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SfN Annual Meeting Neuroscience 2014
November 16-19
Washington DC, USA


Information > Application Notes

Information
01. Fabry-Perot Etalon
Fabry-Perot etalons are made-up of two partially reflecting mirrors parallel to each other. They are often used as frequency comb filters.
02. Fiber-coupling of LEDs depends on emitter type
Approaches differ for coupling edge- and surface-emitting LEDs into optical fiber, and the Lagrange invariant plays an important role in designing fiber-coupling optics.
03. Fiber-coupling of Laser Diode
Three differents configurations based on cylindrical lenses for efficient coupling of laser diodes into multimode and single mode optical fibers...
04. Fiber coupling efficiency calculation
A simple model can estimate coupling efficiency of laser diodes or LED directly to the optical fibers (butt-coupling)...
05. Laser Diode Collimation
The collimation of the highly divergent astigmatic beam coming from the laser diode requires a pair of cylindrical microlenses perpendicular to each other...
06. Optical Pumping with Laser Diode
In recent years, a pronounced trend toward laser diode pumping of solid state lasers has gained considerable interest...
07. Axicons
Axicon are optical component which can generate Bessel beams. Some basic properties of axicon and their uses are related in the following application note...
08. Aplanatic Points Of Ball Lenses
From the theory of aplanatic points of a sphere it follows that there exist two points such that a spherical wave from first point is transformed into a spherical wave diverging apparently from second.
09. Materials & Legend
Short list of common materials used to produce our optical components with some optical properties & list of all legend code use in the PDF files.
10. A high-brightness QCW pump source ...
A high-brightness QCW pump source using a pre-aligned GRIN lens array with refractive beam correction
11. Beam shaping improves diode-laser performance
Doric Lenses took part in ESA Living Planet Program on a project involving laser diode bar stack beam-shaping.

Some results of this project are outlined in an article published into Laser Focus World (Fri Jun 19 06:37:00 CDT 2009).

link to article.
12. Fiber-optic cannula with diffuser
In vivo optogenetics experiments require illumination or light stimulation of light sensitive neurons in specific areas of the brain. The light is introduced in brain via fiber-optic cannulas which consist of receptacle and optical fiber whose tip protrudes inside the brain. When the optical fiber is implanted in brain its tip delivers narrow cone of light in front of the fiber. The angular spread of light coming from a fiber tip is determined by the numerical aperture (NA) of the fiber. For example, the optical fiber with 0.22 NA spreads the light within the apex angle of 25.4° in air . When implanted or immersed into body liquids the angular spread of the light coming out of the fiber tip is reduced by the factor of 1.33 to 19.1°, where 1.33 is approximately the refractive index of the body liquids. As this angle is relatively small, some of the neurons of interest for optogenetics or electrophysiology experiments may not be illuminated.

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