Sarik R Nersisyan

7324286, Jan 29, 2008

Apr 6, 2006

11/399166

Leonid B Glebov - Orlando FL, US
Vasile Rotar - Orlando FL, US
Vadim I Smirnov - Orlando FL, US
Sarik Nersisyan - Winter Park FL, US
Nelson Tabirian - Winter Park FL, US

University of Central Florida Research Foundation - Orlando FL

G02B 3/00
G02B 9/00

359652, 359 30, 359618, 359634

Non-mechanical optical beam steering and switching is produced by optically controlled liquid crystal spatial light modulator with angular magnification by high efficiency volume Bragg gratings recorded in a photosensitive PTR glass. Small angle beam deflection in a photoactive liquid crystal cell is produced by exposing it to a controlling beam from an external source of radiation with predetermined distribution of power density which causes predetermined spatial gradients of a refractive index in a liquid crystal cell and, therefore, refraction of a controlled beam which is made to propagate in the region with spatial gradient of the refractive index. Large angle beam deflection is produced by a volume Bragg grating with angular selectivity adjusted in such way that small angle scanning produced by optically controlled liquid crystal spatial light modulator results in change of diffraction efficiency from zero to 100% for switching the beam for two Bragg angles.

20030206288, Nov 6, 2003

May 1, 2002

10/135572

Nelson Tabirian - Winter Park FL, US
Sarik Nersisyan - Winter Park FL, US

Beam Engineering for Advanced Measurement Co. - Winter Park FL

G01J001/00

356/121000

The objective of the present invention is providing a method and a simple instrument that can be used on a routine basis to accurately and quickly measure the focus position, waist radius, divergence, quality, power and power density of a laser beam. The measurement is performed by scanning a thin film of a nonlinear optical material in the focal region along the propagation direction of the beam and registering the variation of the on-axis intensity of the laser beam by a photodetector.

20040081218, Apr 29, 2004

Oct 25, 2002

10/280547

Nelson Tabirian - Winter Park FL, US
Sarik Nersisyan - Orlando FL, US

Beam Engineering for Advanced Measurement Co. - Winter Park FL

H01S003/22

372/058000

The objective of the present invention is providing a method and ultra light-weight instruments for controlling propagation of high energy laser beams. The control optical systems are based on gases and techniques for creating gas concentration and flow patterns that modulate the refractive index along the path of propagation of a laser beam.

20110188120, Aug 4, 2011

Jan 29, 2010

12/697083

Nelson Tabirian - Winter Park FL, US
Sarik Nersisyan - Orlando FL, US
Brian Kimball - Shrewsbury MA, US
Diane Steeves - Franklin MA, US

Beam Engineering for Advanced Measurement Co. - Winter Park FL

G02B 27/44

359573

The objective of the present invention is providing optical systems for controlling with propagation of light beams in lateral and angular space, and through optical apertures. Said light beams include laser beams as well as beams with wide spectrum of wavelengths and large divergence angles. Said optical systems are based on combination of diffractive waveplates with diffractive properties that can be controlled with the aid of external stimuli such as electrical fields, temperature, optical beams and mechanical means.

20110262844, Oct 27, 2011

Apr 21, 2010

12/662525

Nelson Tabirian - Winter Park FL, US
Sarik R. Nersisyan - Orlando FL, US
Brian R. Kimball - Shrewsbury MA, US
Diane M. Steeves - Franklin MA, US

Beam Engineering for Advanced Measurement Co. - Winter Park FL

G03H 1/00

430 2

The objective of the present invention is providing a method for fabricating high quality diffractive waveplates and their arrays that exhibit high diffraction efficiency over large area, the method being capable of inexpensive large volume production. The method uses a polarization converter for converting the polarization of generally non-monochromatic and partially coherent input light beam into a pattern of periodic spatial modulation at the output of said polarization converter. A substrate carrying a photoalignment layer is exposed to said polarization modulation pattern and is coated subsequently with a liquid crystalline material. The high quality diffractive waveplates of the present invention are obtained when the exposure time of said photoalignment layer exceeds by generally an order of magnitude the time period that would be sufficient for producing homogeneous orientation of liquid crystalline materials brought in contact with said photoalignment layer. Compared to holographic techniques, the method is robust with respect to mechanical noises, ambient conditions, and allows inexpensive production via printing while also allowing to double the spatial frequency of optical axis modulation of diffractive waveplates.

20130236817, Sep 12, 2013

Apr 11, 2013

13/860934

Sarik R. Nersisyan - Winter Park FL, US
Brian R. Kimball - Shrewsbury MA, US
Diane M. Steeves - Franklin MA, US

U.S. Government as represented by the Secretary of the Army - Natick MA

G03F 7/20

430 2, 355 71

The objective of the present invention is providing a method for fabricating high quality diffractive waveplates and their arrays that exhibit high diffraction efficiency over large area, the method being capable of inexpensive large volume production. The method uses a polarization converter for converting the polarization of generally non-monochromatic and partially coherent input light beam into a pattern of periodic spatial modulation at the output of said polarization converter. A substrate carrying a photoalignment layer is exposed to said polarization modulation pattern and is coated subsequently with a liquid crystalline material. The high quality diffractive waveplates of the present invention are obtained when the exposure time of said photoalignment layer exceeds by generally an order of magnitude the time period that would be sufficient for producing homogeneous orientation of liquid crystalline materials brought in contact with said photoalignment layer. Compared to holographic techniques, the method is robust with respect to mechanical noises, ambient conditions, and allows inexpensive production via printing while also allowing to double the spatial frequency of optical axis modulation of diffractive waveplates.

20180003874, Jan 4, 2018

Feb 28, 2014

14/193027

- Orlando FL, US
Sarik Nersisyan - Maitland FL, US

G02B 5/30
B05D 5/06
B05D 3/06

Method for fabrication of vector vortex waveplates of improved quality due to reduced singularity size and widened spectral band, the method comprising creating a boundary condition for vortex orientation pattern of a liquid crystal polymer on a substrate using materials with reversible photoalignment, equalizing exposure energy over the area of the waveplate by redistributing the energy of radiation used for photoalignment from the center of the beam to its peripheries, and using vector vortex waveplate as a linear-to-axial polarization converter. Fabrication of spectrally broadband vector vortex waveplates further comprises two or more liquid crystal polymer layers with opposite sign of twist.

20160033695, Feb 4, 2016

Jun 15, 2015

14/739240

- Natick MA, US
Sarik R. Nersisyan - Winter Park FL, US
Brian R. Kimball - Shrewsbury MA, US
Diane M. Steeves - Franklin MA, US

G02B 5/18
G02B 27/42

The objective of the present invention is providing optical systems for controlling with propagation of light beams in lateral and angular space, and through optical apertures. Said light beams include laser beams as well as beams with wide spectrum of wavelengths and large divergence angles. Said optical systems are based on combination of diffractive waveplates with diffractive properties that can be controlled with the aid of external stimuli such as electrical fields, temperature, optical beams and mechanical means.