Common Specifications*
Lens Shape	Convex/Convex
Diameters Available	Ø5 mm, Ø6 mm, Ø1/2", Ø1", or Ø2"
Diameter Tolerance	+0.00 mm / -0.10 mm
Substrate Material	UV Grade Fused Silica
Focal Length Tolerance	±1%
Surface Quality	40-20 Scratch-Dig
Spherical Surface Power	3λ/2
Spherical Surface Irregularity	λ/4
Clear Aperture	>90% of Dia.
Design Wavelength	588 nm
Index of Refraction (@ Design λ)	1.460
Centration	≤3 arcmin

*These lenses are also available with AR coatings for wavelength ranges 290 - 370 nm (-UV), 350 - 700 nm (-A), 650 - 1050 nm (-B), and 1050 - 1620 nm (-C).

Bi-Convex Lens Selection Guide
N-BK7	Uncoated -A (350 - 700 nm) -B (650 - 1050 nm) -C (1050 - 1620 nm)
UV Fused Silica	Uncoated -UV (290 - 370 nm) -A (350 - 700 nm) -B (650 - 1050 nm) -C (1050 - 1620 nm)
CaF₂	Uncoated -E (3 - 5 µm)
ZnSe	-F (8 - 12 µm)

Custom Coatings are also available. Please contact our technical support staff for a quote.

Features

5 Different Diameters Available: Ø5 mm, Ø6 mm, Ø1/2", Ø1", and Ø2"
Wavelength Range: 185 nm - 2.1 μm (uncoated)
Focal Lengths Available from 10.0 - 1000.0 mm
Fabricated from UV Grade Fused Silica

Thorlabs' UV Grade Fused Silica Bi-Convex Lenses are available here uncoated. UV-grade fused silica offers high transmission in the deep UV and exhibits virtually no laser-induced fluorescence (as measured at 193 nm), making it an ideal choice for applications from the UV to the near IR. In addition, UV fused silica has better homogeneity and a lower coefficient of thermal expansion than N-BK7.

Bi-convex lenses are popular for many finite imaging applications. Both surfaces are spherical and have the same radius of curvature, minimizing aberrations in situations where the object and image distances are equal or nearly equal. As a guideline, bi-convex lenses are the best choice for minimizing aberrations if the conjugate ratio (object distance : image distance) is between 5:1 and 1:5. Outside this range, plano-convex lenses are usually preferred.

Thorlabs offers these bi-convex lenses in sizes ranging from Ø5 mm to Ø2". Each size is compatible with a multitude of Thorlabs lens mounts. Please see the Mounting Options tab for details.

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 a 10 mm thick uncoated sample of UV fused silica when the incident ilght is normal to the surface. Please note that this is the measured transmission, including surface reflections.

Click Here for Raw Data
Click to Enlarge

Recommended Mounting Options for Ø6 mm Lenses
Item #	Description
LMR05 with LMRA6	Lens Mount for Ø1/2" Optics with Ø6 mm Optic Adapter
LH1	Adjustable Lens Mount: 0.2" (5 mm) to 1.82" (46 mm)
SCL03	Self-Centering Lens Mount, Ø0.15" (3.8mm) to Ø1.7" (43mm)
SCL04	Self-Centering Lens Mount, Ø0.15" (3.8mm) to Ø3.0" (76mm)
Recommended Mounting Options for Ø9 mm Lenses
LMR05 with LMRA9	Lens Mount for Ø1/2" Optics with Ø9 mm Optic Adapter
LH1	Adjustable Lens Mount: 0.2" (5 mm) to 1.82" (46 mm)
SCL03	Self-Centering Lens Mount, Ø0.15" (3.8mm) to Ø1.7" (43mm)
SCL04	Self-Centering Lens Mount, Ø0.15" (3.8mm) to Ø3.0" (76mm)
Recommended Mounting Options for Ø1/2" (12.7 mm) Lenses
LH1	Adjustable Lens Mount: 0.2" (5 mm) to 1.82" (46 mm)
SCL03	Self-Centering Lens Mount, Ø0.15" (3.8mm) to Ø1.7" (43mm)
SCL04	Self-Centering Lens Mount, Ø0.15" (3.8mm) to Ø3.0" (76mm)
LMR05	Fixed Lens Mount for Ø1/2" Optics
LMR05S	Ø1/2" Lens Mount with Internal and External SM05 Threads
SM05L10	Thorlabs offers a range of Ø1/2" lens tube designs and lengths
LM05XY or LM05XY/M	Translating Lens Mount for Ø1/2" Optics
SCP05	16 mm Cage-System-Compatible XY Translator for Ø1/2" Optics
Recommended Mounting Options for Ø1" (25.4 mm) Lenses
LH1	Adjustable Lens Mount: 0.2" (5 mm) to 1.82" (46 mm)
LH2	Adjustable Lens Mount: 0.75" (19 mm) to 2.25" (57 mm)
SCL03	Self-Centering Lens Mount, Ø0.15" (3.8mm) to Ø1.7" (43mm)
LMR1	Fixed Lens Mount for Ø1" Optics
LMR1S	Ø1" Lens Mount with Internal and External SM1 Threads
SM1L10	Thorlabs offers a range of Ø1" lens tube designs and lengths
LM1XY or LM1XY/M	Translating Lens Mount for Ø1" Optics
HPT1	30 mm Cage-System-Compatible XY Translator for Ø1" Optics
VG100	Adjustable-Height Optic Clamp
Recommended Mounting Options for Ø2" (50.8 mm) Lenses
LH2	Adjustable Lens Mount: 0.75" (19 mm) to 2.25" (57 mm)
SCL04	Self-Centering Lens Mount, Ø0.15" (3.8mm) to Ø3.0" (76mm)
LMR2	Fixed Lens Mount for Ø2" Optics
LMR2S	Ø2" Lens Mount with Internal and External SM2 Threads
SM2L10	Thorlabs offers a range of Ø2" lens tube designs and lengths
LM2XY or LM2XY/M	Translating Lens Mount for Ø2" Optics
VG100	Adjustable-Height Optic Clamp

