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Biconcave Lenses > Fused Silica Biconcave Lens

Introduction

Biconcave lenses are manufactured with both surfaces concave. These lenses have negative focal lengths diverge collimated incident light and form virtual images which are seen through the lens. They are often used to expand light or increase focal lengths in existing systems.
 
 

Standard Specifications

  
 

Items

Specifications

Material

UV Grade Fused Silica or equivalent Optical Glass

Designed Wavelength

546.1 nm

Designed Index

1.46008±0.0005

Dimension Tolerance

+0.0/-0.2 mm

Thickness Tolerance

± 0.2 mm

Paraxial Focal Length

± 2%

Clear Aperture

> 90%

Centration

3 arc minutes

Flatness

λ/4 at 632.8 nm

Surface Quality

scratch and dig 60-40

Bevel

0.5 (0/-0.3) mm

 

Notes:

1. Material, besides fused silica, BK7 and any other materials are available.

2. Surface Quality could reach 40-20 or 20-10

3. Centration such as 1’, 30” is available.

4. Please show us the size and the coating specification.

  
   

 

230.36

Part NO.

f(mm)

ф (mm)

R(mm)

tc(mm)

te(mm)

fb(mm)

LBV1201

-15.0

12.7

14.11

2.0

5.0

-15.7

LBV1202

-20.0

12.7

18.71

2.0

4.2

-20.7

LBV1203

-25.0

12.7

23.32

2.0

3.7

-25.7

LBV1204

-30.0

12.7

27.92

2.0

3.5

-30.7

LBV1205

-40.0

12.7

37.12

2.0

3.1

-40.7

LBV1301

-25.0

25.4

23.32

2.0

9.5

-25.7

LBV1302

-35.0

25.4

32.52

2.0

7.2

-35.7

LBV1303

-50.0

25.4

46.32

2.0

5.6

-50.7

LBV1304

-75.0

25.4

69.33

2.0

4.3

-75.7

LBV1305

-100.0

25.4

92.33

2.0

3.8

-100.7

LBV1306

-150.0

25.4

138.34

2.0

3.2

-150.7

LBV1307

-200.0

25.4

184.35

2.0

2.9

-200.7

LBV1308

-250.0

25.4

2.0

2.7

-250.7

LBV1309

-300.0

25.4

276.36

2.0

2.6

-300.7

LBV1311

-500.0

25.4

460.40

2.0

2.4

-500.7

LBV1312

-1000.0

25.4

920.48

2.0

2.2

-1000.7

LBV1401

-50.0

38.0

46.48

3.0

11.1

-51.0

LBV1402

-100.0

38.0

92.49

3.0

6.9

-101.0

LBV1403

-150.0

38.0

138.50

3.0

5.6

-151.0

LBV1404

-200.0

38.0

184.50

3.0

5.0

-201.0

LBV1405

-350.0

38.0

322.53

3.0

4.1

-351.0

LBV1406

-500.0

38.0

460.55

3.0

3.8

-501.0

LBV1203

-25.0

12.7

23.32

2.0

3.7

-25.7

LBV1204

-30.0

12.7

27.92

2.0

3.5

-30.7

 

  

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