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Pyroelectric Detectors

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LOGAN, Utah, Jan. 26, 2010 -- Ophir-Spiricon Inc. has announced the PE25BF-DIF and PE100BF-DIF, the newest members of its line of pyroelectric detectors for repetitive pulses. These energy sensors provide a high damage threshold, high pulse energies and a wide spectral range. The PE25BF-DIF has a fast broadband absorber that accurately measures from 193 nm to 2.2 µm at pulse rates to 150 Hz, and pulse energies are measured up to 10 J. The PE100BF-DIF measures from 193 nm to 2 µm at pulse rates to 40 Hz, and pulse energies are measured to 40 J.

Unlike most high-damage-threshold detectors that require multiple diffusers to cover the spectral range, these use a single, removable diffuser to cover the UV, visible, and mid-IR wavelengths. This results in an accurate and flexible system that handles a wide range of measurement requirements. The sensors work with most types of pulsed lasers, from short to long pulse, and from low to high energy.

The PE25BF-DIF is designed for medium-size pulsed lasers with high energy densities – including YAG, holmium and erbium lasers – that require high damage thresholds. It features a 25-mm aperture and a metallic coating, and it measures repetition rates to 150 Hz and pulse widths up to 5 ms. The detector's BF coating provides a high damage threshold for the UV, visible and mid-IR, ranging from 2 J/cm2 at <100 ns to 40 J/cm2 at 2 ms. For lower energy densities, the sensor is available without a diffuser. Calibration accuracy is ±3%, and surface reflectivity is ~20%.

The PE100BF-DIF pyroelectric detector is designed for very large pulsed lasers with high energy densities that require high damage thresholds. It features an 85-mm aperture and metallic coating, and it measures repetition rates to 40 Hz and pulse widths up to 10 ms. The detector's BF coating provides a high damage threshold for UV wavelengths – 3 J/cm2 at <10 ns.

The patented design combines accurate measurement of average power using a thermal head, with measurements of relative pulse energy using a photodiode that provides energy per pulse. Both models provide data about pulse energy, average power, frequency, minimum and maximum values, missing pulses, time jitter and standard deviation. Up to 50,000 points of data can be stored. The display of pulse energies can be either numerical or graphical, using one of the company’s smart displays or PC interfaces, including the Orion PE, Nova, Nova II, Vega, LaserStar, USB, Pulsar and Quasar. Each display features a "smart connector" interface that automatically configures and calibrates the display when plugged into one of the company's measurement heads.



Published: January 2010
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