US 11,916,351 B2
Methods and systems for improving single-frequency operations of diode lasers
Yushi Kaneda, Tucson, AZ (US)
Assigned to Arizona Board of Regents on Behalf of the University of Arizona, Tucson, AZ (US)
Appl. No. 17/263,686
Filed by Arizona Board of Regents on Behalf of the University of Arizona, Tucson, AZ (US)
PCT Filed Jul. 26, 2019, PCT No. PCT/US2019/043636
§ 371(c)(1), (2) Date Jan. 27, 2021,
PCT Pub. No. WO2020/023860, PCT Pub. Date Jan. 30, 2020.
Claims priority of provisional application 62/711,017, filed on Jul. 27, 2018.
Prior Publication US 2021/0296856 A1, Sep. 23, 2021
Int. Cl. H01S 5/06 (2006.01); H01S 5/00 (2006.01); H01S 5/065 (2006.01); H01S 5/068 (2006.01); H01S 5/14 (2006.01); G02F 1/35 (2006.01); G02F 1/355 (2006.01)
CPC H01S 5/0092 (2013.01) [H01S 5/0617 (2013.01); H01S 5/0653 (2013.01); H01S 5/06808 (2013.01); H01S 5/141 (2013.01); G02F 1/354 (2021.01); G02F 1/3507 (2021.01); G02F 1/3551 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method for determining a single-frequency operating current of a diode laser, comprising:
(a) ramping up an operational current of the diode laser for a first predetermined number of steps, and measuring an associated current value indicative of optical power within the laser diode for each of the first predetermined number of steps;
(b) ramping down the operational current of the diode laser for a second predetermined number of steps, and measuring an associated current value indicative of optical power within the laser diode for each of the second predetermined number of steps;
(c) using measured data obtained in operations (a) and (b) to identify current values at which a mode hop or a multimode operation is likely to occur; and
(d) determining a contiguous range of operating currents that is devoid of identified likely mode hops or multimode regions of operation as the operating current range of the diode laser having a single-frequency output, wherein the multimode operation is identified as a region having a negative slope followed by a region having substantially flat values for the current values indicative of the optical power as a function of the ramped up operating currents of the diode laser.