An important phenomenon in astronomy is polarization. Polarization data has been used to trace interstellar magnetic
fields in our galaxy as well as in radio galaxies via Faraday rotation. Spectrometers equipped with lasers to help remove
the blurring effects of atmospheric turbulence have advanced the collection of data of the known universe and advanced
theories on the physics of the early universe.
In this paper, the processes and results will be presented for an absorptive polarizer covering part of the visible (VIS) to
the near Infra - Red (IR) wavelengths. Linear polarizers are essential optical elements for many optical devices and
systems that are used in astronomy, astronomical instruments, telecommunications, aerospace/defense,
medical/biomedical etc. This patented all-glass polarizer has a polarization bandwidth of at least 400 nm and high
contrast ratio and transmission over the wavelength range of (600 to 1100) nm. It is monolithic, hence free of epoxy,
adhesive or optical cement. This state-of-the-art polarizer is an advance over current commercially available glass
polarizers which range from (633 to 2100) nm but with a typical polarization bandwidth of only 80 nm.
This new polarizer offers excellent optical properties, as well as high durability and consistency, which will provide
several advantages and benefits over technologies such as birefringent crystals and polarizing dielectric thin films
deposited on glass substrates. The applications for this polarizer include various optical measurement systems,
instruments and devices such as polarimetry systems, spectrometers, ellipsometers, optical modulators, imaging systems,
polarization dependent isolators and shutters.
In this paper, the processes and results will be presented for all glass polarizer covering the wavelength range of visible (VIS) to the near Infra-Red (IR) band. Currently, Corning Incorporated manufactures and commercializes several polarizers for nominal wavelengths ranging from 633 nm to 2100 nm. For each of these polarizers, the polarization bandwidth is about 80 nm, except for Polarcor W I D E Band product, which has a polarization bandwidth of 370 nm. The all-glass absorptive polarizer discussed in this paper has a polarization bandwidth of at least 400 nm and high Polarization Extinction Ratio (PER) over the bandwidth 600 nm to 1100 nm. The polarizer is monolithic, hence free of epoxy or optical cement. The polarizer spectrum of PER and % transmission without anti-reflection coating will be presented and discussed.
This new polarizer offers excellent optical properties, as well as high durability and consistency, which will offer several advantages and benefits when it is deployed in optical components, devices and systems. The applications for this polarizer may include: polarization dependent optical isolators, polarimetry systems, ellipsometers, electro-optics and liquid crystal modulators, and many other polarization based devices and systems. The new polarizer can be used in specialized governmental applications where Polarcor glass polarizers are presently used.
An optic fiber sensor based on the intermodal interference principle was integrated in a composite material structure to detect impacts and vibrations. Six fibers were integrated at the top of a carbon/epoxy composite panel and arranged to form a regular network on the structure. A series of impacts at various positions on the plate were performed using an instrumented hammer. The spectral responses of the optic sensors were compared to a reference piezoelectric accelerometer. Moreover a determination of the impacts position was performed with the arrival times measure of the generated acoustic wave front to the optic sensors. These tests proved the great sensitivity of this type of sensor, its integration easiness and the possibility to localize an impact on composite structures with a very simple device.