Custom Geltech Aspheres Lenses


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Looking for a custom aspheric lens? LightPath's expert design team can complete new designs and provide prototypes in a matter of weeks while keeping development costs among the lowest in the industry.


LightPath has developed a   fully qualified molded glass catalog  that covers most design needs. The glasses in our standard catalog have been fully qualified with our process and will provide the most cost-effective lenses and enable the fastest turnaround times. AR coatings for these glasses have also been designed, tested and qualified.



Standard Glasses


LightPath manufactures aspheric lenses using several different types of glass. These glasses have been fully qualified along with the corresponding AR coating. Transmittance of all five glasses is very good over a large wavelength spectrum.


nd Abbe
CTE dn/dT Equivalent


LightPath exclusive


vd = 50.42

11.62 x 10-6 / °C

2.39 x 10-6 / °C


354xxx D-ZK3
High volume
1.586 vd = 60.71 7.6 x 10-6 / °C 3.2 x 10-6 / °C Hoya M-BACD5N &
Ohara L-BAL35
355xxx D-ZLaF52LA
High index
1.806 vd = 40.79 6.9 x 10-6 / °C 6.5 x 10-6 / °C

Ohara L-LAH53,
Hoya M-NBFD 130,

Sumita K-VC89

357xxx D-LaK6
  vd = 52.65 7.8 x 10-6 / °C 5.5 x 10-6 / °C Hoya M-LAC130 &
Ohara L-LAL13
356xxx L-LaL12   vd = 55.00 7.6 x 10-6 / °C 2.6 x 10-6 / °C CDGM & D-LaK5




Manufacturing Tolerances

The chart below describes the typical aspheric manufacturing tolerances. For custom design requirements please contact a LightPath representative.

LightPath's Typical Aspheric Manufacturing Tolerances*
Parameter Commercial (standard)
Effective Focal Length (EFL)

± 1%

Center Thickness (CT) ± 0.025 mm
Outer Diameter (OD) ± 0.015 mm
Wedge (arcmin) 4
Power/Irregularity (fringes) 3/1
Surface Roughness 15 nm
Surface Quality (scratch/dig) 40/20

*Manufacturability depends on size & shape of the optics, as well as production volume.







Anti-Reflective Coatings


LightPath offers a variety of multilayer broadband coatings to reduce the back reflection from a nominal 6% for uncoated lenses. The choice of which AR coating is appropriate depends on the type of glass the lens is made from and the wavelength at which the lens will be used. LightPath’s rigorous qualification process ensures that all of the standard coatings will pass the abrasion and adhesion resistance requirements of ISO 9211-4-1996. LightPath is happy to provide any AR coatings based on specific requirements.


Related Resources

Standard & Available Anti-Reflective Coatings Overview (PDF)







Molded in Place (MIP) Lenses


LightPath’s lenses can be molded directly into metallic holders, allowing the lenses to be welded or soldered into the package and eliminating the need to use epoxy. This can be an ideal solution for high volume automated assembly or in applications where strict outgassing requirements preclude the use of epoxy adhesives.




Shapes and Sizes

LightPath aspheric lenses are typically plano-convex or bi-convex with diameters as large as 25 mm or as small as 0.250 mm. LightPath has the capability to dice the lenses to specified shapes for easier mounting.

Diffractive Lenses


LightPath can extend the range of optimization on a lens by molding a diffractive pattern in the surface of the lens. This allows for a greater range of wavelength optimization and better achromatic performance.


Related Resources


Aspheric Hybrid Optics Overview (PDF 176 KB)




Molded Glass Lens Arrays


By utilizing LightPath’s molded lens technology it is now possible to manufacture lens arrays with high precision. Unlike etched lens arrays, where there is a great deal of non-uniformity from array to array, molding will consistently produce the same structure and performance from prototype to large production builds.    

Consistent focal lengths and form ease the manufacturing requirement for the end user. The molding technology also allows optical designs that require greater sag (lens thickness) such as high numerical aperture collimators for laser diode arrays. Lens arrays can be produced for direct coupling (finite conjugative) or collimating applications. Pitch tolerances are typically less than one micron and lenses can also be placed with varying pitches across the array.







Custom Lens Parameters

When determing specifications for custom aspheric lenses, the following parameters are typically used to specify lens performance. A LightPath product expert will be happy to discuss the following list of parameters with you to determine the appropriate lens for your application.



Wavelength Used (microns)
Numerical Aperture (NA)
Effective Focal Length (EFL) (mm)
Minimum Clear Aperture (mm)
Minimum Black Focal Length (mm)
Mechanical Space Contraints







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