Patents by Inventor Leon Esterowitz

Leon Esterowitz has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6358243
    Abstract: A dual wavelength surgical laser system for performing laser surgery on living tissue with a minimum amount of collateral tissue damage is disclosed.
    Type: Grant
    Filed: August 4, 1995
    Date of Patent: March 19, 2002
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Leon Esterowitz, Charles L. Marquardt
  • Patent number: 5754572
    Abstract: A mirrorless, distributed-feedback (DFB), ultraviolet, tunable, narrow-liidth, solid state laser for remote sensing and medical applications is disclosed. Optical pumping in the DFB laser is accomplished using a frequency quadrupled, 10 Hz., Q-switched, Nd:YAG laser operating at 266 nm. The pump beam is diffracted off a grating (2400 grooves per mm.) into two parts. The two beams are subsequently recombined at the side face of the Ce:doped crystal (8 mm.times.8 mm.times.30 mm) at an angle of about 2.theta.(about 81 degrees). The resulting spatially periodic excitation within the Ce-doped gain medium due to the interferring pump beams determines the operating wavelength of the DFB laser.
    Type: Grant
    Filed: November 15, 1996
    Date of Patent: May 19, 1998
    Assignee: The United States of America as represented by the Sectary of the Navy.
    Inventors: Joseph F. Pinto, Leon Esterowitz
  • Patent number: 5487079
    Abstract: An ultraviolet solid state laser includes: (a) a laser cavity defined by a et of opposing mirrors, (b) a laser medium disposed in this laser cavity, where this medium includes a LiSrAIF.sub.6 (LiSAF) host material doped with enough cerium ions to produce a longitudinal mode laser emission when this laser medium is pumped; and (c) a source of pumping radiation.
    Type: Grant
    Filed: January 5, 1995
    Date of Patent: January 23, 1996
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Leon Esterowitz, Joseph F. Pinto
  • Patent number: 5388112
    Abstract: A room-temperature solid state laser for producing an output laser emission t any wavelength within a preselected range of wavelengths is disclosed.
    Type: Grant
    Filed: April 29, 1994
    Date of Patent: February 7, 1995
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Leon Esterowitz, Robert C. Stoneman, Joseph F. Pinto
  • Patent number: 5381428
    Abstract: A tunable ytterbium-doped solid-state laser has a laser cavity defined a r of mirrors, a laser medium positioned in this cavity, means for pumping the laser medium, and means for tuning the output of this laser medium to a selected wavelength within a wavelength range. The laser medium has a host material doped with enough ytterbium ions to produce a longitudinal mode laser emission when the laser medium is pumped. In a most preferred embodiment, the laser emission is frequency-doubled and tuned to a wavelength corresponding to a Fraunhoffer line in the solar spectrum.
    Type: Grant
    Filed: July 30, 1993
    Date of Patent: January 10, 1995
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: John M. McMahon, Robert C. Stoneman, Leon Esterowitz
  • Patent number: 5381433
    Abstract: A laser apparatus, system and method include a laser crystal formed of thulium-doped yttrium-lithium-fluoride, and a laser diode arranged in proximity to the laser crystal. The laser diode is capable of emitting a first laser light which is suitable for use as a pump beam for causing lasing to occur in the laser crystal. In response to the first laser light from the laser diode, the laser crystal emits a second laser light at a wavelength which is relatively highly-absorbed by organic tissue and/or water. The second laser light is therefore well-suited to medical applications, for example, and can be used to irradiate organic tissue for medical treatment.
    Type: Grant
    Filed: January 28, 1993
    Date of Patent: January 10, 1995
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Leon Esterowitz, Robert C. Stoneman
  • Patent number: 5313477
    Abstract: A continuous wave(CW) activator ion doped fiber laser is presented which lases at a normally self-terminating laser transition at a slope efficiency greater than that achieved by a self-terminating fiber laser. Two laser transitions, one corresponding to a self-terminating laser transition and the other to a transition out of the lower level of the self-terminating transition, are simultaneously stimulated in the activator ion doped fiber. Through simultaneous lasing of the two wavelengths corresponding to these transitions, the lower level of the self-terminating transition is sufficiently depopulated so that CW operation is achieved.
