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Oriel Integrating Spheres

Oriel Integrating Spheres
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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 1295 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 Integrating Spheres Oriel Integrating Spheres Integrating spheres are ideal optical diffusers; they are used for radiometric measurements where uniform illumination or angular collection is essential, for reflectance and transmittance measurements, or even to mix two light sources. We offer five families of integrating spheres in sizes from 2 to 8 inches (51 to 203 mm), with three coating types to cover the following spectral ranges: • Barium Sulfate for 350 – 1300 nm • PTFE for 250 – 2500 nm • Diffuse Gold for 7.5 – 10 ìm How Do Integrating Spheres Work? Fig. 1 shows the principle of operation of integrating spheres. Light is collected by an integrating sphere and uniformly reflected and scattered around the sphere’s interior so the output is a uniform, spatially integrated field (Lambertian) of radiation which is insensitive to the spatial, angular and polarization changes of the input. Our integrating spheres come with 1.5 Inch Series input and output flanges so they can be mounted to any of our Oriel instruments and components. OUTPUT INPUT DIFFUSING BAFFLE Fig. 1 Principle of operation of an integrating sphere. The incoming beam is diffusely reflected inside an integrating sphere. The output port cannot “see” the region of first impact. Why an Integrating Sphere? For critical radiometric measurements, always use an integrating sphere; they are close to ideal diffusers. Integrating spheres are considerably more expensive, and suffer similar or higher throughput losses than disk diffusers, but they provide a true cosine response and very repeatable uniform illumination of a spectrometer grating or detector. Disk diffusers are suitable for applications requiring relatively uniform illumination, such as detectors which are not uniformly sensitive across the photosensitive area. High Reflectance Most of our integrating spheres are available with a choice of three interior materials. For VIS-NIR applications choose our barium sulfate-based white coated spheres. The coating is highly reflective, >97% in the visible. For UV, VIS or NIR measurements, we offer spheres with interiors machined from a unique PTFE thermoplastic material that is very rugged and highly reflective down to 250 nm. For applications in the NIR and IR regions our diffuse gold spheres provide near-lambertian characteristics and reflectance values up to 95%. All of our spheres are designed to provide high reflectance, stability and low throughput loss over their usable wavelength range. High Damage Threshold The excellent reflectance of our spheres gives them a high damage threshold. Measurements with a pulsed laser at 1.6 ìm showed the damage threshold of the coated spheres to be 1.5 W cm-2. The PTFE spheres have an even higher damage threshold of 8 W cm-2, and the gold spheres exhibit a damage threshold of 19 W cm-2. REFLECTANCE (%) THROUGHPUT (%) WAVELENGTH (nm) 100 0 90 80 70 60 50 40 30 20 10 250 500 750 1000 1250 1500 1750 2000 2250 2500 PTFE THROUGHPUT PTFE REFLECTANCE BaSO4 THROUGHPUT BaSO4 REFLECTANCE Fig. 2 Reflectance and throughput of 4 inch PTFE and BaSO4 Spheres. • Ideal diffusers; ensure reproducible radiometric measurements • Spatially insensitive collection of energy • Uniform radiance/irradiance fields for test of sensors • 2 to 8 inch sphere sizes • Coated with broadband, stable coatings: PTFE (250 – 2500 nm), BaSO4 (350 - 1300 nm), Gold (7.5 - 10 ìm)

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1296 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 REFLECTANCE (%) 90 100 98 96 94 92 WAVELENGTH (ìm) 5 7 9 10 GOLD 6 8 Fig. 3 Reflectance of Diffuse Gold Which Sphere Do I Choose? We offer five integrating sphere designs with a choice of interior coatings covering the UV-VIS through the IR. Your choice is often a tradeoff between throughput and uniformity needs. For...

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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 1297 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 A reflectance sample holder with 1 inch (25 mm) diameter, 0.5 inch (13 mm) deep cell holds the sample at 8° to the beam. The clear aperture is 0.7 inch (18 mm). The holder is spring loaded so that square, rectangular or irregular shapes with dimensions up to 2 inches (51 mm) can be held against the sphere wall. (The...

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1298 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 Fig 4 Dimensional diagram of Monochromator Integrating Spheres. 70669 PTFE 1/4-20 TAPPED MOUNTING HOLE 1.5 INCH SERIES MALE FLANGE 11 mm FERRULE ADAPTER PORT PLUG 4.45 (113) 4.45 (113) 4.45 (113) 2.80 (71.1) 4.23 (107.4) 6.23 (158.2) 70668 BARIUM SULFATE 70670 DIFFUSE GOLD 1.5 INCH SERIES MALE FLANGE 1/4-20 TAPPED...

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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 1299 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 70677 BARIUM SULFATE 70678 DIFFUSE GOLD 1.5 INCH SERIES MALE FLANGE LIGHT BAFFLE 2.0 INCH APERTURE WITH MOUNTING HOLES 1/4-20 TAPPED HOLE PORT PLUG 8.73 (222) 8.23 (209) 4.39 (111.5) Fig 7 Dimensional diagram of Uniform Sources Integrating Spheres. 70679 BARIUM SULFATE AND 70682PTFE R/T SPHERE IN “TOTAL...

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