As a relatively new piece of technology, the first laser was built in 1960, and they have since been developed into various configurations, shapes and sizes. Lasers emit precisely-controlled directed beams of light and are used in a range of industries, including astronomy, engineering, and healthcare, in applications that require a concentrated beam of light in a particular time, space or wavelength.

Advancements in science and technology have enabled researchers to measure the amount of energy per unit delivered by a laser beam, also known as laser power, and is usually measured in watts (W). Measuring laser power has two primary uses: to ensure the laser is utilizing the correct power level and, over time, to monitor the laser’s performance. Both reasons for measuring laser power ensure lasers are meeting industry requirements and processes can run smoothly. There are several methods for laser power measurement, including beam profilers, photodiodes and thermopile detectors, all of which we will discuss in more detail in this blog post.

How is Laser Power Measured?

The solutions you choose for measuring laser power must be accurate and reliable; otherwise, the data obtained may have a negative impact on your equipment maintenance and operations. In this section, we look at the different solutions and their key features and advantages.

Beam Profilers

A laser beam profiler is designed to measure the spatial distribution of the laser beam in relation to the beam propagation path. This method measures, displays and records the entire profile of a laser beam instead of the diameter alone, offering many benefits to its user.

Beam profilers have several uses. Not only are they used to measure laser intensity, but they are also used to accurately align laser beams, monitor performance over periods of time and to maintain a particular beam shape. These instruments are critical industries such as healthcare, manufacturing, and scientific research.

Photodiodes

Photodiodes are another popular measuring tool. They utilize semiconductor devices that measure a current emitted by the laser light, which is conducted by converting light into an electrical signal. Photodiodes are highly sensitive and offer quick measurements, with a response time of micro or milliseconds.

The other benefits of using photodiodes for measuring laser power are that their low noise and high sensitivity allow them to take low power measurements in low light levels. They can also be used to characterize the intensity profile of a laser beam.

Thermopile sensors

A thermopile detector is one of the traditional methods of measuring laser power. It converts heat from the laser beam into an electric signal, which passes through the detector. The key advantage of a thermopile detector is that it can measure laser power over a variety of wavelengths. Still, other benefits include high sensitivity, quick response time and ease of use.

Where Can I Buy Laser Power Measurement Solutions?

If you’re looking for a superior solution for laser power measurement, Dexter Research Center are sure to have the answer for you. We develop a wide range of infrared sensing and detect-and-manage solutions, including industry-leading thermopile detectors for various applications.

Our thin film-based thermopile detectors are designed for applications such as laser power measurements, as well as gas analysis, fire detection and non-contact temperature measurements. They offer high output and signal-to-noise ratio, outstanding sensitivity and have a large active area, providing accurate measurement of laser power and energy.

Contact a Dexter team member today to find the best solution for your laser power measurements.