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Energy Sensors

The QE12LP-S-MB-QED-D0 is a pyroelectric detector designed for accurate laser energy measurement up to 3.9 J. It features a modular concept, allowing you to increase the power capability with two different cooling modules. The detector offers a low noise level of 0.7 µJ with the MB coating, ensuring precise measurements. The ...

Specifications

Max Measurable Energy: 3900 mJ
Max Repetition Rate: 300 Hz
Effective Aperture: 9 mm
Spectral Range: 0.3 – 2.1 um
Typical Rise Time: 550 µs
The Gentec-EO QE series is a robust line of high performance and high accuracy pyroelectric joulemeters that are designed to measure laser energy. Each modular unit is built for durability, compactness and ease of operation.  The QE optical absorber exhibits high damage thresholds and can operate at high ...

Specifications

Max Measurable Energy: 700 mJ
Max Repetition Rate: 6000 Hz
Effective Aperture: 12 mm
Spectral Range: 0.19 – 20 um
Elevate your laser energy measurements with the Gentec QE25LP-H-MB-D0 Pyroelectric Detector. Engineered for precision, this detector allows accurate measurement of laser energy up to 3.8 J. With traceable calibration, exceptional repeatability, and compatibility with various interfaces, it's an indispensable tool for applications in ...

Specifications

Max Measurable Energy: 3800 mJ
Max Repetition Rate: 300 Hz
Effective Aperture: 25 mm
Spectral Range: 0.19 – 20 um
Repeatability: <0.5 %
The Gentec-EO QE series is a robust line of high performance and high accuracy pyroelectric joulemeters that are designed to measure laser energy. Each modular unit is built for durability, compactness and ease of operation. The QE optical absorber exhibits high damage thresholds and can operate at high rep-rates. ...

Specifications

Max Measurable Energy: 3000 mJ
Max Repetition Rate: 6000 Hz
Effective Aperture: 25 mm
Spectral Range: 0.19 – 20 um
The Gentec-EO QE series is a robust line of high performance and high accuracy pyroelectric joulemeters that are designed to measure laser energy. Each modular unit is built for durability, compactness and ease of operation.  The QE optical absorber exhibits high damage thresholds and can operate at high ...

Specifications

Max Measurable Energy: 3800 mJ
Max Repetition Rate: 300 Hz
Effective Aperture: 25 mm
Spectral Range: 0.19 – 20 um
Enhance your laser energy measurement capabilities with the Gentec QE25LP-H-MB-QED-D0 Pyroelectric Detector. Designed for accuracy and reliability, this detector allows precise measurement of laser energy up to 23 J. With traceable calibration, high repeatability, and versatile compatibility, it caters to various applications in ...

Specifications

Max Measurable Energy: 23000 mJ
Max Repetition Rate: 300 Hz
Effective Aperture: 22 mm
Spectral Range: 0.3 – 2.1 um
Repeatability: <0.5 %
The PE3B-SI-D0 is a high-performance photodiode detector designed for laser energy measurement up to 24 pJ. With its impressive measurement capabilities and damage thresholds, this laser photodetector is an essential tool for precision laser energy measurement applications.

Specifications

Max Measurable Energy: 2.4E-8 mJ
Max Repetition Rate: 1000 Hz
Effective Aperture: 3 mm
Spectral Range: 0.21 – 1.08 um
Typical Rise Time: 15 µs
The PE3B-IN-D0 is an advanced photodiode detector designed for precision laser energy measurement, capable of measuring laser energy up to 245 pJ. With its exceptional measurement capabilities and NIST-traceable calibration, this laser photodiode is an essential tool for laser research and applications.

Specifications

Max Measurable Energy: 2.45E-7 mJ
Max Repetition Rate: 1000 Hz
Effective Aperture: 3 mm
Spectral Range: 0.9 – 1.7 um
Typical Rise Time: 12 µs
The UD10-2-H5-L is an uncalibrated thermal disk sensor designed for precise laser power measurement up to 2 W. With a broad spectral range of 0.19 - 20 μm, this sensor is ideal for a wide variety of applications that require accurate power measurement. The sensor features an exceptionally thin profile, starting at just 2 mm in ...

