Name: 3mm Dia. x 4.5mm FL, NIR II Coated, Double-Convex Lens
Brand: TECHSPEC
SKU: 67-591
Price: $63.00

3mm Dia. x 4.5mm FL, NIR II Coated, Double-Convex Lens

Diameter (mm):

3.00 +0.0/-0.025

Back Focal Length BFL (mm):

3.78

Effective Focal Length EFL (mm):

4.50

Coating:

NIR II (750-1550nm)

Coating Specification:

R_abs ≤1.5% @ 750 - 800nm
R_abs ≤1.0% @ 800 - 1550nm
R_avg ≤0.7% @ 750 - 1550nm

N-BK7

Surface Quality:

20-10

Power (P-V) @ 632.8nm:

1.5λ

Irregularity (P-V) @ 632.8nm:

λ/4

Centering (arcmin):

30-45, typical

Center Thickness CT (mm):

2.00

Center Thickness Tolerance (mm):

±0.05

Edge Thickness ET (mm):

1.47

Radius R₁=-R₂ (mm):

4.29

Clear Aperture CA (mm):

2.5

f/#:

1.5

Focal Length Specification Wavelength (nm):

587.6

Focal Length Tolerance (%):

±1.00

Numerical Aperture NA:

0.33

Type:

Double-Convex Lens

Typical Energy Density Limit:

8 J/cm² @ 1064nm, 10ns

Wavelength Range (nm):

750 - 1550

8 J/cm² @ 1064nm, 10ns

Regulatory Compliance

RoHS 2015:

Compliant

Reach 224:

Compliant

Certificate of Conformance:

View

Product Family Description

AR Coated to Provide <0.7% Reflectance per Surface for 750 - 1550nm
Minimize Aberrations Including Spherical and Coma
UV Fused Silica DCX Lenses Available
Other Coating Options Available: Uncoated, MgF₂, VIS 0°, NIR I, VIS-EXT, VIS-NIR, and YAG-BBAR

TECHSPEC® NIR II Coated Double-Convex (DCX) Lenses, also referred to as bi-convex lenses, have two positive, symmetrical faces with equal radii on both sides. These lenses are generally recommended for finite imaging applications with a conjugate ratio (ratio between object distance and image distance) between 0.2 and 5. At a conjugate ratio of 1, aberrations such as spherical aberration, chromatic aberration, coma, and distortion are minimized or cancelled due to the symmetric lens design. TECHSPEC NIR II Coated Double-Convex Lenses are available in a variety of substrates and coating options for the visible and NIR spectra.