Ophir has two types of energy sensors, pyroelectric and photodiode. Pyroelectric sensors are for measuring repetitive pulse energies and average powers at pulse rates up to 25000 pulses per second and pulse widths up to 20 ms. Photodiode energy sensors are for very low energy pulsed lasers, as low as 200 pJ. Note that single shot energy with pulse rates less than one pulse every 5 s or so can be measured with thermal sensors.
Pyroelectric sensors for measuring repetitively pulsed energy at up to 25 kHz. These sensors use a pyroelectric crystal that generates an electric charge proportional to the heat absorbed. The response time of the pyroelectric sensor depends on the time it takes for the heat to enter the crystal and heat it up. For metallic type pyro detectors, this time is tens of μs and thus the metallic type can run at a high repetition rate. For the BF and BB type, the response time is milliseconds with a correspondingly lower repetition rate.Show Products >