    Type: Grant
    Filed: October 30, 1992
    Date of Patent: May 17, 1994
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Leon Esterowitz, Roger E. Allen
  • Patent number: 5289482
    Abstract: In a preferred embodiment, a Tm.sup.3+ :YAG laser crystal and a Ho.sup.3+ :YAG laser crystal are placed within a reflective path of a laser cavity for intracavity pumping the Ho.sup.3+ :YAG laser crystal. The Tm.sup.3+ :YAG laser crystal emits a substantially 2.0 .mu.m laser emission after being resonantly end-pumped by a pump beam at a wavelength of about 785 nm and the substantially 2.0 .mu.m laser emission is used to pump the Ho.sup.3+ :YAG laser crystal. The intracavity-pumped Ho.sup.3+ :YAG laser crystal emits an output laser emission at substantially 2.1 .mu.m. The slope efficiency of the Ho.sup.3+ :YAG laser crystal output power is about 40% of the pump power absorbed by the Tm.sup.3+ :YAG laser crystal.
    Type: Grant
    Filed: December 30, 1992
    Date of Patent: February 22, 1994
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Leon Esterowitz, Robert S. Stoneman
  • Patent number: 5272708
    Abstract: A continuous wave modelocked laser is provided which generates output pul having a duration in the picosecond range at a repetition rate in the MHz to GHz ranges. The laser includes a laser cavity defined by spaced, opposed reflective member forming a reflective path therebetween; a host laser crystal disposed in the cavity; an acousto-optic modulator disposed between the host laser crystal and one reflective member for modulating the output of the host laser crystal; and a birefringent filter, disposed in the laser cavity between the host laser crystal and the one reflective member, for tuning the laser emission to any one of a plurality of wavelengths within a range between 1.86 .mu.m and 2.14 .mu.m. A pump source pumps the host laser crystal at a wavelength of substantially 785 nm. A collimating plano-convex lens is disposed so that the planar face thereof faces the laser crystal.
    Type: Grant
    Filed: October 30, 1992
    Date of Patent: December 21, 1993
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Leon Esterowitz, Joseph F. Pinto
  • Patent number: 5268920
    Abstract: An optical system for end-pumping the gain medium of a three-level or a self-terminating solid state laser with the optical output from a wide aperture laser diode bar is disclosed. In a preferred embodiment, the optical system includes: a laser diode bar for emitting from an elongated emissive area thereof a bright light having a lateral divergence and a transverse divergence; and an optical assembly disposed between the laser diode bar and the three-level solid state laser for collecting and focusing the bright light into a relatively small high-intensity spot to end-pump the gain medium of the three-level or self-terminating solid state laser.
    Type: Grant
    Filed: November 6, 1991
    Date of Patent: December 7, 1993
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Leon Esterowitz, Robert C. Stoneman, James G. Lynn
  • Patent number: 5206867
    Abstract: A flashpumped, tunable, two-micron, solid state laser is disclosed in which laser spiking is suppressed. The solid state laser comprises: a laser cavity defined by a first reflective element and an output coupler reflective element to form a reflective path therebetween; a laser crystal disposed in the laser cavity, the laser crystal having a host material doped with preselected activator ions sufficient to produce a pulse of laser emission at a desired laser transition wavelength in a range between about 1.9 microns and about 2.1 microns when the crystal is optically excited to produce the laser emission; a pulsed flashlamp for optically exciting the laser crystal to produce a pulse of laser emission at the desired laser transition wavelength; a tuner disposed in the laser cavity between the laser crystal and one of the reflective elements for tuning the laser emission to the desired laser transition wavelength in the range of wavelengths between about 1.9 microns and about 2.
