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MICRO-CONTROLE / Spectra-Physics
PbS and PbSe Detectors for Oriel Merlin™ Radiometry System

PbS and PbSe Detectors for Oriel Merlin™ Radiometry System

Product catalog summary

Overview: The document provides detailed information on PbS and PbSe detectors used in the Oriel Merlin™ Radiometry System, highlighting their specifications, performance, and ordering information.

Detector Specifications: PbS and PbSe are photoconductive infrared detectors. PbS offers high detectivity, while PbSe extends responsivity further into the infrared spectrum. Both types are optimized for AC operation due to 1/f noise from bias current.

Performance Characteristics: The Noise Equivalent Power (NEP) values and relative responsivities are illustrated in figures, showing performance across different wavelengths and temperatures. TE cooled detectors provide stable responses, while room temperature units may drift with ambient changes.

Stability and Responsivity: TE cooled detectors offer good stability. Both detector types may experience changes in responsivity when exposed to blue or UV light, requiring dark storage for recovery. A bias voltage of 100 V is integrated into the detector housings.

Measurable Power and Responsivity: The NEP plot indicates the minimum measurable power levels. A single point responsivity at 2.5 µm is provided for all detectors, with guidance for room temperature units and typical responsivity curves for other wavelengths.

Detector Systems: Each PbS and PbSe detector package includes a detector element, housing with built-in bias supply and preamplifier, and necessary cables. Additional components required include a cooler controller, Merlin™ Control Unit, and chopper.

Ordering Information: The document lists models with specifications such as detector type, wavelength range, active area, and temperature. Models include 70341 and 70343 for PbS, and 70344 and 70345 for PbSe, with options for TE cooled and room temperature models.

Catalog excerpts

PbS and PbSe Detectors for Oriel Merlin™ Radiometry System -1

S p e c t r o s c o p y I n s t r u m e n t s 1229 Email: [email protected] • Web: newport.com MONOCHROMATORS AND SPECTROGRAPHS SINGLE CHANNEL DETECTION SYSTEMS MINISPECTROMETERS BENCHTOP SPECTROMETERS AND CCD CAMERAS FT-IR SPECTROMETERS ACCESSORIES FOR SPECTROSCOPY INSTRUMENTS PbS and PbSe Detectors for Oriel Merlin™ Radiometry System PbS and PbSe Detectors These are classical photoconductive infrared detectors. PbS has a relatively high detectivity; PbSe extends the responsivity farther into the infrared. As with all infrared detectors, they benefit significantly from operating at lower temperatures. PbS and PbSe detectors are subject to 1/f noise due to bias current. We offer them for AC operation only. PbS @ 289K PbSe @ 298K PbSe @ 243K PbS @ 243K NOISE EQUIVALENT POWER (W Hz )-1/2 10-9 10-10 10-11 10-12 1000 2000 3000 4000 5000 6000 Fig. 1 NEP values of PbS and PbSe detectors. RELATIVE RESPONSIVITY WAVELENGTH (ìm) 70343 70341 70344 70345 1.0 0.8 0.6 0.4 0.2 0.0 1.0 2.0 3.0 4.0 5.0 6.0 Fig. 2 Relative responsivities of PbS and PbSe detectors. Stability Good stability of response is obtained with the TE cooled and stabilized detectors. Room temperature units show the usual drift with changing ambient conditions. Both PbS and PbSe are subject to a change of responsivity when exposed to blue to UV light. They usually recover but it may take days of dark storage before full recovery occurs. These detectors require a bias voltage; a 100 V bias supply is built into the detector housings. Measurable Power The NEP plot (Fig. 1) shows the typical minimum measurable power levels of our PbS and PbSe detectors. You will need an attenuator to measure power levels above approximately 0.1 mW. Single Point Responsivity We provide a single point responsivity, at 2.5 ìm, for all of our lead salt detectors. Use these factors with confidence for the cooled detectors; use them for guidance with the room temperature units. Use the typical responsivity curves (Fig. 2) to approximate responsivity at other wavelengths. Detector Systems All PbS and PbSe detector packages for Merlin™ include: • Detector element • Detector housing with built-in bias supply and preamplifier • All necessary interconnecting cables You will also need to order: • 77055 Cooler Controller for the cooled systems (described on page 1242) • Merlin™ Control Unit • Chopper • Excellent detectors for the NIR • Room temperature and TE cooled models Ordering Information Model Detector Type Wavelength Range Detector Active area Temperature 70341 PbS 0.7 to 3 microns 1 x 3 mm TE Cooled 70343 PbS 0.7 to 3 microns 3 x 3 mm Room Temperature 70344 PbSe 1 to 5 microns 1 x 3 mm TE Cooled 70345 PbSe 1 to 5 microns 3 x 3 mm Room Temperature

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