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Oriel Photomultiplier Tubes

Oriel Photomultiplier Tubes
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S p e c t r o s c o p y I n s t r u m e n t s 1233 Email: sales@newport.com • Web: newport.com MONOCHROMATORS AND SPECTROGRAPHS SINGLE CHANNEL DETECTION SYSTEMS MINISPECTROMETERS BENCHTOP SPECTROMETERS AND CCD CAMERAS FT-IR SPECTROMETERS ACCESSORIES FOR SPECTROSCOPY INSTRUMENTS Oriel Photomultiplier Tubes Photomultiplier Tubes in Side-on and End-on PMT Housings. Photomultiplier tubes (PMTs) have very low noise levels and are several orders of magnitude more sensitive than any other detector for UV and visible radiation. We offer PMT models with a full range of spectral sensitivities in both end-on and side-on versions, as well as PMT system components supporting DC, modulated and pulsed measurements. Pulse measurements from nanoseconds to milliseconds are possible at useful photocurrent levels of 100 ìA to 1 mA and above. Which Photomultiplier Tube do I Choose? With all the choices, it can become confusing deciding on the appropriate PMT for your measurement application. Below we describe the options. If you need further help, or want to validate your choice, please call a Sales Engineer for guidance. Side-on Photomultipliers These detectors are more economical than end-on models, have the fastest risetimes and are ideal for photometry and spectrophotometry applications. Their vertical configuration takes up less space than the end-on versions. They mount in the standard or pulsed housings. The main disadvantage of these tubes is their non-uniform sensitivity (refer to Fig. 3). However, the model 77360 Side-on PMT has a good uniformity of response, similar to the end-on tubes. End-on Photomultipliers These detectors have a large photocathode area, and greater uniformity. When mounted in the 70686 Pulsed or 77265 Standard Housings, they couple directly to our 1/8 m or 1/4 m monochromators without the need for a focusing lens. Pulsed or DC Operation All our PMTs can be used in a pulsed mode or DC. The housing determines the operation. Typical risetimes and electron transit times (the delay due to the finite time needed for electrons to transverse the multiplier chain) for all PMTs are listed in the specification table. These times are a function of bias voltage and/or the voltage divider network. They get shorter at higher bias voltages. You need to balance the desire for fast response with the increased noise levels at high biases. Which Housing Do I Choose? We offer two types of housings for both end-on and side-on PMTs. PMT Housings for Low Noise DC Operation For lowest noise DC operation, use the 70680 Housing for sideon tubes or the 77265 Housing for end-on models. These housings are also the best for short pulse measurements (up to 10 ìs long). You can obtain 1 mA level outputs from most of the tubes, in response to short pulses, which will provide easily measurable 50 mV readings when 50 ohm terminations are used. PMT Housings for Long Pulse Operation The 70685 and 70686 Housings allow you to obtain 100 ìA level pulse responses which can also be converted to 50 mV or higher readings with larger load resistors, the nanosecond response times not being critical for longer pulses. These housings also function well in DC applications. • Ultimate low light level detectors • DC or modulated light detection • High responsivity pulsed event detection from ms down to ns • 160 nm to 1100 nm models 77340 77341 77348 77345 77360 RESPONSIVITY (A/W) WAVELENGTH (nm) 200 300 400 500 600 700 800 900 105 104 103 102 Fig. 1 Typical Responsivity of Photomultiplier Tubes at the Bias Supply Voltages listed in the Ordering Information Table. 104 103 RESPONSIVITY (A/W) 102 101 200 400 600 800 1000 WAVELENGTH (nm) 77346 77361 77343 Fig. 2 Typical Responsivity of Photomultiplier Tubes at the Bias Supply Voltages listed in the Ordering Information Table. Models 77343 and 77361 come with a borosilicate glass window which limits their usefulness below 400 nm.

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1234 Phone: 1-800-222-6440 • Fax: 1-949-253-1680 S p e c t r o s c o p y I n s t r u m e n t s MONOCHROMATORS AND SPECTROGRAPHS BENCHTOP SPECTROMETERS MINISPECTROMETERS SINGLE CHANNEL DETECTION SYSTEMS AND CCD CAMERAS ACCESSORIES FOR FT-IR SPECTROMETERS SPECTROSCOPY INSTRUMENTS 12 0 12 0.0 0.5 1.0 RELATIVE SENSITIVITY (VERTICAL) DISTANCE FROM CENTER (mm) 4 0 4 0.0 0.5 1.0 RELATIVE SENSITIVITY (HORIZONTAL) DISTANCE FROM CENTER (mm) SIDE-ON HORIZONTAL SCAN SIDE-ON VERTICAL SCAN Fig. 3 Uniformity of Response for Side-on and End-on PMTs. END-ON HOUSING 1.4 (36) 1/4-20 TAPPED HOLE 1/4-20 TAPPED...

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Oriel Photomultiplier Tubes 2Pages

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Oriel Photomultiplier Tubes
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