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DL-NM
Focal length f
Edge thickness te
Center thickness tc
Back focal length fb
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It is achromatic lens having a negative focal length. By setting the concave one bonding two lenses wavelength dispersion of the refractive index is different, can be smaller than the spherical single lens and spherical aberration and chromatic aberration.

◦It is optimized focal length shift is small in the visible light range, the aberration is minimized.
◦It can be the beam expander of Galileo type in combination with achromatic lens with a focal length of the positive.

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Guide

▶For custom focal lengths and diameter sizes not listed on-line or in our catalog please contact our Sales Division.

Attention

▶There is a direction to the incident parallel light to the achromatic lens. A surface with a small radius of curvature is allowed to be incident parallel light from a rear surface (the surface on the arrow is pointing to). When it is incident parallel light from the opposite side, spherical aberration and chromatic aberration will occur.
▶When used in the visible region, spherical aberration and chromatic aberration increases. In addition, the transmittance decreases.

Common Specifications
MaterialN-BAF10, N-SF10
Design wavelength486.1nm, 546.1nm, 656.3nm
CoatingAntireflection coating
CementUltraviolet Hardened Adhesive
Laser Damage Threshold0.3J/cm2
Surface Quality (Scratch-Dig)40-20
Clear aperture90% of actual aperture
Outline Drawing

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Schematic

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Incident direction of the parallel light

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Part Number

Catalog PDF

dxf

STP

IGS

SAT

Zemax

DL-25-50NM

DL-25-100NM

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    JP Yen Stock Qty
DL-25-50NM
DL-25-100NM

φ25mm

−49.94mm

9.3mm

6.7mm

−53.09mm

<3′

φ25mm

−99.94mm

5.9mm

4.6mm

−102.32mm

<3′

RoHS  

¥9,000

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RoHS  

¥9,000

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