David A Gibbs

US Patent:

20050137586, Jun 23, 2005

Filed:

Dec 22, 2004

Appl. No.:

11/020429

Inventors:

Gary Gray - Orlando FL, US
John Campin - Orlando FL, US
Steven Bott - Oviedo FL, US
David Gibbs - Orlando FL, US
George Pettit - Maitland FL, US

International Classification:

A61B018/20

US Classification:

606005000, 606010000

Abstract:

A system and method for tracking ocular changes during a surgical procedure include directing an eye-safe optical beam toward an undilated, unparalyzed eye. A reflected optical beam is detected, and measurements are performed based upon data contained in the reflected optical beam of at least one geometric parameter of the eye at a predetermined frequency, and from them is calculated a change in the at least one geometric parameter. The calculated change is used to dynamically adjust the directing of laser beam shots during the surgery.

US Patent:

54636485, Oct 31, 1995

Filed:

Aug 1, 1994

Appl. No.:

8/283542

Inventors:

David M. Gibbs - Apopka FL

Assignee:

Litton Systems, Inc. - Beverly Hills CA

International Classification:

H01S 300

US Classification:

372 38

Abstract:

A diode laser apparatus is heated at its junction by operating the diode at subthreshold current levels. A special bi-level pulse forming network (PFN) improves the efficiency in preheating the diode during non-operating or non-light producing modes along with the ability to supply the necessary drive during operating or light producing modes. This is accomplished by operating the laser diode at subthreshold or non-light producing current levels, which heats the diode at the diode junction directly where the heat is needed, and by the use of a bi-level pulse forming network which transfers the heating energy to the diode junction with high efficiency.

US Patent:

52837947, Feb 1, 1994

Filed:

Mar 1, 1993

Appl. No.:

8/024078

Inventors:

David M. Gibbs - Apopka FL
Robert D. Fischer - Winter Park FL

Assignee:

Litton Systems, Inc. - Little Falls NJ

International Classification:

H01S 313

US Classification:

372 30

Abstract:

A laser apparatus is provided in which a laser diode is driven with a plurality of drive pulses to generate a plurality of first laser pulses. Each first laser pulse occurs during a respective window and has a predetermined pulse width determined by a corresponding drive pulse. An electronic shutter which intercepts the laser beam is then opened in response to a trigger signal to permit a second laser pulse to be emitted from the laser rod during each window. The laser energy output of each of the second laser pulses from the laser rod is continuously monitored on a window by window basis to determine if the energy output of each of the second laser pulses exhibits a predetermined desired value. The energy output of the second laser pulse observed during each of the windows is then reported as a respective energy report signal set for each of the windows.

US Patent:

53032489, Apr 12, 1994

Filed:

Mar 1, 1993

Appl. No.:

8/024373

Inventors:

David M. Gibbs - Apopka FL

Assignee:

Litton Systems, Inc. - Beverly Hills CA

International Classification:

H01S 310

US Classification:

372 25

Abstract:

A laser apparatus or system is provided including a driving mechanism for driving a pulsed semiconductor laser which injects optical energy into a lasing medium. A digital filter is employed to adjust the time duration or pulse width of drive pulses which excite the semiconductor laser. In this manner, the irradiation of the lasing medium is adjusted by pulse width modulation of the driving current in the semiconductor laser. The laser apparatus employs a sampled output, digitally filtered, negative feedback signal to drive the semiconductor laser. This structure has the effect of making the semiconductor laser responsive to changes in the laser system or to undesired degradation in the laser system. The laser apparatus compensates for the inherent time lag in laser output power energy during initial startup of the laser.