公开(公告)号：US20220099961A1

公开(公告)日：2022-03-31

申请号：US17643584

申请日：2021-12-09

Applicant: AMO DEVELOPMENT, LLC

Inventor： Mohammad Saidur Rahaman ,  Hong Fu ,  Roger W. Accurso ,  Zenon Witowski

IPC: G02B26/08 ,  G01J1/42 ,  G02B27/10 ,  A61F9/008 ,  A61B3/13

Abstract: An ophthalmic laser system uses a non-confocal configuration to determine a laser beam focus position relative to the patient interface (PI) surface. The system includes a light intensity detector with no confocal lens or pinhole between the detector and the objective lens. When the objective focuses the light to a target focus point inside the PI lens at a particular offset from its distal surface, the light signal at the detector peaks. The offset value is determined by fixed system parameters, and can also be empirically determined by directly measuring the PI lens surface by observing the effect of plasma formation at the glass surface. During ophthalmic procedures, the laser focus is first scanned insider the PI lens, and the target focus point location is determined from the peak of the detector signal. The known offset value is then added to obtain the location of the PI lens surface.

公开(公告)号：US20220062049A1

公开(公告)日：2022-03-03

申请号：US17446018

申请日：2021-08-26

Applicant: AMO Development, LLC

Inventor： Hong Fu ,  Mohammad Saidur Rahaman ,  Alireza Malek Tabrizi ,  Zenon Witowski ,  Griffith Altmann

IPC: A61F9/008

Abstract: A method for forming deep corneal lamellar incision parallel to the posterior corneal surface when the eye is docked to the patient interface. A lower-energy detecting beam generated by the same pulsed laser that generates the higher-energy treatment laser beam is utilized to measure the posterior corneal surface profile. The detecting beam is scanned in the eye according to a first 3-dimensional scan pattern, while intensity of the back-reflected light is measured by a light intensity detector. The first scan pattern may be a spiral pattern in the X-Y plane coupled with a Z direction oscillation function. Peaks of the light intensity signal are detected, and corresponding spatial positions of the focus point are obtained; a known offset distance is added to the depth value to obtain the posterior corneal surface profile. Based thereon, the treatment laser beam is scanned in the eye to form the deep corneal lamellar incision.

公开(公告)号：US20210275017A1

公开(公告)日：2021-09-09

申请号：US17057105

申请日：2019-11-11

Applicant: AMO Development, LLC

Inventor： Zenon Witowski ,  Mohammad Saidur Rahaman ,  Daryl Wong

IPC: A61B3/14 ,  A61B3/00 ,  A61F9/008

Abstract: An imaging system for an ophthalmic laser system includes a prism cone made of a transparent optical material and disposed downstream of the focusing objective lens of the ophthalmic laser system, the prism cone having an upper surface, a lower surface parallel to the upper surface, a tapered side surface between the upper and lower surfaces, and a beveled surface formed at an upper edge of the prism cone and intersecting the upper surface and the side surface, and a camera disposed adjacent to the prism cone and facing the beveled surface. The camera is disposed to directly receive light that enters the lower surface of the prism cone and exits the beveled surface without having been reflected by any surface.

公开(公告)号：US20180221200A1

公开(公告)日：2018-08-09

申请号：US15888997

申请日：2018-02-05

Applicant: AMO DEVELOPMENT, LLC

Inventor： Zenon J. Witowski ,  Mohammad Saidur Rahaman

IPC: A61F9/008 ,  H01S3/081 ,  G02B26/08 ,  H01S3/08

CPC classification number: A61F9/008 ,  A61F9/0084 ,  A61F2009/00872 ,  G02B5/0816 ,  G02B26/0816 ,  G02B26/101 ,  H01S3/0057 ,  H01S3/08009 ,  H01S3/0812 ,  H01S3/0816

Abstract: A femtosecond laser system for ophthalmic applications, which employs a number of chirped mirrors in the laser beam delivery system between the laser head and the objective lens. The chirped mirrors perform the dual function of both turning the laser beam in desired directions and compensating for beam broadening due to group delay dispersion (GDD) of the optical elements of the system. Each chirped mirror reflects the laser beam only once. Four chirped mirrors are used, each providing up to −5000 fs2 of negative GDD per bounce, to provide a total of −18,000 fs2 negative GDD to compensate for the positive GDD of +18,000 fs2 introduced by other optical elements in the laser beam delivery system. This eliminates the need for a pulse compressor that would employ a grating pair, prism pair or grism pair, and therefore significantly reduces the size of the system and the alignment requirements.