Temperature-controlled pyroelectric detector for laser power measurement from nW to 0.5 mW.

Product family key features

Spectrally flat response

These radiometers were developed for NIST, to be used with a broadband spectrometer to act as a spectral transfer standard when calibrating other detectors in the 0.25 to 15 μm range.

Temperature Controlled Power Measurement

Each head is composed of a low noise detector, thermistor, TE cooler and heatsink to compensate for any temperature change

The Ultimate Choice in Measurement Stability

Temperature control down to 0.05°C from 20 to 30°C gives a temperature coefficient <0.01 %, thus a voltage output stable to 0.01 %

2 Sizes Available

  • TP5-BL: 5 mm Ø pyroelectric sensor with organic black coating
  • TP9-BL: 9 mm Ø pyroelectric sensor with organic black coating

To be used with the STEP-Controller

Plug your TP sensor into the STEP-Controller for power supply and temperature control. You can then use the analog output with a scope or lock-in 

Compatible stand

Compatible displays & PC interfaces

Related products

  • SDC-500 SDC-500

    Digital optical chopper.

  • TP9-BL TP9-BL

    Temperature-controlled pyroelectric detector for laser power measurement from nW to 0.5 mW.

Measurement capabilities

  • Maximum average power (continuous)

    500 μW
  • Noise equivalent power1

    5 nW
  • Spectral range2

    0.25 - 15 μm
  • Typical rise time

    0.2 s
  • Power calibration uncertainty

    ±2.5 %
  • Chopper frequency3

    10 Hz, 50% duty cycle
  • Temperature stability

    ± 0.05°C
  • Voltage response stability

    ± 0.01%
    • 1. With STEP-Controller and scope. Noise is < 11 nW RMS with STEP-controller and Lock-In.
    • 2. NIST-traceable calibration at 632.8 nm.
    • 3. SDC-500 digital optical chopper sold separately

Damage thresholds

  • Maximum average power density

    50 mW/cm²

Physical characteristics

  • Aperture diameter

    5 mm
  • Absorber

  • Dimensions

    50.8Ø X 48.3D mm
  • Weight

    0.227 kg

Measure low-power lasers at any wavelength with the BL absorber

The spectrally ultra-flat and broadband coating absorbs a very wide range of wavelengths. The very high absorptivity of our BL absorber guarantees a high sensitivity.

Customers enjoy:

  • Can be used with broadband light sources
  • Wide dynamic range
  • Very low noise

Compatible products you may need

Your item has been added to your cart!

You might need these specific products to be able to use the placeholder only.

Compatible products

No compatible product

Check if this product works for your laser

Measurement type:


Beam size


Laser type


Beam profile

COPYRIGHT ©2024 Gentec-eo Spektrum média