Specifications

Max Measurable Energy: 200 mJ
Max Repetition Rate: 10000 Hz
Effective Aperture: 10 mm
Spectral Range: 0.19 – 20 um
Maximum Average Power: 2 W
The QE12HR-S-MB-D0 is a precise pyroelectric laser energy detector designed for high-performance energy measurement applications, with a maximum energy capacity of up to 0.85 J. Featuring a modular concept, the detector can be equipped with two different cooling modules to increase its power handling capabilities. It offers ...

Specifications

Max Measurable Energy: 850 mJ
Max Repetition Rate: 1000 Hz
Effective Aperture: 12 mm
Spectral Range: 0.19 – 20 um
Typical Rise Time: 70 µs
The QE12HR-H-MB-QED-D0 is a high-performance pyroelectric detector designed to measure laser energy up to 3.9 J with exceptional accuracy. Ideal for high-energy laser applications, this detector is equipped with a modular concept that allows for increased power capability through the addition of two different cooling modules. With a ...

Specifications

Max Measurable Energy: 3900 mJ
Max Repetition Rate: 1000 Hz
Effective Aperture: 9 mm
Spectral Range: 0.3 – 2.1 um
Repeatability: <0.5%
The M6-6-PY is a high-performance integrating sphere detector designed to measure laser energy up to 2 mJ with exceptional accuracy. Capable of measuring pulse-to-pulse energy at frequencies of up to 200 kHz, this detector operates with no sampling, ensuring every pulse is captured in real time. It can store up to 4 million pulses, ...

Specifications

Max Measurable Energy: 2 mJ
Max Repetition Rate: 200000 Hz
Effective Aperture: 6 mm
Spectral Range: 0.35 – 2.5 um
Typical Rise Time: 150 ns
The M6-12.5-PY is an advanced integrating sphere detector designed for accurate laser energy measurements up to 20 mJ. Ideal for high-repetition rate applications, this detector can capture pulse-to-pulse data at frequencies up to 200 kHz without any sampling. It features a pyroelectric absorber that ensures precise energy readings ...

Specifications

Max Measurable Energy: 200 mJ
Max Repetition Rate: 200000 Hz
Effective Aperture: 12.5 mm
Spectral Range: 0.35 – 2.5 um
Maximum Measurable Energy: 20 mJ
Introducing the IS50A-1KW-RMT-D0, Gentec-EO's flagship high-power joulemeter, engineered to deliver unparalleled precision in laser energy measurement for industrial and research applications. With its robust design, NIST-traceable calibration, and innovative features, this high-power joulemeter sets a new standard in laser ...

Specifications

Max Measurable Energy: 1000 mJ
Max Repetition Rate: 1000 Hz
Effective Aperture: 50 mm
Spectral Range: 0.19 – 2.5 um
Noise Equivalent Energy: 1 mJ (Typical value)
Introducing the Gentec-EO QE195LP-S-MB Laser Energy Detector: Precision Measurement for High-Energy Applications Unlock unparalleled precision and reliability in laser energy measurement with the Gentec-EO QE195LP-S-MB. Designed to cater to the demanding requirements of high-energy laser applications, this detector stands out with ...

Specifications

Max Measurable Energy: 250000 mJ
Max Repetition Rate: 200 Hz
Effective Aperture: 195 mm
Spectral Range: 0.193 – 20 um
Noise Level: As low as 0.1 mJ
The PE5B-GE-D0 is a precision photodiode detector designed for laser energy measurement applications, capable of measuring laser energies of up to 2.4 nJ. This compact and high-performance energy detector operates in the spectral range of 800 to 1650 nm and offers exceptional sensitivity and accuracy. With fast response times and ...

