Ball and Drum Lenses

Ball lenses in their full sphere form have a long tradition of manufacture and use. However, from the parent ball lens, it is possible to derive other child lens types that can have an even more widespread use. 

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Ball lenses in their full sphere form have a long tradition of manufacture and use. However, from the parent ball lens, it is possible to derive other child lens types that can have an even more widespread use. If one side of the sphere is flattened and polished, we can obtain general plano-convex, half ball or aplanatic lenses depending on lens thickness. Additionally, by reducing the equatorial diameter of the sphere, we can obtain a drum version as well. We use a single code generator for any of these lens types that offers the choice of the following parameters:


To generate the code for your product, use the code generator below. Once created, copy the code in an email and send it at sales@doriclenses.com to request a quote.
The feasibility of the selected configuration is to be confirmed by the Sales department.

ORDERING CODE: BAL_Glass_D_d_t_S1(λ12)_S212)

Glass - Optical material,

D - Parent ball diameter in mm,

d - Drum diameter (<=D) in mm,

t - Optical thickness (<=D) in mm,

S1(λ12) - Coating and wavelength range specification on surface 1,

S2(λ12) - Coating and wavelength range specification on surface 2,


S1 and S2 are reserved for the lens coating specification code. The most common examples are provided in Preferred Coating Table. AR means Anti-reflective coating. Unless otherwise specified, R<0.5% across usable numerical aperture of the lens and within appropriate spectral range.
 
The Effective focal length (EFL) and Working distance (WD) of these lenses are dependent on the selected wavelength, glass material, parent ball diameter, central thickness and can be easily calculated. 

For the full ball EFL= n x D / 4 x (n-1) and WD = EFL x (2-n) / n

where n is the index of refraction of the selected glass and wavelength.


The thickness of the hemispherical lens is D/2.
The thickness of the aplanatic lens derived from a ball is D/2+D/2n.





CUSTOM CODE GENERATOR
Glass (see table):
Ball diameter - D (mm):
Drum diameter - d (mm):
Thickness - t (mm):
S1 coating (see table):
S2 coating (see table):
ORDERING CODE:
BAL_Glass_D_d_t_S1(λ12)_S2(λ12)
Preferred Ball Diameters (mm)
0.252.507.00
0.503.008.00
1.003.509.00
1.254.0010.00
1.505.00
2.006.00
Preferred Glasses
N-BK7
FS (Fused Silica)
UV-FS (UV Fused Silica)
N-LASF9
Sapphire
Silicon
S-TIH53
Coating Examples (λ1λ2 (nm))
AR(750-1100)AR(980)
NC = No coating
IN-STOCK BALL LENSES
Ordering CodeGlassDiameter (mm)Drum Diameter (mm)Thickness (mm)S1 Coating (λ1λ2 (nm))

S2 Coating (λ1 - λ2 (nm))

BAL_N-BK7_1.50_1.50_1.50_NC_NCN-BK71.501.501.50No coatingNo coating
BAL_FS_1.25_1.25_1.25_NC_NCFused Silica1.251.251.25No coatingNo coating
BAL_UV-FS_5.00_5.00_5.00_NC_NCUV Fused Silica5.005.005.00No coatingNo coating
BAL_Silicon_2.00_2.00_2.00_NC_NCSilicon2.002.002.00No coatingNo coating
BAL_N-LASF9_1.00_1.00_1.00_NC_NCN-LASF91.001.001.00No coatingNo coating
BAL_N-LASF9_3.98_3.98_3.98_AR(450-550)_AR(450-550)N-LASF93.983.983.98No coatingAR(450-550)
BAL_N-LASF9_5.00_5.00_5.00_NC_NCN-LASF95.005.005.00No coatingNo coating
BAL_N-LASF9_5.00_5.00_5.00_AR(800-1100)_AR(800-1100)N-LASF95.005.005.00AR(800-1100)AR(800-1100)
BAL_Sapphire_1.00_1.00_1.00_AR(1410)_AR(1410)Sapphire1.001.001.00AR(1410)AR(1410)
BAL_Sapphire_3.00_3.00_3.00_AR(800-1000)_AR(800-1000)Sapphire3.003.003.00AR(800-1000)AR(800-1000)
BAL_S-TIH53_10.57_10.57_10.57_NC_NCS-TIH5310.5710.5710.57No coatingNo coating

IN-STOCK DRUM BALL LENSES
Ordering CodeGlassDiameter (mm)Drum Diameter (mm)Thickness (mm)S1 Coating λ1λ2 (nm)S2 Coating λ1 - λ2 (nm)
BAL_FS_2.00_1.20_2.00_NC_NCFused Silica2.001.202.00No coatingNo coating
BAL_N-LASF9_8.00_4.00_8.00_NC_NCN-LASF98.004.008.00No coatingNo coating