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Ophir-Spiricon has introduced the PE25BF-DIF and the PE100BF-DIF, the latest members of the company’s line of pyroelectric detectors for repetitive pulses.

These energy sensors provide a high damage threshold, high pulse energies and a wide spectral range, according to the company.

The PE25BF-DIF has a fast broadband absorber that accurately measures from 193nm to 2.2um at pulse rates to 150Hz; pulse energies are measured up to 10J.

The PE100BF-DIF measures from 193nm to 2.0um at pulse rates to 40Hz; pulse energies are measured to 40J.

While most high-damage-threshold detectors require multiple diffusers to cover the spectral range, the PE25BF-DIF and the PE100BF-DIF use a single, removable diffuser to cover ultraviolet (UV), visible and mid-infrared wavelengths.

The sensors work with most types of pulsed lasers, from short to long pulse and from low to high energy.

The PE25BF-DIF pyroelectric detector 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 25mm aperture and a metallic coating that measures repetition rates to 150Hz.

The sensor measures pulse widths of up to 5ms.

The detector’s BF coating provides a high damage threshold for UV wavelengths and ranges from 2J/cm2 at less than 100ns to 40J/cm2 at 2ms.

For lower energy densities, the PE25BF sensor is available without a diffuser.

The PE100BF-DIF pyroelectric detector is designed for very large pulsed lasers with high energy densities that require high damage thresholds.

It features an 85mm aperture and a metallic coating that measures repetition rates to 40Hz.

The sensor measures pulse widths of up to 10ms.

The detector’s BF coating provides a high damage threshold for UV wavelengths – 3J/cm2 at less than 10ns.

Ephraim Greenfield, vice-president of engineering for the Laser Measurement Group of Ophir-Spiricon, said: ‘The PE line of energy sensors was created for repetitive pulse lasers with high energies and high energy densities.

‘The patented design combines the highly accurate measurement of average power using a thermal head with measurements of relative pulse energy using a photodiode that provides energy per pulse.

‘The combination allows the sensors to measure powers and energies only a thermal head would be able to measure but for repetitive pulses at repetition rates never before seen,’ added Greenfield.

Both the PE25BF-DIF and the PE100BF-DIF 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 Ophir’s smart displays or PC interfaces, including the Orion PE, Nova, Nova II, Vega, Laserstar, USBI, 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.

Ophir-Spiricon

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