Specifications

Max Measurable Energy: 2.4E-6 mJ
Max Repetition Rate: 1000 Hz
Effective Aperture: 5 mm
Spectral Range: 0.8 – 1.65 um
Typical Energy Sensitivity: 1 GV/J
Gentec-EO offers QE95 series energy detectors for pulse energy measurements of up to 250J in a wide spectral range with an attenuator and 70J - without attenuator. 

Specifications

Max Measurable Energy: 250000 mJ
Max Repetition Rate: 10 Hz
Effective Aperture: 95 mm
Spectral Range: 0.3 – 2.1 um
Gentec-EO offers QE95 series energy detectors for pulse energy measurements of up to 250J in a wide spectral range with an attenuator and 70J - without attenuator. 

Specifications

Max Measurable Energy: 70000 mJ
Max Repetition Rate: 10 Hz
Effective Aperture: 95 mm
Spectral Range: 0.19 – 20 um
Damage Threshold (Max Power): 40 W
Gentec-EO offers QE95 series energy detectors for pulse energy measurements of up to 250J in a wide spectral range with an attenuator and 70J - without attenuator. 

Specifications

Max Measurable Energy: 70000 mJ
Max Repetition Rate: 10 Hz
Effective Aperture: 95 mm
Spectral Range: 0.19 – 20 um
Gentec-EO offers QE95 series energy detectors for pulse energy measurements of up to 250J in a wide spectral range with an attenuator and 70J - without attenuator. 

Specifications

Max Measurable Energy: 250000 mJ
Max Repetition Rate: 40 Hz
Effective Aperture: 95 mm
Spectral Range: 0.3 – 2.1 um
Damage Threshold (Max Power): 90 W

Frequently Asked Questions

Energy sensors are high accuracy devices designed to measure different levels of laser energy.

There are two main types of energy sensors: Pyroelectric and Photodiode. Pyroelectric sensors operate by measuring repetitive pulse energies and average power, while photodiode sensors measure very low energy pulse lasers. Most energy sensors connect to a compatible computer or tablet PC using designated software.

Energy sensor devices can measure as little as very few nanojoules to numerous joules per pulse. Different units are able to measure different maximum/minimum levels of energy.

Common applications for energy sensors include laser energy measurements in any spectral range, laser optics, spectroscopy (measuring and interpreting the electromagnetic spectrum), and basic metrology (scientific study of measurement).

Important features to consider when selecting an Energy Sensor are aperture, noise level, power capability/average power, max repetition rate, max measurable energy, absorber type, and spectral range.

Energy sensor units are built for easy operation, compactness, and durability. They operate at extremely high repetition rates and exhibit high damage thresholds (limit to which an optic is damaged by a laser). Energy sensors also have high insensitivity to electromagnetic interference, an important element when operating in lab environments. Most devices are programmed with calibration sensitivity and spectral correction factors for varying wavelengths.

Why Energy Sensors Matter: Capturing the Pulse of Laser Systems

In the rapidly advancing world of photonics, lasers are being pushed to new limits—shorter pulses, higher energies, and more specialized applications than ever before. But with such power comes the need for precise control and measurement. This is where energy sensors step in.

Often overshadowed by their power-sensing counterparts, energy sensors play a critical role in the operation and maintenance of pulsed laser systems. These devices are essential for anyone who needs to know not just how much power a laser is emitting over time, but how much energy is delivered in a single pulse. Whether you're working in laser materials processing, medical technology, defense systems, or cutting-edge scientific research, accurate pulse energy measurement is key to performance, safety, and repeatability.

What Are Energy Sensors?

Energy sensors, also known as laser energy detectors, are specialized devices that measure the energy per pulse of a laser beam, typically expressed in joules. Unlike power sensors, which measure the rate of energy transfer (watts), energy sensors are designed to quantify the total energy delivered in each individual laser pulse.

This distinction is crucial for applications involving pulsed lasers, where peak power can be extremely high, even if the average power is relatively low. Understanding the energy per pulse helps optimize processes such as laser ablation, eye surgery, or LIDAR signal return—where precision and consistency are non-negotiable.

How Do Energy Sensors Work?

