A gyroscope system comprising: a gyroscope block having a plurality of cavities (18, 20, 22) and a plurality of passages (12, 14, 16) that define a path; three or more mirrors (24, 26, 28) each located in one of the plurality of cavities (18, 20, 22), each of the three or more mirrors (24, 26, 28) configured to direct light along the path defined by the plurality of cavities (18, 20, 22) and the plurality of passages; at least one mirror drive (60, 62) coupled to one of the three or more mirrors (24, 26, 28) and configured to change a position of the respective mirror, wherein the path's length is changed by the change in the position of the respective mirror; a photodetector configured to measure power of the light directed along the path; and a controller configured to provide a control signal indicative of an amplitude of path length control, PLC, alternating current, AC, modulation (PLC modulation) and indicative of a PLC frequency, and a direct current, DC, center position (DC center position) of the PLC modulation to the at least one mirror drive (60, 62); wherein the at least one mirror drive (60, 62) is responsive to the control signal to change the position of the respective mirror at the path length control frequency, wherein the at least one mirror drive (60, 62) moves based on the amplitude of PLC modulation; and characterized in that the controller is configured to increase the amplitude of PLC modulation during a startup phase of the gyroscope system; measure a laser power when the PLC modulation is near a maximum and when it is near a minimum; determine which of the maximum and minimum is associated with the higher laser power; shift the DC center position towards the higher laser power; determine that the DC center position is located at a peak laser power and therefore that a laser mode has been acquired by the gyroscope when the laser power associated with the maximum and minimum of the PLC modulation is approximately equal; decrease the amplitude of PLC modulation when the gyroscope system has acquired a laser mode. a gyroscope block having a plurality of cavities (18, 20, 22) and a plurality of passages (12, 14, 16) that define a path; three or more mirrors (24, 26, 28) each located in one of the plurality of cavities (18, 20, 22), each of the three or more mirrors (24, 26, 28) configured to direct light along the path defined by the plurality of cavities (18, 20, 22) and the plurality of passages; at least one mirror drive (60, 62) coupled to one of the three or more mirrors (24, 26, 28) and configured to change a position of the respective mirror, wherein the path's length is changed by the change in the position of the respective mirror; a photodetector configured to measure power of the light directed along the path; and a controller configured to provide a control signal indicative of an amplitude of path length control, PLC, alternating current, AC, modulation (PLC modulation) and indicative of a PLC frequency, and a direct current, DC, center position (DC center position) of the PLC modulation to the at least one mirror drive (60, 62); wherein the at least one mirror drive (60, 62) is responsive to the control signal to change the position of the respective mirror at the path length control frequency, wherein the at least one mirror drive (60, 62) moves based on the amplitude of PLC modulation; and characterized in that the controller is configured to increase the amplitude of PLC modulation during a startup phase of the gyroscope system; measure a laser power when the PLC modulation is near a maximum and when it is near a minimum; determine which of the maximum and minimum is associated with the higher laser power; shift the DC center position towards the higher laser power; determine that the DC center position is located at a peak laser power and therefore that a laser mode has been acquired by the gyroscope when the laser power associated with the maximum and minimum of the PLC modulation is approximately equal; decrease the amplitude of PLC modulation when the gyroscope system has acquired a laser mode.