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N-BK7 Plano-Convex Lenses (High Power, V-Coated: 633 nm)


  • Positive Focal Length and Near Best Form for Infinite Conjugate Applications
  • AR V-Coats: 633 nm
  • R < 0.25% at 633 nm

LA1509-633

(Ø1")

LA1074-633

(Ø1/2")

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Common Specifications
Lens Shape Plano-Convex
Substrate Material N-BK7 (Grade A)a
Coating (V-Coat) 633 nm
Diameters Available 1/2" or 1"
Diameter Tolerance +0.00/-0.10 mm
Thickness Tolerance ±0.1 mm
Focal Length Tolerance ±1%
Surface Quality 20-10 Scratch-Dig
Design Wavelength 587.6 nm
Index of Refraction @ 633 nm 1.515
Reflectance @ 633 nm <0.25%
Surface Flatness
(Plano Side)
λ/2
Spherical Surface Powerb
(Convex Side)
3λ/2
Surface Irregularity
(Peak to Valley)
λ/4
Abbe # vd = 64.17
Centration ≤3 arcmin
Clear Aperture >90% of Diameter
Focal Length Tolerance ±1%
  • Click Link for Detailed Specifications on the Substrate
  • Much like surface flatness for flat optics, spherical surface power is a measure of the deviation between the surface of the curved optic and a calibrated reference gauge, typically for a 633 nm source, unless otherwise stated. This specification is also commonly referred to as surface fit.

Features

  • Material: N-BK7
  • AR V-Coated: 633 nm
  • Ø1/2" or Ø1" Plano-Convex Spherical Singlet Lenses

These Plano-Convex Lenses are fabricated from N-BK7 glass and feature laser line V-coats at 633 nm for use with popular high-power HeNe lasers with pulsed outputs up to 10 J/cm2. N-BK7 is a common optical glass that can be used for high-quality optical components. It is typically chosen whenever the additional benefits of UV fused silica (i.e., good transmission further into the UV and a lower coefficient of thermal expansion) are not necessary.

These plano-convex lenses are popular for many applications. They have a positive focal length and near-best-form shape for infinite and finite conjugate applications. Plano-convex lenses focus a collimated beam to the back focus and collimate light from a point source.

To minimize the introduction of spherical aberration, a collimated light source should be incident on the curved surface of the lens when being focused and a point light source should be incident on the planar surface when being collimated. The focal length of each lens can be calculated using a simplified thick lens equation. f= R/(n-1), where n is the index of refraction and R is the radius of curvature of the lens surface. These lenses are fabricated from N-BK7, which has an Abbe Number of 64.17; this value is an indicator of the dispersion.

V-Coating:
V-coating is a multilayer, antireflective, dielectric, thin-film coating that achieves lower reflectance over a narrower bandwidth when used within their design AOI range. Reflectance rises rapidly on either side of this minimum, giving the reflectance curve a “V” shape (see Graphs tab for performance plots). When compared to broadband AR offerings, dielectric V-coats achieve lower reflectance over a narrower bandwidth.

With a reflectance of less than 0.25% at the coating wavelength, these lenses provide exceptionally efficient transmittance and are ideal for use with HeNe lasers, as well as applications where light is transmitted through complex optical systems. Durable and capable of withstanding up to 10 J/cm2 (10 ns, 10 Hz), these V-coated spherical singlets are also particularly well-suited for high-power applications.

Optic Cleaning Tutorial
Optical Coatings and Substrates
Other N-BK7 Plano-Convex V-Coats
780 nm
532 / 1064 nm
Quick Links to Other Spherical Singlets
Plano-Convex Bi-Convex Best Form Plano-Concave Bi-Concave Positive Meniscus Negative Meniscus

Below is the transmission curve for N-BK7, a RoHS-compliant form of BK7. Total Transmission is shown for a 10 mm thick, uncoated sample and includes surface reflections. 

N-BK7 Transmittance
Click Here for Raw Data
Click to Enlarge


V-Coating:
V-coating is a multilayer, anti-reflective, dielectric, thin-film coating that achieves a theoretical minimum reflectance over a narrow band of wavelengths. Reflectance rises rapidly on either side of this minimum, giving the reflectance curve a “V” shape, as shown in the following preformance plots.

633 nm V-Coat Reflectance (AOI: 0 - 20°)

The plot on the right is an enlarged view of the shaded region:

N-BK7 Index of Refraction
Click to Enlarge

Click Here for Raw Data
In the thick lens equation, use the index of refraction for N-BK7 at the wavelength of interest to approximate the wavelength-dependent focal length of any of the plano-convex lenses.

The focal length of a thick spherical lens can be calculated using the thick lens equation below. In this expression, nl is the index of refraction of the lens, R1 and R2 are the radii of curvature for surfaces 1 and 2, respectively, and d is the center thickness of the lens.

thick lens equation.

When using the thick lens equation to calculate the focal length of a plano-convex lens, R1 = ∞ and R2 = -R. Note that the minus sign in front of R is due to the sign convention used when deriving the thick lens equations. Therefore, via substitution, the thick lens equation becomes

simple thick lens equation.

