UV Fused Silica Bi-Convex Lenses, Uncoated

Positive Focal Length for Use at Finite Conjugates
Zemax Files Available

LB4553

(Ø2")

LB4330

(Ø1")

LB4915

(Ø1/2")

LB4537

(Ø6 mm)

LB4743

(Ø5 mm)

Related Items

Other Bi-Convex Lenses

Self-Centering Lens Mounts

Small Lens Adapters

Translating Lens Mounts

UV Fused Silica:
Plano-Convex Lenses

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Overview
Graphs
Mounting Options
Feedback

Common Specifications^a
Lens Shape	Convex/Convex
Substrate Material	UV-Grade Fused Silica^a
Diameters Available	5 mm, 6 mm, 1/2", 1", or 2"
Diameter Tolerance	+0.0 mm / -0.1 mm
Thickness Tolerance	±0.1 mm
Clear Aperture	>90% of Diameter
Design Wavelength	588 nm
Index of Refraction	1.460 @ 588 nm
Surface Quality	40-20 Scratch-Dig
Spherical Surface Power^b	3λ/2
Spherical Surface Irregularity^b	λ/4
Centration	≤3 arcmin
Focal Length Tolerance	±1%

These lenses are also available with a variety of AR coatings. See the Bi-Convex Lens Selection Guide for all available options.
Where λ = 633 nm

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.

Bi-Convex Lens Selection Guide
N-BK7	Uncoated -A (350 - 700 nm) -AB (400 - 1100 nm) -B (650 - 1050 nm) -C (1050 - 1700 nm)
Mounted N-BK7	Uncoated -A (350 - 700 nm) -B (650 - 1050 nm) -C (1050 - 1700 nm)
UV Fused Silica	Uncoated -UV (245 - 400 nm) -A (350 - 700 nm) -AB (400 - 1100 nm) -B (650 - 1050 nm) -C (1050 - 1700 nm) -532 V-Coating (532 nm) -YAG (532 / 1064 nm) -1064 V-Coating (1064 nm) -1550 V-Coating (1550 nm)
CaF₂	Uncoated -E1 (2 - 5 µm)
ZnSe	-E3 (7 - 12 µm)

Custom coatings are also available. Please contact Tech Sales for a quote.

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 to Enlarge
Click Here for Raw Data

Click to Enlarge
CXY1A Translation Mount and
SM1 Lens Tube Mounted in a
30 mm Cage System

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	Mounts for Ø2 mm to Ø10 mm Optics
(Various)		Fixed Lens Mounts and Mini-Series 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	Mounts for Ø1/2" (Ø12.7 mm) Optics
LMR05	LMR05/M	Fixed Lens Mount for Ø1/2" Optics
MLH05	MLH05/M	Mini-Series 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	Mounts for Ø1" (Ø25.4 mm) Optics
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)
CXY1A		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 #		Mount for Ø1.5" Optics
Imperial	Metric	Mount for Ø1.5" Optics
LMR1.5	LMR1.5/M	Fixed Lens Mount for Ø1.5" Optics
(Various)		Ø1.5" Lens Tubes, Optional SM1.5RR Retaining Ring for Ø1.5" Lens Tubes and Mounts
Item #		Mounts for Ø2" (Ø50.8 mm) Optics
Imperial	Metric	Mounts for Ø2" (Ø50.8 mm) Optics
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	Adjustable Optic Mounts
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
SCL60CA	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:

Lei Zhou (posted 2023-06-01 15:43:48.583)

1. 有没有透镜两边的焦距不同？ 2. 如果我是光纤束（出光直径4.58mm），通过双凸透镜可以聚焦吗？需要推荐哪一款透镜？对焦距没有特殊要求。

cdolbashian (posted 2023-06-23 08:47:58.0)

Thank you for reaching out to us with this inquiry. To translate this to English and will reply in both languages: Chinese reply: Customer Feedback: 1. Are there lenses which have different focal lengths on both sides? 2. If I am [using] a fiber optic bundle (light output diameter 4.58mm), can it be focused through a biconvex lens? Which lens do you recommend? There are no special requirements for focal length. Thanks for contacting Thorlabs! Our aspheric lens pairs have different focal lengths on both sides. Ideally a symmetric biconvex lens with the optic placed at 2f would have a 1:1 relay to the next 2f position, but of course it would not be perfect due to typical optical aberrations. A Tech from China will contact you directly to discuss your application requirements. 感谢联系Thorlabs! 我司的非球面透镜对的两侧焦距不同。理想情况下，将物放在双凸透镜的两倍焦距处，在另一侧的两倍焦距处可以获得1:1的像，但受像差影响，实际效果不一定理想。来自中国的技术支持同事将直接联系您，进一步讨论您的应用需求。

Ø5 mm UV Fused Silica Bi-Convex Lens, Uncoated

Item #	Diameter	Focal Length^a	Diopter^b	Radius of Curvature	Center Thickness	Edge Thickness	Back Focal Length^a	Reference Drawing
LB4743	5.0 mm	10.0 mm	+100.0	8.8 mm	2.2 mm	1.5 mm	9.2 mm

Suggested Fixed Lens Mounts: LMR5(/M)

