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  • Sigma-Koki
  • Sigma-Koki
 
 
Sigma-Koki
Spectroscopy
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Sigma-Koki
ETL/EDL/NEDL (Excimer Laser Focusing Lenses)
  • ETL/EDL/NEDL (Excimer Laser Focusing Lenses)
  • These lenses are manufactured with a synthetic fused silica material and it has a high transmittance value in the ultra-violet wavelength of 180 − 400nm. They have excellent performance and ideal for focusing and imaging applications. There is no adhesive or heat absorption material used to produce these lenses, they show high resistance to the ultraviolet light.

▶These focusing lenses are made for use to image an object located in an infinitive distance or using a point of source as a parallel light. Near distance of an image will not produce any good optical result.
▶The correct direction to input a parallel light is on the top side of the SIGMA KOKI letters. If the direction is wrong, the spherical aberration will be big and the image unfocused.
▶If the wavelength is applied in-correctly, the spherical aberration and transmission will be bad.
▶Usage with high power laser or near high temperature light source, the high heat build-up in the lens may alter the focal length. To avoid this, heat prevention is required.
▶To reduce the focus spot size, ensure that the input beam diameter (1/e2) is reduced to half of the effective diameter of the focus lens.
▶These focusing lenses are not chromatic lenses; they are not optically corrected.
▶The lenses have 4% of reflectivity; therefore about over 20% of loss is expected in transmission.

Common Specifications
MaterialSynthetic fused silica for Excimer Laser
Design wavelength248nm
CoatingUncoated
Acceptance angle±1°

 

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