    Type: Grant
    Filed: January 31, 1992
    Date of Patent: April 27, 1993
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Leon Esterowitz, Joseph F. Pinto
  • Patent number: 5200966
    Abstract: A laser system and method for producing a laser emission at a wavelength of substantially 2.8 microns and having a quantum efficiency of at least unity and a slope efficiency of about 36%. In a preferred embodiment of the invention, the laser system comprises a laser cavity defined by first and second reflective elements with one of the reflective elements operating as an output coupler; a crystal disposed in the laser cavity and having a GSGG host material doped with a preselected percent concentration of erbium, the GSGG host material and preselected percent concentration of erbium being selected so as to provide a quantum efficiency of at least unity by the .sup.4 I.sub.13/2 +.sup.4 I.sub.13/2 .fwdarw..sup.4 I.sub.9/2 +.sup.4 I.sub.15/2 upconversion process and a slope efficiency of about 36% when the crystal is resonantly pumped; and a resonant pump laser for directly pumping the .sup.4 I.sub.
    Type: Grant
    Filed: May 14, 1992
    Date of Patent: April 6, 1993
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Leon Esterowitz, Robert C. Stoneman
  • Patent number: 5107509
    Abstract: A tunable solid state laser for producing a laser emission at any desired w or high laser gain transition in a predetermined range of wavelengths is disclosed. The tunable solid state laser comprises: a laser cavity defined by a first reflective element and an output coupler reflective element to form a reflective path therebetween; a laser crystal disposed in the laser cavity; means for optically exciting the laser crystal to produce a laser emission in the predetermined range of wavelengths; a tunable element disposed in the laser cavity between the laser crystal and one of the reflective elements for tuning the laser emission to any desired laser transition in the predetermined range of wavelengths; and a plurality of optical plates oriented at Brewster's angle in the reflective path in the laser cavity for suppressing oscillation of undesired wavelengths within the laser cavity, the optical plates being transparent to the laser emission over the predetermined range of wavelengths.
    Type: Grant
    Filed: April 12, 1991
    Date of Patent: April 21, 1992
    Assignee: The United States of America as respresented by the Secretary of the Navy
    Inventors: Leon Esterowitz, Joseph F. Pinto, Gregory J. Quarles
  • Patent number: 5088103
    Abstract: A room temperature solid state laser for producing a laser emission at a wavelength of substantially 2.09 microns is disclosed. In a preferred embodiment, the laser includes: a laser cavity defined by first and second reflective elements opposing each other on a common axis to form a path therebetween; a laser crystal disposed in the laser cavity, the laser crystal having a host material capable of accepting Cr.sup.3+ sensitizer ions, Tm.sup.3+ sensitizer ions and Ho.sup.3+ activator ions; an amount of Cr.sup.3+ sensitizer ions between about 0.3% and about 2% dispersed within the host material; an amount of Tm.sup.3+ sensitzer ions between about 3% and about 12% dispersed within the host material; and an amount of Ho.sup.3+ activator ions between about 0.1% and about 0.7% dispersed within the host material; and flashlamp and means for exciting the laser crystal to produce a laser emission at substantially 2.09 microns with a slope efficiency of at least 4%, and preferably of at least 5%.
    Type: Grant
    Filed: April 30, 1990
    Date of Patent: February 11, 1992
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Leon Esterowitz, Gregory J. Quarles
  • Patent number: 5086432
    Abstract: A laser system and method for producing a laser emission at a wavelength of ubstantially 2.8 microns is disclosed. In a preferred embodiment of the invention, the laser system comprises a crystal having a host material doped with erbium; a laser cavity defined by first and second reflective elements at opposing ends of the crystal to form a reflective path therebetween; and resonant pumping means for directly pumping the .sup.4 I.sub.11/2 upper laser state of the erbium with a pump beam at a preselected wavelength to cause the erbium-doped crystal to produce a laser emission corresponding to the .sup.4 I.sub.11/2 .fwdarw..sup.4 I.sub.13/2 laser transition having a wavelength of substantially 2.8 microns, a portion of the laser emission at substantially 2.8 microns being outputted from one of the first and second reflective elements.