The focal length of the lens calculated using the simplified thick lens equation directly above is the distance between the second (back) principal plane (H") and the position at which a collimated beam incident on the curved surface of the plano-convex is focused. The principle plane positions of a thick lens can be calculated with the following equations:

principal plane equation one and Principal plane equation two.

However, as with the thick lens equation, H' simplifies to zero and H" simplifies to

Principal plane two simple

when used to calculate the principle plane locations of plano-convex lenses. fb is the back focal length of the lens, which is often referred to as the working distance of the lens.

CXY1 in 30 mm Cage System
Click to Enlarge

CXY1 Translation Mount and
SM1 Lens Tube Mounted in a
30 mm Cage System
Threaded Mounting Adapter
Click to Enlarge

Ø1" Optic Mounted in a
ST1XY-S XY Translator

Click to Enlarge

LMR1 Fixed Mount with Ø1" Lens

Click to Enlarge

LM2XY Translating Mount with Ø2" Lens
Recommended Mounting Options for Thorlabs Lenses
Item # Mounts for Ø2 mm to Ø10 mm Optics
Imperial Metric
(Various) Fixed Lens Mounts for Small Optics, Ø5 mm to Ø10 mm
(Various) Small Optic Adapters for Use with Standard Fixed Lens Mounts, Ø2 mm to Ø10 mm
Item # Mounts for Ø1/2" (Ø12.7 mm) Optics
Imperial Metric
LMR05 LMR05/M Fixed Lens Mount for Ø1/2" Optics
LM05XY LM05XY/M Translating Lens Mount for Ø1/2" Optics
SCP05 16 mm Cage System, XY Translation Mount for Ø1/2" Optics
(Various) Ø1/2" Lens Tubes,
Optional SM05RRC Retaining Ring for High-Curvature Lenses (See Below)
Item # Mounts for Ø1" (Ø25.4 mm) Optics
Imperial Metric
LMR1 LMR1/M Fixed Lens Mount for Ø1" Optics
LM1XY LM1XY/M Translating Lens Mount for Ø1" Optics
ST1XY-S ST1XY-S/M Translating Lens Mount with Micrometer Drives (Other Drives Available)
CXY1 30 mm Cage System, XY Translation Mount for Ø1" Optics
(Various) Ø1" Lens Tubes,
Optional SM1RRC Retaining Ring for High-Curvature Lenses (See Below)
Item # Mounts for Ø2" (Ø50.8 mm) Optics
Imperial Metric
LMR2 LMR2/M Fixed Lens Mount for Ø2" Optics
LM2XY LM2XY/M Translating Lens Mount for Ø2" Optics
CXY2 60 mm Cage System, XY Translation Mount for Ø2" Optics
(Various) Ø2" Lens Tubes,
Optional SM2RRC Retaining Ring for High-Curvature Lenses (See Below)
Item # Adjustable Optic Mounts
Imperial Metric
LH1 LH1/M Adjustable Mount for Ø0.28" (Ø7.1 mm) to Ø1.80" (Ø45.7 mm) Optics
LH2 LH2/M Adjustable Mount for Ø0.77" (Ø19.6 mm) to Ø2.28" (Ø57.9 mm) Optics
VG100 VG100/M Adjustable Clamp for Ø0.5" (Ø13 mm) to Ø3.5" (Ø89 mm) Optics
SCL03 SCL03/M Self-Centering Mount for Ø0.15" (Ø3.8 mm) to Ø1.77" (Ø45.0 mm) Optics
SCL04 SCL04/M Self-Centering Mount for Ø0.15" (Ø3.8 mm) to Ø3.00" (Ø76.2 mm) Optics
LH160C LH160C/M Adjustable Mount for 60 mm Cage Systems,
Ø0.50" (Ø13 mm) to Ø2.00" (Ø50.8 mm) Optics
SCL60C SCL60C/M Self-Centering Mount for 60 mm Cage Systems,
Ø0.15" (Ø3.8 mm) to Ø1.77" (Ø45.0 mm) Optics

Mounting High-Curvature Optics

Thorlabs' retaining rings are used to secure unmounted optics within lens tubes or optic mounts. These rings are secured in position using a compatible spanner wrench. For flat or low-curvature optics, standard retaining rings manufactured from anodized aluminum are available from Ø5 mm to Ø4". For high-curvature optics, extra-thick retaining rings are available in Ø1/2", Ø1", and Ø2" sizes.

Extra-thick retaining rings offer several features that aid in mounting high-curvature optics such as aspheric lenses, short-focal-length plano-convex lenses, and condenser lenses. As shown in the animation to the right, the guide flange of the spanner wrench will collide with the surface of high-curvature lenses when using a standard retaining ring, potentially scratching the optic. This contact also creates a gap between the spanner wrench and retaining ring, preventing the ring from tightening correctly. Extra-thick retaining rings provide the necessary clearance for the spanner wrench to secure the lens without coming into contact with the optic surface.


