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Aspheric Lenses

Photonics.com
Aug 2010
LightPath Technologies Inc.Request Info
 
ORLANDO, Fla., Aug. 11, 2010 — LightPath Technologies Inc. has introduced a family of four aspheric lenses designed for laser diodes operating at 405 or 488 nm and as the primary optics for collimating blue lasers in a variety of applications including biomedical instrumentation such as flow cytometers, microscopes and fluorescence spectroscopy equipment.

Suitable for use also in high-volume data storage systems, the diffraction-limited molded aspheric glass lenses have a compact single-lens design that is optimized for the specific beam divergences, peak wavelength and window material of commercial blue diode lasers to deliver good performance and beam quality.

The L-LAL12 and D-LaK6 glasses are fully RoHS-compliant and are available as mounted lenses in the company’s MT lens holders.

The356300 model is designed for 405 nm and has a numerical aperture of 0.66, a focal length of 2.54 mm, an outer diameter of 4 mm, a clear aperture of 3.30 mm and a working distance of 1.55 mm. The 356785 version at 488 nm has a numerical aperture of 0.62, a focal length of 1.42 mm, an outer diameter of 2.75 mm, a clear aperture of 1.70 and a working distance of 0.86 mm. At 488 nm, the 357765 model has a numerical aperture of 0.61, a focal length of 4.0 mm, an outer diameter of 6.325 mm, a clear aperture of 4.80 mm and a working distance of 2.37 mm. And the 357775, at 405 nm, has a numerical aperture of 0.60, a focal length of 4.02 mm, an outer diameter of 6.325 mm, a clear aperture of 4.80 mm and a working distance of 2.41 mm.

All of the blue laser lenses are available with proprietary standard MLBB-A antireflection coating for 400 to 600 nm.


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GLOSSARY
antireflection coating
A thin layer of material applied to a lens surface to reduce the amount of reflected energy. Ideally the index of refraction of that material should be equal to the square root of the product of the indices of the material on either side of the coating, while the ideal thickness for a single-layer coating is one-quarter of the wavelength at which reflectance is to be minimized. See also multilayer coating.
fluorescence spectroscopy
The spectroscopic study of radiation emitted by the process of fluorescence.
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