    Type: Grant
    Filed: May 23, 1991
    Date of Patent: February 4, 1992
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Leon Esterowitz, Robert C. Stoneman
  • Patent number: 5084880
    Abstract: A room temperature laser system for producing a CW Laser emission at substantially 2.7 microns is disclosed. In a preferred embodiment, the laser system comprises a laser diode source for producing a CW pump beam at a preselected wavelength; and a fiber laser doped with erbium activator ions to produce an output CW laser emission at a wavelength in the range of 2.71-2.78 microns when the fiber laser is pumped by the CW pump beam.
    Type: Grant
    Filed: July 2, 1990
    Date of Patent: January 28, 1992
    Assignee: The United States of America as represented by the Sectretary of the Navy
    Inventors: Leon Esterowitz, Roger E. Allen
  • Patent number: 5038353
    Abstract: A laser system employing thulium and holmium in a trivalent state. The quantum levels of interest in the thulium and holmium are coupled so that one pumping photo absorbed by the thulium results in two photons emitted by the holmium, making for an unusually efficient laser system. The lower level is sufficiently depopulated at room temperature to allow laser operation without cryogenics. In preferred embodiments, the laser pump can be a laser diode, itself especially efficient, and whose output frequency is closely matched in photon energy to the thulium quantum state of interest, thus lending additional efficiency to the overall system. The thulium and the holmium exist in an yttrium-aluminum garnet crystal as lattice replacements for yttrium.
    Type: Grant
    Filed: February 21, 1990
    Date of Patent: August 6, 1991
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Leon Esterowitz, Roger E. Allen, Gregory J. Kintz
  • Patent number: 5014279
    Abstract: A laser and method for producing a laser emission at a wavelength of substantially 2.8 microns is disclosed. In a preferred embodiment of the invention, the laser comprises laser diode means for emitting a pump beam at a preselected wavelength; a crystal; and a laser cavity defined by first and second reflective elements at opposing ends of the crystal to form a reflective path therebetween; the crystal having a preselected host material doped with a predetermined percent concentration of erbium activator ions sufficient to produce a laser emission at substantially 2.8 microns when the crystal is pumped by the laser diode means, a portion of the laser emission at substantially 2.8 microns being outputted from one of the first and second reflective elements at a slope efficiency of at least 5 percent, but preferably 10 percent, when the crystal is pumped by the pump beam.
    Type: Grant
    Filed: October 31, 1989
    Date of Patent: May 7, 1991
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Leon Esterowitz, Roger E. Allen, Gregory J. Kintz
  • Patent number: 5003547
    Abstract: A room temperature solid state laser for producing a laser emission at a wavelength of substantially 1.96 microns is disclosed. In a preferred embodiment, the laser includes: a laser cavity defined by a plurality of coated reflective elements to form a reflective path thereamong; a laser crystal disposed in the laser cavity and capable of lasing at substantially 1.96 mircons and 2.01 microns when excited; and means for exciting the laser crystal to lase at substantially 1.96 microns and at substantially 2.01 microns. The laser crystal is comprised of a host crystal material capable of accepting Cr.sup.3+ and Tm.sup.3+ ions. Through their respective reflectivities at each of the wavelengths at substantially 1.96 microns and 2.01 microns, the coated reflective elements collectively operate to produce substantial loss in radiation at the wavelength of substantially 2.
    Type: Grant
    Filed: December 29, 1989
    Date of Patent: March 26, 1991
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Leon Esterowitz, Gregory J. Quarles, Joseph F. Pinto
  • Patent number: 4969150
    Abstract: A room-temperature, solid state laser for producing a CW laser emission cinuously tunable over the approximate spectral range of 1.86 to 2.14 microns is disclosed. In a preferred embodiment, the laser comprises: a diode pump laser for producing a CW pump beam at a preselected wavelength; a laser cavity defined by first and second reflective elements opposing each other on a common axis to form a reflective path therebetween; a laser crystal disposed in the laser cavity, the laser crystal having a host material doped with a concentration of thulium activator ions sufficient to produce a CW laser emission in the range of a plurality of wavelengths determined by the Stark components in the .sup.3 F.sub.4 to .sup.3 H.sub.
    Type: Grant
    Filed: March 30, 1990
    Date of Patent: November 6, 1990
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Leon Esterowitz, Robert C. Stoneman