Liquid crystal devices especially for use in liquid crystal point diffraction interferometer systems

Title: Liquid crystal devices especially for use in liquid crystal point diffraction interferometer systems

Full Record
Other Related Research

Abstract

Liquid crystal point diffraction interferometer (LCPDI) systems that can provide real-time, phase-shifting interferograms that are useful in the characterization of static optical properties (wavefront aberrations, lensing, or wedge) in optical elements or dynamic, time-resolved events (temperature fluctuations and gradients, motion) in physical systems use improved LCPDI cells that employ a "structured" substrate or substrates in which the structural features are produced by thin film deposition or photo resist processing to provide a diffractive element that is an integral part of the cell substrate(s). The LC material used in the device may be doped with a "contrast-compensated" mixture of positive and negative dichroic dyes.

Inventors:

Marshall, Kenneth L ^[1]

Rochester, NY

Publication Date:: 2009-02-17

Research Org.:: The University of Rochester (Rochester, NY)

Sponsoring Org.:: USDOE

OSTI Identifier:: 988293

Patent Number(s):: 7,492,439

Application Number:: 10/945,753

Assignee:: The University of Rochester (Rochester, NY)

DOE Contract Number:: FC03-92SF19460

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: 47 OTHER INSTRUMENTATION

Citation Formats


                    Marshall, Kenneth L. Liquid crystal devices especially for use in liquid crystal point diffraction interferometer systems.  United States: N. p., 2009. 
        Web.

Copy to clipboard


                    Marshall, Kenneth L. Liquid crystal devices especially for use in liquid crystal point diffraction interferometer systems.  United States.

Copy to clipboard


                    Marshall, Kenneth L. Tue .  
        "Liquid crystal devices especially for use in liquid crystal point diffraction interferometer systems".  United States.  https://www.osti.gov/servlets/purl/988293.

Copy to clipboard


                    
@article{osti_988293,

  title        = {Liquid crystal devices especially for use in liquid crystal point diffraction interferometer systems},

  author       = {Marshall, Kenneth L},

  abstractNote = {Liquid crystal point diffraction interferometer (LCPDI) systems that can provide real-time, phase-shifting interferograms that are useful in the characterization of static optical properties (wavefront aberrations, lensing, or wedge) in optical elements or dynamic, time-resolved events (temperature fluctuations and gradients, motion) in physical systems use improved LCPDI cells that employ a "structured" substrate or substrates in which the structural features are produced by thin film deposition or photo resist processing to provide a diffractive element that is an integral part of the cell substrate(s). The LC material used in the device may be doped with a "contrast-compensated" mixture of positive and negative dichroic dyes.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/988293},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {2009},

  month        = {2}

}

Copy to clipboard

Patent:

View Patent

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Analyzing algorithms for nonlinear and spatially nonuniform phase shifts in the liquid crystal point diffraction interferometer. 1998 summer research program for high school juniors at the University of Rochester`s Laboratory for Laser Energetics: Student research reports

Technical Report Jain, N

Phase-shifting interferometry has many advantages, and the phase shifting nature of the Liquid Crystal Point Diffraction Interferometer (LCPDI) promises to provide significant improvement over other current OMEGA wavefront sensors. However, while phase-shifting capabilities improve its accuracy as an interferometer, phase-shifting itself introduces errors. Phase-shifting algorithms are designed to eliminate certain types of phase-shift errors, and it is important to chose an algorithm that is best suited for use with the LCPDI. Using polarization microscopy, the authors have observed a correlation between LC alignment around the microsphere and fringe behavior. After designing a procedure to compare phase-shifting algorithms, they were ablemore »« less
https://doi.org/10.2172/362525

Full Text Available
A Second-Generation, Liquid Crystal Phase-Shifting Point-Diffraction Interferometer Employing Structured Substrates

Conference Marshall, K L ; Adelsberger, K ; Kolodzie, B ; ... - Optical Diagnostics, edited by L. M. Hanssen and P. V. Farrell (SPIE, Bellingham, WA, 2005)

By design, point-diffraction interferometers are much less sensitive to environmental disturbances than dual-path interferometers, but, until very recently, have not been capable of phase shifting. The liquid crystal point-diffraction interferometer (LCPDI) utilizes a dye-doped, liquid crystal (LC) electro-optical device that functions as both the point-diffraction source and the phase-shifting element, yielding a phase-shifting diagnostic device that is significantly more compact and robust while using fewer optical elements than conventional dual-path interferometers.
Ray tracing through the liquid crystal point diffraction interferometer. 1998 summer research program for high school juniors at the University of Rochester`s Laboratory for Laser Energetics: Student research reports

Technical Report Turner, A

The Omega laser is a system with many different parts that may cause imperfections. There are a multitude of lenses and mirrors, for example, that may not be polished correctly and can cause the laser wave front to have aberrations. The Liquid Crystal Point Diffraction Interferometer (L.C.P.D.I.) is a device whose main purpose is to read the wave front of the laser and measure any aberrations that may be on it. The way the L.C.P.D.I. reads the laser wave front and measures these aberrations is very complicated and has yet to be perfected. A ray-tracing model of the L.C.P.D.I. hasmore »« less
https://doi.org/10.2172/362532

Full Text Available
Recent Advances in the Development of Phase-Shifting Liquid Crystal Interferometers for Visible and Near-IR Applications

Conference Marshall, K L ; Klehn, B ; Watson, B ; ...

(B204)- (OK to release per Gary Drew)Conventional phase-shifting interferometers are extremely sensitive to mechanical shock and transmitted vibration because they utilize separate test and reference optical paths that must be aligned to within a fraction of the wavelength of the light being used. Such interferometers are difficult and time consuming to set up, align, and maintain, and are costly due to the number of optics required for the dual-path design. Common-path interferometers such as the point-diffraction type are much less sensitive to environmental disturbances but until recently have not been capable of phase-shifting. The Liquid Crystal Point Diffraction Interferometer (LCPDI),more »« less
The LCPDI: A Compact and Robust Phase-Shifting Point-Diffraction Interferometer Based on Dye-Doped LC Technology

Conference Marshall, K L ; Adelsberger, K ; Myhre, G ; ... - Molecular Crystals and Liquid Crystals

Point-diffraction interferometers, by design, are much less sensitive to environmental disturbances than dual-path interferometers, but, until very recently, have not been capable of phase shifting. The liquid crystal point diffraction interferometer (LCPDI) utilizes a dye-doped, liquid crystal (LC), electro-optical device that functions as both the point-diffraction source and the phase-shifting element, yielding a phase-shifting diagnostic device that is significantly more compact and robust while also using fewer optical elements than conventional dual-path interferometers. These attributes make the LCPDI of special interest for diagnostic applications in the scientific, commercial, military, and industrial sectors, where vibration insensitivity, power requirements, size, weight, andmore » cost are critical issues.« less

Similar Records