Power Sensors for Precise Optical Power Measurement

Photo Detector PH100-Si-HA

Photo Detector PH100-Si-HA

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Sold by: Gentec-EO Ships from: Canada
Specifications
Max Average Power: 0.04 W
Effective Aperture: 10 mm
Spectral Range: 0.35 – 1.08 um
Cooling Method: No cooling
Max Average Power (PH100-Si-HA): 36 mW / 750 mW
Power Detector PRONTO 250

Power Detector PRONTO 250

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Sold by: Gentec-EO Ships from: Canada
Specifications
Max Average Power: 250 W
Effective Aperture: 19 mm
Spectral Range: 0.248 – 2.5 um
Cooling Method: Convection, Thermoelectric, Heatsink, Fan-cooled
Single Shot Power (SSP): Up to 250 W

Did You Know?

Many laser power sensors are specified only for continuous-wave (CW) operation, but using them with short pulses can introduce 10–30% error because thermal detectors integrate energy over their thermal time constant rather than resolving instantaneous power. For example, a thermopile sensor with a 1 s response time exposed to 10 ns pulses at 1 kHz effectively measures average power (Pavg = Epulse × frep), completely masking peak powers that can exceed MW/cm² and damage coatings. Conversely, photodiode-based power sensors can respond on the ns–µs scale, but their calibration drifts with temperature and wavelength, so a ±3% spec at 633 nm may translate to >±10% error at 1550 nm if used outside the stated spectral range. Understanding these response-time and spectral-calibration limits is critical when choosing between thermal and photodiode power sensors for QC, alignment, or process monitoring tasks.
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Frequently Asked Questions

An optical power sensor measures the average optical power (typically in mW or W) of a continuous-wave (CW) or modulated beam, whereas an energy sensor measures the energy per pulse (in mJ or J) of pulsed sources. Power sensors usually rely on photodiode or thermal (thermopile, bolometer) detectors optimized for steady-state measurements, while energy sensors are designed with fast, integrating detection and specified damage thresholds for high-peak-power pulses.

Overview of Power Sensors

Power Sensors in the light detection domain are devices that convert incident optical radiation into an electrical signal proportional to optical power. On FindLight you will find Power Sensors optimized for continuous-wave (CW) and pulsed lasers, LEDs, and broadband sources across UV, visible, NIR, and IR spectral regions. These products are used in R&D labs, production test stations, field service, and calibration setups where reliable optical power readings are critical.

Typical Specifications and Architectures

Available Power Sensors span a wide range of detector technologies, including silicon photodiodes, InGaAs photodiodes, germanium diodes, thermopiles, and pyroelectric detectors. Key specifications include:

  • Wavelength range: from deep UV (~190 nm) to mid-IR (>10 µm), depending on sensor material and window.
  • Power range: from nanowatt and microwatt levels up to multi-hundred-watt or higher continuous power ratings.
  • Responsivity and sensitivity: specified in A/W or V/W, determining minimum detectable power and linearity.
  • Damage threshold: maximum CW or average power density (W/cm²) and maximum pulse energy density (J/cm²).
  • Aperture size and active area: from small-area photodiodes to large-area thermopile Power Sensors for expanded beams.
  • Accuracy and calibration: typical absolute accuracy in %, with NIST-traceable or equivalent calibrations.
  • Connectivity: analog outputs, USB, serial, or proprietary interfaces to display consoles and DAQ systems.

Use cases include laser alignment and setup, output stabilization, burn-in testing, laser safety verification, and characterization of fiber-coupled or free-space sources.

Buyer Guidance on FindLight

When selecting Power Sensors, first match the wavelength range and power range to your source, including any harmonic or broadband components. Check detector type for your application: photodiodes for low to medium powers and fast response, thermopiles for higher powers and wide spectral coverage, and pyroelectric sensors for pulsed sources. Evaluate aperture size versus beam diameter, and confirm damage threshold with suitable safety margin.

On FindLight, you can compare Power Sensors from multiple vendors side by side by reviewing datasheet parameters such as linearity, noise-equivalent power, rise time, and calibration uncertainty. Narrow your choices by connector type, cooling (passive or active), and mechanical form factor for integration into your setup. Once you identify suitable Power Sensors, request detailed quotes or technical clarification directly from suppliers—no registration is required to initiate contact.