Focal lengths are listed at the design wavelength, 588 nm.
Reciprocal of the Focal Length in Meters

Ø6 mm UV Fused Silica Bi-Convex Lenses, Uncoated

Item #	Diameter	Focal Length^a	Diopter^b	Radius of Curvature	Center Thickness	Edge Thickness	Back Focal Length^a
LB4280	6.0 mm	10.0 mm	+100.0	8.8 mm	2.6 mm	1.5 mm	9.1 mm
LB4537	6.0 mm	15.0 mm	+66.6	13.4 mm	2.2 mm	1.5 mm	14.2 mm
LB4738	6.0 mm	20.0 mm	+50.0	18.1 mm	2.0 mm	1.5 mm	19.3 mm

Suggested Fixed Lens Mounts: LMR6(/M)

Focal lengths are listed at the design wavelength, 588 nm.
Reciprocal of the Focal Length in Meters

Ø1/2" (12.7 mm) UV Fused Silica Bi-Convex Lenses, Uncoated

Item #	Diameter	Focal Length^a	Diopter^b	Radius of Curvature	Center Thickness	Edge Thickness	Back Focal Length^a
LB4854	1/2"	20.0 mm	+50.0	17.7 mm	4.2 mm	1.8 mm	18.5 mm
LB4003	1/2"	30.0 mm	+33.3	27.1 mm	3.3 mm	1.8 mm	28.8 mm
LB4700	1/2"	40.0 mm	+25.0	36.3 mm	2.9 mm	1.8 mm	39.9 mm
LB4915	1/2"	50.0 mm	+20.0	45.6 mm	2.7 mm	1.8 mm	49.1 mm

Suggested Fixed Lens Mount: LMR05(/M)

Focal lengths are listed at the design wavelength, 588 nm.
Reciprocal of the Focal Length in Meters

Ø1" (25.4 mm) UV Fused Silica Bi-Convex Lenses, Uncoated

Item #	Diameter	Focal Length^a	Diopter^b	Radius of Curvature	Center Thickness	Edge Thickness	Back Focal Length^a
LB4879	1"	35.0 mm	+28.6	31.0 mm	7.4 mm	2.0 mm	32.4 mm
LB4030	1"	40.0 mm	+25.0	35.7 mm	6.7 mm	2.0 mm	37.6 mm
LB4096	1"	50.0 mm	+20.0	45.1 mm	5.7 mm	2.0 mm	48.0 mm
LB4330	1"	75.0 mm	+13.3	68.3 mm	4.4 mm	2.0 mm	73.5 mm
LB4941	1"	100.0 mm	+10.0	91.4 mm	3.8 mm	2.0 mm	98.7 mm
LB4913	1"	125.0 mm	+8.0	114.5 mm	3.4 mm	2.0 mm	123.8 mm
LB4265	1"	150.0 mm	+6.7	137.5 mm	3.2 mm	2.0 mm	148.9 mm
LB4282	1"	200.0 mm	+5.0	183.6 mm	2.9 mm	2.0 mm	199.0 mm
LB4837	1"	250.0 mm	+4.0	229.6 mm	2.7 mm	2.0 mm	249.1 mm
LB4545	1"	300.0 mm	+3.3	275.6 mm	2.6 mm	2.0 mm	299.1 mm
LB4453	1"	500.0 mm	+2.0	459.7 mm	2.4 mm	2.0 mm	499.2 mm
LB4223	1"	750.0 mm	+1.3	689.8 mm	2.2 mm	2.0 mm	749.2 mm
LB4374	1"	1000.0 mm	+1.0	919.8 mm	2.2 mm	2.0 mm	999.3 mm

Suggested Fixed Lens Mount: LMR1(/M)

Focal lengths are listed at the design wavelength, 588 nm.
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

LB4879 f = 35.0 mm, Ø1" UV Fused Silica Bi-Convex Lens, Uncoated

$152.05

Item #	Diameter	Focal Length^a	Diopter^b	Radius of Curvature	Center Thickness	Edge Thickness	Back Focal Length^a
LB4592	2"	60.0 mm	+16.7	52.6 mm	15.6 mm	2.5 mm	54.4 mm
LB4553	2"	75.0 mm	+13.3	67.0 mm	12.5 mm	2.5 mm	70.6 mm
LB4821	2"	100.0 mm	+10.0	90.4 mm	10.3 mm	3.0 mm	96.4 mm
LB4140	2"	150.0 mm	+6.7	136.8 mm	7.8 mm	3.0 mm	147.3 mm
LB4842	2"	200.0 mm	+5.0	183.0 mm	6.5 mm	3.0 mm	197.7 mm
LB4972	2"	250.0 mm	+4.0	229.1 mm	5.8 mm	3.0 mm	248.0 mm
LB4710	2"	300.0 mm	+3.3	275.2 mm	5.4 mm	3.0 mm	298.2 mm
LB4910	2"	500.0 mm	+2.0	459.4 mm	4.4 mm	3.0 mm	498.5 mm
LB4293	2"	1000.0 mm	+1.0	919.6 mm	3.7 mm	3.0 mm	998.7 mm