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Thermopile Laser Power Measuring Heads

Features

 The following range of laser power measuring heads is based on thermoelectric principles, where heat generated from incident radiation is transformed directly into a voltage.

Thermopile laser power detectors - BB and HP Series

Laser power detector for measuring very low laser powers - LP 20

VUV laser power detectors for use with F2 lasers - HP 30 - VUV - KF 40


BB and HP Series

 The BB series of heads has a black broadband absorbing coating. The HP series is equipped with a ceramic layer which allows for high energy and power densities.

 The HP25S head is specially designed for portable applications through the use of a smaller heat sink. This gives the head smaller dimensions but means that high powers are only possible for a short time.

 The heads need 15 to 20 seconds to reach a thermal equilibrium before a measurement can be made. To avoid this delay, we recommend the use of the LEM 2410 readout. This device monitors the rate of change of the voltage from the thermopile head and calculates the laser power from this data. Using the LEM 2410 reduces the time constant for the whole system down to 1 second.

Type

BB 25

BB 50

HP 25

HP 50

HP 25 S

HP 25/50

Active area, diameter (mm)

25

50

25

50

25

25

Max. power (W)

10

30

10

30

10

50

Max. power density (W/cm2

20

20

20

20

20

40

Diameter (mm)

120

150

120

150

90

120

Length (mm)

80

80

80

80

32

80

Sensitivity (mV/W)

70 to 150

Connector

BNC

Ordering Information

BB 25

 Laser power measuring head, 25mm diameter active area with broadband coating.

BB 50

 Laser power measuring head, 50mm diameter active area with broadband coating.

HP 25

 Laser power measuring head, 25mm diameter active area with ceramic layer for high energy applications.

HP 50

 Laser power measuring head, 50mm diameter active area with ceramic layer for high energy applications.

HP 25S

 Laser power measuring head, 25mm diameter active area with ceramic layer for high energy applications and small heatsink for portability.

HP 25/50

 Laser power measuring head, 25mm diameter active area with ceramic layer for up to 50W max power.

Useful Documents

pdf

BB and HP Power Head Series datasheet - pdf (104K)

LP 20 for Small Laser Powers

 This sensor is designed with a very high sensitivity in order to measure very low laser powers with high precision and resolution over the large dynamic range of six orders of magnitude.

 The sensor has a high linearity and no saturation effect at higher powers. The black absorption coating allows detection in a spectral range of 190 nm to 25 µm.

 To ensure the stability of the sensor, the housing has been thermally isolated. Additionally, the housing has a removable tube to protect the surface against stray light and air movement. This tube can be replaced by special adapters for use with optical fibres.

Type

LP 20

Active area, diameter (mm)

20

Sensitivity (V/W)

5

Tim constant (sec)

<2

Max. average power (W)

3

Detection threshold (µW)

10

Max. power density (W/cm2)

2.5

Diameter (mm)

45

Length (mm)

45 without tube

Connector

BNC

Ordering Information

LP 20

 Low laser power measuring head, 20mm diameter active area with broadband coating.

Useful Documents

pdf

LP 20 datasheet - pdf (67K)

HP 30 - VUV - KF 40

 Also available is a thermopile power measuring head for VUV (157nm) F2 laser measurements:

Type

HP30 - VUV - KF 40

Active area, diameter (mm)

30

Sensitivity (mV/W)

80 - 120

Max. average power (W)

30

Max. average power density (W/cm2)

20

Detection threshold (mW)

1

Diameter (mm)

100

Length (mm)

108

Electrical connector

BNC

Vacuum connector

KF 40 ND

Ordering Information

HP 30 - VUV - KF 40

 Laser power measuring head, 30mm diameter active area, specially for VUV.

Useful Documents

pdf

HP 30 - VUV - KF 40 datasheet - pdf (94K)

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