Posted Comments:
mohamed.boudhib  (posted 2014-06-19 09:23:23.193)
I noticed that your V-Coated lenses (particularly AR 1064/532) are not produced at a diameter of 2". Is it just stock-out ?
jlow  (posted 2014-07-14 12:17:00.0)
Response from Jeremy at Thorlabs: We do not stock the Ø2" version for these lenses. We can custom make these for you. We will contact you directly regarding this.
nkaddy  (posted 2014-03-25 19:19:22.127)
I noticed that none of your V-coated lenses come pre-mounted, is there a reason for this?
cdaly  (posted 2014-03-25 03:40:33.0)
Response from Chris at Thorlabs: We do not stock a mounted version of these lenses because we have not seen a high demand for this. These lenses can easily be mounted in 1 inch lens tube, either SM1L03 or SM1L10 depending on the optic thickness. This would not have engraving of the part number however. If this is needed we can likely provide it as a custom. I will contact directly to discuss this further.

Ø1/2" N-BK7 Plano-Convex Lenses (V-Coat: 633 nm)

Item #a Diameter Focal Length
(mm)
Diopterb Radius of Curvature
(mm)
Center Thickness
(mm)
Edge Thickness
(mm)
Back Focal Length
(mm)
Reference
Drawing
LA1540-633 1/2" 15.0 +66.6 7.7 5.1 1.8 11.56 Plano-Convex Lens Drawing
LA1074-633 1/2" 20.0 +50.0 10.3 4.0 1.8 17.30
LA1304-633 1/2" 40.0 +25.0 20.6 2.8 1.8 38.01
  • Suggested Fixed Lens Mount: LMR05(/M)
  • Reciprocal of the Focal Length in Meters
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LA1540-633 Support Documentation
LA1540-633f = 15.0 mm, Ø1/2", N-BK7 Plano-Convex Lens, 633 nm V-Coat
$33.55
Today
LA1074-633 Support Documentation
LA1074-633f = 20.0 mm, Ø1/2", N-BK7 Plano-Convex Lens, 633 nm V-Coat
$33.00
Today
LA1304-633 Support Documentation
LA1304-633f = 40.0 mm, Ø1/2", N-BK7 Plano-Convex Lens, 633 nm V-Coat
$30.84
Today

Ø1" N-BK7 Plano-Convex Lenses (V-Coat: 633 nm)

Item #a Diameter Focal Length
(mm)
Diopterb Radius of Curvature
(mm)
Center Thickness
(mm)
Edge Thickness
(mm)
Back Focal Length
(mm)
Reference
Drawing
LA1805-633 1" 30.0 +33.3 15.5 8.6 2.0 24.19 Plano-Convex Lens Drawing
LA1131-633 1" 50.0 +20.0 25.8 5.3 2.0 46.31
LA1608-633 1" 75.0 +13.3 38.6 4.1 2.0 72.02
LA1509-633 1" 100.0 +10.0 51.5 3.6 2.0 97.28
LA1433-633 1" 150.0 +6.7 77.3 3.1 2.0 149.50
LA1708-633 1" 200.0 +5.0 103.0 2.8 2.0 197.49
LA1908-633 1" 500.0 +2.0 257.5 2.3 2.0 496.81
LA1978-633 1" 750.0 +1.3 386.3 2.2 2.0 746.06
LA1464-633 1" 1000.00 +1.0 515.1 2.2 2.0 995.26
  • Suggested Fixed Lens Mount: LMR1(/M)
  • Reciprocal of the Focal Length in Meters
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LA1805-633 Support Documentation
LA1805-633f = 30.0 mm, Ø1", N-BK7 Plano-Convex Lens, 633 nm V-Coat
$36.26
Today
LA1131-633 Support Documentation
LA1131-633f = 50.0 mm, Ø1", N-BK7 Plano-Convex Lens, 633 nm V-Coat
$34.63
Today
LA1608-633 Support Documentation
LA1608-633f = 75.0 mm, Ø1", N-BK7 Plano-Convex Lens, 633 nm V-Coat
$34.08
Today
LA1509-633 Support Documentation
LA1509-633f = 100.0 mm, Ø1", N-BK7 Plano-Convex Lens, 633 nm V-Coat
$33.28
Today
LA1433-633 Support Documentation
LA1433-633f = 150.0 mm, Ø1", N-BK7 Plano-Convex Lens, 633 nm V-Coat
$32.47
Today
LA1708-633 Support Documentation
LA1708-633f = 200.0 mm, Ø1", N-BK7 Plano-Convex Lens, 633 nm V-Coat
$32.47
Today
LA1908-633 Support Documentation
LA1908-633f = 500.0 mm, Ø1", N-BK7 Plano-Convex Lens, 633 nm V-Coat
$32.20
Today
LA1978-633 Support Documentation
LA1978-633f = 750.0 mm, Ø1", N-BK7 Plano-Convex Lens, 633 nm V-Coat
$32.20
Today
LA1464-633 Support Documentation
LA1464-633f = 1000.0 mm, Ø1", N-BK7 Plano-Convex Lens, 633 nm V-Coat
$31.92
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