BK7 window

Short Description:

BK7 Glass is used for windows, lenses, and prisms where transmission in the range 0.4µm to 1.4µm is desired. the refractive index varies from about 1.53 to 1.5 through this range. it is used for thermally non-critical applications.


Product Detail

Product Tags

Description

BK7 window  has good performance over visible and near infrared wavelength region,is ideal for applications require minimal transmitted beam deviation. It is suitable for AR coating .

The wavelength of  SYCCO  general windows substrate(without coating)

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Specifications

Material: BK7 grade A optical glass
Bevel:  <0.25mm X 45°
Coating: Optional (Uncoated, AR, HR, PR, Coating, etc.)

  Standard High Precision
Dimension Tolerance +0.0/-0.1 +0.0/-0.02
Thickness Tolerance ±0.1 ±0.005
Surface quality: 60-40 10-5
Clear Aperture >85% >95%
Flatness(per 25mm@633nm) λ /2 λ /10
Parallelism 3 min 3 sec

Materials characteristic

B270

CaF2

Ge

MgF2

N-BK7

Sapphire

Si

UV Fused Silica

ZnSe

ZnS

Refractive index (nd)

1.523

1.434

4.003

1.413

1.517

1.768

3.422

1.458

2.403

2.631

Coefficient of dispersion (Vd)

58.5

95.1

N/A

106.2

64.2

72.2

N/A

67.7

N/A

N/A

Density(g/cm3)

2.55

3.18

5.33

3.18

2.46

3.97

2.33

2.20

5.27

5.27

TCE(μm/m℃)

8.2

18.85

6.1

13.7

7.1

5.3

2.55

0.55

7.1

7.6

Soften Temperature(℃)

533

800

936

1255

557

2000

1500

1000

250

1525

Knoop hardness

(kg/mm2)

542

158.3

780

415

610

2200

1150

500

120

120

We can supply you professional customized service

a: Dimesion size : 0.2-500mm , thickness >0.1mm
b: Many material could be choiced , include IR material like Ge, Si, Znse, fluoride and so on
c: AR coating or as your request
d: Product shape : round , rectangle or custom shape

Packaging & Delivery

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