Most energy sensors operate using pyroelectric detectors or thermopile detectors:

  • Pyroelectric Sensors: These are ideal for short-pulse lasers. They work by detecting changes in temperature when a laser pulse strikes a sensor element, generating a temporary electrical signal proportional to the pulse energy.

  • Thermopile Sensors: More commonly used in high-energy applications, thermopiles absorb laser energy and convert the resulting temperature rise into an electrical voltage. They tend to be slower but are robust and can handle higher energy levels.

Both types are typically connected to an energy meter, which displays the pulse energy and may also provide analysis functions such as pulse averaging, statistics, and data logging.

Why Use Laser Energy Sensors?

There are many reasons why incorporating laser energy sensors into your system is a smart move:

  1. Process Optimization
    In industrial settings like laser welding or micromachining, having real-time pulse energy data enables better process control. You can fine-tune parameters to increase yield, reduce waste, and enhance repeatability.

  2. Safety Compliance
    In medical and defense applications, exceeding safe energy thresholds can cause serious harm. Energy sensors help ensure your system stays within regulated limits.

  3. System Diagnostics
    If your laser output starts drifting or behaving unpredictably, energy sensors are often the first line of diagnosis. They help spot inconsistencies early—before they lead to larger system failures.

  4. Quality Assurance
    In production environments, validating that each laser pulse meets spec ensures the final product meets strict quality standards. Energy sensors provide the traceability and reliability needed for regulated industries.

Key Features to Consider

When choosing an energy sensor, it’s important to match the product to your specific laser system and application. Key specifications to evaluate include:

  • Energy Range: What is the minimum and maximum pulse energy the sensor can accurately measure? Sensors are available for nanojoules up to hundreds of joules.

  • Wavelength Range: Ensure the sensor is calibrated for your laser’s wavelength. Many are broadband, but specific coatings improve accuracy and durability.

  • Repetition Rate: Some sensors can measure high rep-rate lasers (up to kHz), while others are better suited for low-frequency applications.

  • Aperture Size: Larger beam diameters require sensors with larger apertures to avoid clipping or damage.

  • Damage Threshold: Consider the sensor's damage threshold, especially with high-peak-power or ultrashort-pulse lasers.

Energy Sensors at FindLight

At FindLight, we offer a diverse selection of energy sensors from leading manufacturers in the photonics industry. Whether you're working with excimer, Nd:YAG, Ti:sapphire, or fiber lasers, you’ll find sensors that match your requirements in terms of energy range, spectral sensitivity, and form factor.

Need to measure pulse energies in a high-vibration environment? Looking for sensors with USB interfaces or wireless connectivity? Our catalog includes a variety of options to suit both laboratory and field settings.

Each product listing includes detailed specifications and datasheets to help you make an informed decision. And if you need assistance, our team is here to guide you in selecting the best energy sensor for your specific needs.

Conclusion

As lasers become more sophisticated, so too must the tools we use to measure them. Energy sensors are indispensable for pulsed laser applications, giving engineers, scientists, and technicians the insights they need to keep systems optimized and safe. Whether you're in research, manufacturing, or medicine, accurate pulse energy measurement is not a luxury—it’s a necessity.

Explore our full range of laser energy sensors on FindLight and discover the precision tools that power the future of photonics.

Did You know?

Laser energy meters, also known as energy sensors, are essential devices used in scientific and industrial applications to measure the output of lasers in a broad spectral range. These high-accuracy devices are designed to measure the optical energy output of lasers. Energy sensors, including pyroelectric and photodiode sensors, are commonly used for measuring the output of lasers in spectroscopy applications. Pyroelectric sensors measure repetitive pulse energies and average power, while photodiode sensors measure very low-energy pulse lasers. Laser energy meters play a critical role in general metrology, the scientific study of measurements and units, and it's important to choose the right sensor for your specific application based on factors such as power range, wavelength, and measurement requirements. FindLight offers a wide range of energy and power sensors, including pyroelectric detectors, to help you find the perfect sensor for your needs.