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1.8mm Dia, 670nm DWL, 0.23mm WD, VIS Coated, GRIN Lens

Stock #64-538
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Diameter (mm):
1.80 +0.00/-0.01
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Aluminosilicate Glass Embedded with Silver Ions
Gradient Index Lens
Clear Aperture (%):
BBAR (640-700nm)
Coating Specification:
Ravg <0.5% @ 670nm ±30nm
Effective Focal Length EFL (mm):
Length (mm):
Length Tolerance (%):
Numerical Aperture NA:
Surface Quality:
Working Distance (mm):
Gradient Constant (mm-1):
Index of Refraction nd - Center of Lens:

Regulatory Compliance

RoHS 2015:
Reach 219:

Product Family Description

  • Ideal for Fiber Coupling and Laser Diode Applications
  • Comparable Performance to Conventional Aspherical Singlets
  • Multiple Sizes and Wavelength Options

Gradient Index (GRIN) lenses feature plane optical surfaces and achieve focus via a continuous change of the refractive index within the lens material. By eliminating complex geometries (such as aspherical surface figures) and carefully designing the lenses for specific working distances, these micro lenses are quite easy to handle and integrate into optical systems.

Our GRIN lenses are designed to provide a 0.55 numerical aperture, and are available in 2 working distance options. Lenses with a 0mm working distance are ideal for collimation of single and multi-mode optical fibers and laser diodes because the lens can be positioned and glued directly to the emission source. For focusing applications, or in instances where the lens can’t be in direct contact with the emission source, all lenses are available with a small working distance as well. Each lens is available uncoated (approximately 12% reflection loss), or with a BBAR coating option for R < 0.5%.

Laser Optics

Technical Information

Technical Information