Compare Model Drawings, CAD & Specs Diameter Effective Focal Length (EFL) F/# Availability Price
Bi-Concave Lens, Fused Silica, 25.4 mm, -1000 mm EFL, Uncoated
$141
In Stock
25.4 mm -1000 mm -39.4
In Stock
Bi-Concave Lens, Fused Silica, 25.4 mm, -250 mm EFL, Uncoated
$141
In Stock
25.4 mm -250 mm -9.8
In Stock
Bi-Concave Lens, Fused Silica, 25.4 mm, -200 mm EFL, Uncoated
$134
In Stock
25.4 mm -200 mm -7.9
In Stock
Bi-Concave Lens, Fused Silica, 25.4 mm, -150 mm EFL, Uncoated
$134
In Stock
25.4 mm -150 mm -5.9
In Stock
Bi-Concave Lens, Fused Silica, 25.4 mm, -100 mm EFL, Uncoated
$130
In Stock
25.4 mm -100 mm -3.9
In Stock
Bi-Concave Lens, Fused Silica, 25.4 mm, -75 mm EFL, Uncoated
$130
In Stock
25.4 mm -75 mm -3
In Stock
Bi-Concave Lens, Fused Silica, 25.4 mm, -50 mm EFL, Uncoated
$130
In Stock
25.4 mm -50 mm -2
In Stock

Specifications

  • Lens Shape
    Bi-Concave (Double-Concave)
  • Lens Material
    UV Fused Silica
  • Antireflection Coating
    Uncoated
  • Surface Quality
    20-10 scratch-dig
  • Surface Accuracy, Irregularity
    λ/8
  • Surface Accuracy, Power
    1.5 λ
  • Surface Flatness
    λ/8
  • 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

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.

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
76.2 mm (M-) LH-3A 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
38.1 mm (M-) LH-1.5A LT20 lens tube with LH-2R1.5 adapter LP-2 lens positioner with LPLH-1.5T adapter
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
12.7 mm (M-) LH-0.5A
LH-05N
LT05-05
LT05-10
LP-05A
LP-05A-XY
LP-05A-XYZ
6.35 mm LH-05DB with LH-50R25 adapter LT05 lens tube with LH-50R25 adapter LP-05 lens positioner with LPLH-25T adapter

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