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Item #

Diameter

Focal Length

Radius of Curvature

Center Thickness

Edge Thickness

Back Focal Length

Reference
Drawing

LB4743

5.0 mm

10.0 mm

8.8 mm

2.2 mm

1.5 mm

9.2 mm

Item #

Diameter

Focal Length

Radius of Curvature

Center Thickness

Edge Thickness

Back Focal Length

Reference
Drawing

LB4280

6.0 mm

10.0 mm

8.8 mm

2.6 mm

1.5 mm

9.1 mm

LB4537

6.0 mm

15.0 mm

13.4 mm

2.2 mm

1.5 mm

14.2 mm

LB4738

6.0 mm

20.0 mm

18.1 mm

2.0 mm

1.5 mm

19.3 mm

Item #

Diameter

Focal Length

Radius of Curvature

Center Thickness

Edge Thickness

Back Focal Length

Reference
Drawing

LB4854

1/2"

20.0 mm

17.7 mm

4.2 mm

1.8 mm

18.5 mm

LB4003

1/2"

30.0 mm

27.1 mm

3.3 mm

1.8 mm

28.8 mm

LB4700

1/2"

40.0 mm

36.3 mm

2.9 mm

1.8 mm

39.9 mm

LB4915

1/2"

50.0 mm

45.6 mm

2.7 mm

1.8 mm

49.1 mm

Item #

Diameter

Focal Length

Radius of Curvature

Center Thickness

Edge Thickness

Back Focal Length

Reference
Drawing

LB4879

35.0 mm

31.0 mm

7.4 mm

2.0 mm

32.4 mm

LB4030

40.0 mm

35.7 mm

6.7 mm

2.0 mm

37.6 mm

LB4096

50.0 mm

45.1 mm

5.7 mm

2.0 mm

48.0 mm

LB4330

75.0 mm

68.3 mm

4.4 mm

2.0 mm

73.5 mm

LB4941

100.0 mm

91.4 mm

3.8 mm

2.0 mm

98.7 mm

LB4913

125.0 mm

114.5 mm

3.4 mm

2.0 mm

123.8 mm

LB4265

150.0 mm

137.5 mm

3.2 mm

2.0 mm

148.9 mm

LB4282

200.0 mm

183.6 mm

2.9 mm

2.0 mm

199.0 mm

LB4837

250.0 mm

229.6 mm

2.7 mm

2.0 mm

249.1 mm

LB4545

300.0 mm

275.6 mm

2.6 mm

2.0 mm

299.1 m

LB4453

500.0 mm

459.7 mm

2.4 mm

2.0 mm

499.2 mm

LB4223

750.0 mm

689.8 mm

2.2 mm

2.0 mm

749.2 mm

LB4374

1000.0 mm

919.8 mm

2.2 mm

2.0 mm

999.3 mm

Item #

Diameter

Focal Length

Radius of Curvature

Center Thickness

Edge Thickness

Back Focal Length

Reference
Drawing

LB4592

60.0 mm

52.6 mm

15.6 mm

2.5 mm

54.4 mm

LB4553

75.0 mm

67.0 mm

12.5 mm

2.5 mm

70.6 mm

LB4821

100.0 mm

90.4 mm

10.3 mm

3.0 mm

96.4 mm

LB4140

150.0 mm

136.8 mm

7.8 mm

3.0 mm

147.3 mm

LB4842

200.0 mm

183.0 mm

6.5 mm

3.0 mm

197.7 mm

LB4972

250.0 mm

229.1 mm

5.8 mm

3.0 mm

248.0 mm

LB4710

300.0 mm

275.2 mm

5.4 mm

3.0 mm

298.2 mm

LB4910

500.0 mm

459.4 mm

4.4 mm

3.0 mm

498.5 mm

LB4293

1000.0 mm

919.6 mm

3.7 mm

3.0 mm

998.7 mm

View All »Matching Part Numbers

UV Fused Silica Bi-Convex Lenses, Uncoated

Features