The thermopile laser power meter is a typical device for pyroelectric optical power measurement, which uses the thermal effect of laser and the pyroelectric effect in metal. Pyroelectric sensors have the advantages of flat spectral response, relatively difficult to reach saturation, and less affected by illumination angle and position; the disadvantage is that the response speed is relatively slow.

01 Photodiode type Due to the low power of early lasers, measurement with a photoelectric laser power meter can meet the requirements of use. The photoelectric laser power meter is sensitive and fast, and it is the earliest power meter.

At present, the photodiodes used for optical power measurement are mainly PIN photodiodes. Compared with the traditional PN type, this structure increases the depletion layer in the middle of the PN junction, the junction capacitance is small, and the response speed is faster. The PIN tube made of InGaAs can be widely used in industry and scientific research because of its low noise and high responsivity.

Different from other optical power meter structures, the flowing water optical power meter adds a layer of water inside the light-absorbing material. As a liquid with a relatively large specific heat capacity, water can effectively take away the heat generated by the laser being absorbed by the material. After the water flows out of the heating area, the laser power can be calculated by the flow velocity of the water and the water temperature at the measurement point.

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03 Pyroelectric type Pyroelectric sensors are based on the pyroelectric effect of some crystals for sensing. Pyroelectric sensors are generally not suitable for measuring continuous laser light because they measure temperature changes. A power meter based on the pyroelectric effect is generally called a pyroelectric energy meter, which is suitable for measuring the energy of a single pulse.

With the development of measurement requirements, laser power meters based on various laser power measurement principles have also appeared one after another, including pyroelectric, photodiode, pyroelectric, flowing water, low-temperature absolute radiometers, and photoinduced lasers that have appeared in recent years. Kinetic sensing forms, etc. Several typical laser power measurement methods are as follows:

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The structure of the photodiode laser power meter is simple, because the thermal effect of light is not used, the requirement for the external environment temperature is relatively low, and the response speed is faster compared with the thermal effect power meter; the disadvantage is that it is more susceptible to electrical noise interference, and the spectral response is not enough flat.

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04 Low temperature absolute radiometer With the wide application of fiber optic technology, researchers have also begun to care about the measurement of tiny laser power, and pyroelectric laser power meters have emerged as the times require. In addition to the requirements for the power range, in terms of accuracy improvement, the research on absolute radiometers promoted the establishment of the measurement benchmarks of laser power meters, and the subsequent emergence of low-temperature absolute radiometers made the upper limit of the measurement accuracy of laser power meters significantly improved. promote.

Because the displacement of the mirror caused by the light-induced tiny force is very small, the researchers proposed several novel measurement system structures in order to measure this displacement; the measurement structure of the suspension mirror, the magnetic levitation structure, and the spring balance structure, etc.

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ELITE Customizes Laser Modules. In order to ensure the performance of lasers, we use authoritative Power Meters to measure the output power of lasers and use authoritative Beam Profilers to test beam quality. Share your ideas, we will provide the best laser solutions. To know more, please contact us at sale@s-laser.com or 86-29-68590616.

06 Photodynamic sensing With the continuous improvement of instrument measurement accuracy, photoinduced microforce has gradually become an important research direction of laser power measurement. In recent years, due to the emergence of high-precision displacement sensors such as high-precision interferometers and piezoelectric ceramic sensors, the research on radiation pressure effects is no longer limited to theoretical research, and the research on light-induced micro-forces has gradually moved towards the application field.

02 Thermopile type  With the development of laser technology, various lasers have come out one after another. From the initial solid-state lasers, to the gas lasers, liquid lasers, semiconductor lasers, and the latest free electron lasers, as the measured laser power continues to increase, the power measurement range exceeds the saturation of the photoelectric power meter threshold. Therefore, thermoelectric power meters that can measure greater power have emerged.

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05 Flow type With the further increase of the measured power, the thermoelectric power meter will produce temperature drift, and the rising temperature of the absorbing surface will also cause damage to the power meter. In order to increase the damage threshold of the power meter, various methods for high-power measurement have emerged. structure. The pipeline method is one of the power measurement methods for high-power lasers based on the thermal effect of the laser.

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In 2013, a method for measuring optical power based on photodynamics was proposed. The advantage of this method is that it can measure the laser power without absorbing the laser, monitor the laser power in real time, and according to the parameters of the mirror, it can realize the measurement of the laser power in a larger wavelength range and power range. Since the principle of photodynamics is the action of light in the reflection process and between the mirrors, compared with other methods introduced before, a great advantage of photodynamic sensing is that it can operate under the condition of almost no absorption of laser light. Realize the measurement of optical power, which provides an effective solution for online measurement in applications such as laser processing and measurement.

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