US 12,083,045 B2
Calibrating the position of the focal point of a laser beam
Evi Goos, Heroldsbach (DE); Claudia Gorschboth, Nuremberg (DE); Matthias Foesel, Memmelsdorf (DE); and Olaf Kittelmann, Berlin (DE)
Assigned to ALCON INC., Fribourg (CH)
Filed by Alcon Inc., Fribourg (CH)
Filed on Feb. 7, 2020, as Appl. No. 16/785,046.
Claims priority of provisional application 62/807,593, filed on Feb. 19, 2019.
Prior Publication US 2020/0266601 A1, Aug. 20, 2020
Int. Cl. A61F 9/008 (2006.01); B23K 26/04 (2014.01); B23K 26/064 (2014.01); G02B 5/30 (2006.01); H01S 3/10 (2006.01)
CPC A61F 9/008 (2013.01) [B23K 26/04 (2013.01); B23K 26/064 (2015.10); H01S 3/10053 (2013.01); A61F 2009/00855 (2013.01); G02B 5/3083 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A system for calibrating a position of a focal point of a laser beam, comprising:
a laser configured to generate the laser beam;
a plurality of focusing optics configured to:
direct the focal point of the laser beam along a z-axis towards a zero-surface, the zero-surface corresponding to a zero-plane; and
receive at least a portion of the laser beam reflected by the zero-surface;
one or more detector optics configured to:
receive the reflected portion from the focusing optics; and
direct the reflected portion towards a two-photon absorption (TPA) detector;
the TPA detector configured to:
sense a peak intensity of the reflected portion, the peak intensity indicating a proximity of the position of the focal point of the laser beam to the zero-surface; and
generate a signal representing the peak intensity of the reflected portion; and
a computer configured to determine whether the position of the focal point of the laser beam is calibrated in response to the signal representing the peak intensity.