Compare Model Drawings, CAD & Specs Diameter Effective Focal Length (EFL) F/# Availability Price
Plano-Concave Lens, Fused Silica, 6.35 mm, -12.5 mm EFL, 1064 nm
$185
In Stock
6.35 mm -12.5 mm -2
In Stock
Plano-Concave Lens, Fused Silica, 12.7 mm, -25 mm EFL, 1064 nm
$185
In Stock
12.7 mm -25 mm -2
In Stock
Plano-Concave Lens, Fused Silica, 25.4 mm, -1000 mm EFL, 1064 nm
$153
In Stock
25.4 mm -1000 mm -39.4
In Stock
Plano-Concave Lens, Fused Silica, 25.4 mm, -250 mm EFL, 1064 nm
$152
In Stock
25.4 mm -250 mm -9.8
In Stock
Plano-Concave Lens, Fused Silica, 25.4 mm, -200 mm EFL, 1064 nm
$157
In Stock
25.4 mm -200 mm -7.9
In Stock
Plano-Concave Lens, Fused Silica, 25.4 mm, -150 mm EFL, 1064 nm
$157
In Stock
25.4 mm -150 mm -5.9
In Stock
Plano-Concave Lens, Fused Silica, 25.4 mm, -100 mm EFL, 1064 nm
$157
In Stock
25.4 mm -100 mm -3.9
In Stock
Plano-Concave Lens, Fused Silica, 25.4 mm, -75 mm EFL, 1064 nm
$157
In Stock
25.4 mm -75 mm -3
In Stock
Plano-Concave Lens, Fused Silica, 25.4 mm, -50 mm EFL, 1064 nm
$157
In Stock
25.4 mm -50 mm -2
In Stock
Plano-Concave Lens, Fused Silica, 50.8 mm, -1000 mm EFL, 1064 nm
$443
In Stock
50.8 mm -1000 mm -19.7
In Stock
Plano-Concave Lens, Fused Silica, 50.8 mm, -500 mm EFL, 1064 nm
$424
In Stock
50.8 mm -500 mm -9.8
In Stock
Plano-Concave Lens, Fused Silica, 50.8 mm, -250 mm EFL, 1064 nm
$470
In Stock
50.8 mm -250 mm -4.9
In Stock
Plano-Concave Lens, Fused Silica, 50.8 mm, -200 mm EFL, 1064 nm
$554
In Stock
50.8 mm -200 mm -3.9
In Stock
Plano-Concave Lens, Fused Silica, 50.8 mm, -150 mm EFL, 1064 nm
$610
In Stock
50.8 mm -150 mm -3
In Stock
Plano-Concave Lens, Fused Silica, 50.8 mm, -100 mm EFL, 1064 nm
$648
In Stock
50.8 mm -100 mm -2
In Stock

Specifications

  • Lens Shape
    Plano-Concave
  • Lens Material
    UV Fused Silica
  • Antireflection Coating
    1064 nm
  • Coating Type
    Laser Line V-Coat Multilayer
  • Coating Code
    AR.33
  • Damage Threshold
    7.5 J/cm2, 10 ns pulses, 20 Hz at 1064 nm
  • Surface Quality
    20-10 scratch-dig
  • Surface Accuracy, Irregularity
    λ/8
  • Surface Accuracy, Power
    1.5 λ
  • Surface Flatness
    λ/4
  • 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

High Quality Precision Plano-Convex Lens Surfaces

Our precision UV Fused Silica plano-convex lenses are polished to tight tolerances minimizing wavefront distortion. Tight surface quality tolerances minimize scatter and unwanted diffraction effects. These lenses have a 20-10 scratch-dig surface quality, and a λ/8 surface irregularity. For more information, refer to the optical surfaces technical note.

1064 nm Laser Line Antireflection V-Coating

Our AR.33 laser line V-coating offers the lowest reflectance at 1064 nm for maximum transmission while maintaining high durability and high damage resistance. Valuable laser energy is efficiently transmitted through the plano-convex lens rather than lost to surface reflection and scattering. The trade off to its superior performance is the minimal laser line wavelength range.

Standardized Plano-Concave Focal Lengths

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

Mounted Version - with Lens Tubes

The lenses can be mounted in LT series lens tube for constructing a complex optical system or quickly connecting to other threaded lens mounts: A-Line™ series fixed lens mount, or adjustable lens positioner (with thread adapter). Use LT-WR series spanner wrench for easy lens installation.

Expanding a Laser Beam with a Plano-Concave Lens

As an application example, consider a Newport R-31005 HeNe Laser with beam diameter 0.63 mm and a divergence of 1.3 mrad. Note that these are beam diameter and full divergence, so in the notation of our figure, y1 = 0.315 mm and θ1= 0.65 mrad. To expand this beam ten times while reducing the divergence by a factor of ten, we could select a plano-concave lens KPC043 with f1 = -25 mm and a plano-convex lens KPX109 with f2 = 250 mm. Since real lenses differ in some degree from thin lenses, the spacing between the pair of lenses is actually the sum of the back focal lengths BFL1 + BFL2 = -26.64 mm + 247.61 mm = 220.97 mm.

The expanded beam diameter is: 2y3 = 2y1f2/|-f1| = 2(0.315 mm)(250 mm)/|-25 mm|= 6.3 mm. 

The divergence angle is: θ3 = θ1|-f1|/f2 = (0.65 mrad)|-25 mm|/250 mm = 0.065 mrad.

For minimal aberrations, it is best to use a plano-concave lens for the negative lens and a plano-convex lens for the positive lens with the plano surfaces facing each other. To further reduce aberrations, only the central portion of the lens should be illuminated, so choosing oversized lenses is often a good idea. This style of beam expander is called Galilean.

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
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.