61-6920-44 Achromatic Doublets φ10mm Focal Length 20mm DLB-10-20PM
Analyzer, Testing Equipment

61-6920-44 Achromatic Doublets φ10mm Focal Length 20mm DLB-10-20PM

model: 61-6920-44
brand: SIGMAKOKI CO., LTD.

Product Description

Product Model: 61-6920-44Product Brand: SIGMAKOKI CO., […]

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Product Details

Product Model: 61-6920-44
Product Brand: SIGMAKOKI CO., LTD.

Features

  • By combining two lenses with different refractive index wavelength dispersion into a single lens, chromatic aberration and spherical aberration can be reduced compared to a single spherical lens.
  • It can be ***d as a telescope objective lens or a collimating lens for laser experiments.
  • Optimization by lens design results in little change in focal length across the visible range.
  • Since not only chromatic aberration but also spherical aberration are well corrected, it is ideal as a collimating lens for laser.
  • It is corrected not only for aberrations of the on-axis object point, but also for off-axis coma and astigmatism.
  • It can be ***d for imaging systems such as telescope objective lenses and microscope imaging lenses.
  • It can be selected according to your specifications from a wide range of variations, subdivided by outer diameter size and focal length.
  • Air gap type condensing lens (NYTL/NYDL) for laser processing is also available.
  • * Use an achromatic lens when you want to focus an image at infinity or when you want to *** a point light source that is parallel to the image.
  • Sufficient optical performance cannot be obtained when the camera is ***d for close-range imaging.
  • * The chromatic lens has an orientation that allows parallel light to enter the lens.
  • * This function allows parallel light to enter from the side of the face with a small radius of curvature (the face pointed to by the arrow).
  • * When parallel light is incident from the opposite side, chromatic aberration and spherical aberration occur, and the condensing spot becomes larger.
  • Chromatic aberration may increase when the camera is ***d at wavelengths other than visible light.
  • * Also, transparency may be reduced.

Spec

  • [

    common specification]
  • Material: BK7, SF2
  • Design wavelength: Blue: 486.1nm, Green: 546.1nm, Red: 656.3nm
  • Coating: Reflective prevention film
  • Adhesive: Ultraviolet curing type adhesive
  • Laser durability: 0.3J/cm2 (pulse width 10ns, Repeat frequency 20Hz)
  • Scratch - dig: 40?20
  • Effective diameter: 90% of the outer diameter
  • [Individual specification]
  • Outer diameter φD: φ10mm
  • Focus distance f: 20mm
  • Edge thickness te: 5.1mm
  • Center thickness tc: 6.7mm
  • Back focus fb: 16.6mm
  • Eccentricity: <1′
  • RoHS conform product

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