Compare Model Drawings, CAD & Specs Availability Price
SBC016
Bi-Concave Lens, Fused Silica, 25.4 mm, -1000 mm EFL, Uncoated
$148
In Stock
 SBC016 Bi-Concave Lens, Fused Silica, 25.4 mm, -1000 mm EFL, Uncoated
In Stock
 $148
SBC019
Bi-Concave Lens, Fused Silica, 25.4 mm, -250 mm EFL, Uncoated
$148
In Stock
 SBC019 Bi-Concave Lens, Fused Silica, 25.4 mm, -250 mm EFL, Uncoated
In Stock
 $148
SBC022
Bi-Concave Lens, Fused Silica, 25.4 mm, -200 mm EFL, Uncoated
$141
In Stock
 SBC022 Bi-Concave Lens, Fused Silica, 25.4 mm, -200 mm EFL, Uncoated
In Stock
 $141
SBC025
Bi-Concave Lens, Fused Silica, 25.4 mm, -150 mm EFL, Uncoated
$141
In Stock
 SBC025 Bi-Concave Lens, Fused Silica, 25.4 mm, -150 mm EFL, Uncoated
In Stock
 $141
SBC028
Bi-Concave Lens, Fused Silica, 25.4 mm, -100 mm EFL, Uncoated
$137
In Stock
 SBC028 Bi-Concave Lens, Fused Silica, 25.4 mm, -100 mm EFL, Uncoated
In Stock
 $137
SBC031
Bi-Concave Lens, Fused Silica, 25.4 mm, -75 mm EFL, Uncoated
$137
In Stock
 SBC031 Bi-Concave Lens, Fused Silica, 25.4 mm, -75 mm EFL, Uncoated
In Stock
 $137
SBC034
Bi-Concave Lens, Fused Silica, 25.4 mm, -50 mm EFL, Uncoated
$137
Contact Us
 SBC034 Bi-Concave Lens, Fused Silica, 25.4 mm, -50 mm EFL, Uncoated
Contact Us
 $137

Specifications

  • Lens Shape
    Bi-Concave (Double-Concave)
  • Lens Material
    UV Fused Silica
  • Antireflection Coating
    Uncoated
  • Surface Quality
    20-10 scratch-dig
  • Surface Flatness
    λ/2
  • Surface Accuracy, Irregularity
    λ/4
  • Surface Accuracy, Power
    1.5 λ
  • Centration
    ≤3 arc min
  • Chamfers
    0-0.8 mm face width
  • Chamfers Angle/Tolerance
    45° ±15°, typical
  • Focal Length Tolerance
    ±1 %
  • Diameter Tolerance
    +0/-0.1 mm
  • Center Thickness Tolerance
    ±0.1 mm
  • Clear Aperture
    ≥central 90% of diameter
  • Cleaning
    See How to Clean Optics

Features

UV Fused Silica Substrates for UV, Laserline & Broadband Applications

UV Grade Fused Silica is synthetic amorphous silicon dioxide of extremely high purity providing maximum transmission from 195 to 2100 nm. This non-crystalline, colorless silica glass combines a very low thermal expansion coefficient with good optical qualities, and excellent transmittance in the ultraviolet region. Transmission and homogeneity exceed those of crystalline quartz without the problems of orientation and temperature instability inherent in the crystalline form. It will not fluoresce under UV light and is resistant to radiation. For high-energy applications, the extreme purity of fused silica eliminates microscopic defect sites that could lead to laser damage. For more information, refer to our optical materials Technical Note

Ultraviolet Antireflection Coating

Our AR.10 broadband multilayer antireflection coating markedly improves the transmission efficiency of UVFS lenses in the 245 to 440 nm ultraviolet region.

Advantages to Uncoated Lenses

Uncoated lenses are used in optical systems and devices because they have an exceptionally wide wavelength range, a high damage threshold ratio, and without the expense of coatings, are always less expensive than their coated counterparts. Further, uncoated lenses give camera images a “vintage” look, which is becoming popular in cinema film production.

Standardized Bi-Concave Focal Lengths

Standard double concave effective focal lengths provide a systematic approach allowing for lenses of different sizes and materials to be interchanged without requiring other changes to your optical system.

Bi-Concave Lens Shape for Beam Expansion

Bi-Concave lenses are the best choice where object and image are at absolute conjugate ratios closer to 1:1 with converging input beam. The output rays appear to be diverging from a virtual image located on the object side of the lens. The distance from this virtual point to the lens is known as the focal length. Similar to the Plano-Concave lenses, the Bi-concave lenses have negative focal lengths, thereby causing collimated incident light to diverge. Bi-Concave lenses have equal radius of curvature on both side of the lens. They are generally used to expand light or increase focal length in existing systems, such as beam expanders and projection systems.

Mounting Options

We offer a full range of optical lens mounts to meet various experimental requirements. Below lists the recommended mounts for spherical lenses of standard sizes. Please see our Lens Mount Guide for additional information.

Note: besides the diameter, please check the Edge Thickness (Te) specification of the lens and the lens mount to ensure compatibility before purchasing. 

Lens Diameter LH-A-GRP
A-Line™ Lens Mounts		 LT_Series_group_update
LT Series Lens Tubes		 OM-multi_axis_lens_pos-S
LP Series Lens Positioners		 optics-cage-plus-S
Optics Cage Plus Series
76.2 mm (M-) LH-3A N/A N/A N/A
50.8 mm (M-) LH-2A
LH-2N		 LT20-05
LT20-10
LT20-20
LT20-30		 LP-2A
LP-2A-XY
LP-2A-XYZ		 N/A
38.1 mm (M-) LH-1.5A LT20 lens tube with
LH-2R1.5 adapter		 LP-2 lens positioner with
LPLH-1.5T adapter		 N/A
25.4 mm (M-) LH-1A
LH-1N
LH-1XY
LH-1TZ-A
LH-1TZ		 LT10-05
LT10-10
LT10-20
LT10-30		 LP-1A
LP-1A-XY
LP-1A-XYZ		 OC1-LH1-S
OC1-LH1
OC1-LH1-TZ
OC1-LH1-XY
OC1-LH1-XYA
OC1-LH1-XYC
OC1-LH1-XYZ
12.7 mm (M-) LH-0.5A
LH-05N		 LT05-05
LT05-10		 LP-05A
LP-05A-XY
LP-05A-XYZ		 N/A
6.35 mm LH-05DB with
LH-50R25 adapter		 LT05 lens tube with
LH-50R25 adapter		 LP-05 lens positioner with
LPLH-25T adapter		 N/A

For non-standard sizes not listed above, check out our variable size lens mounts.

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