with an amount of current, based on the amount of the current that is applied thereto;
• a splitter configured to ramify a laser that is incident thereon at a preset ratio;
• an interference system configured to receive the ramified laser from the splitter, to generate an interference signal by ramifying a laser that is incident thereon, and to measure a phase of a laser that has oscillated;
• a temperature adjustment unit configured to uniformly maintain a temperature of a part of the interference system;
• an error integrator configured to receive a signal that has undergone the interference system and to accumulate a phase error that has occurred;
• a phase error detection unit configured to detect a phase difference between the signal that has undergone the error integrator and an offset current value;
• a driving driver configured to apply a current to drive the light source to the light source;
• and
• a control unit configured to control an operation of each component within the laser generation apparatus and to control the driving driver based on results of the detection of the phase error detection unit,
• wherein the splitter outputs some of the laser that is incident thereon to an outside and advances remaining laser toward the interference system,
• the error integrator comprises:
• an operational amplifier having a resistor disposed at an input stage thereof and having a capacitor connected thereto in a negative feedback form;
• and
• a switch connected to the capacitor in parallel and having an on/off adjusted depending on whether a reset signal is to be applied by the control unit,
• the operational amplifier increases a size of a phase error while accumulating an error through the capacitor included in the operational amplifier, and
• as the size of the phase error increases, a difference between a reference value for solving the phase error and a size of a feedback current according to a phase of the interference signal becomes relatively more accurate, and a relatively less time is taken for the feedback current to be incorporated into the light source.