DC Short Arc Lamps
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Catalog excerpts

101 Email: sales@newport.com • Web: newport.com L i g h t S o u r c e s TECHNICAL REFERENCE CALIBRATION SOURCES DEUTERIUM SOURCES ARC SOURCES INCANDESCENT SOURCES MONOCHROMATOR AND FIBER ILLUMINATORS SOLAR SIMULATORS PHOTOLITHOGRAPHY INSTRUMENTS ACCESSORIES FOR ORIEL LIGHT SOURCES Oriel DC Short Arc Lamps Various DC arc lamps. Other than lasers, short arc lamps are the brightest manufactured sources of DC radiation. A large portion of their output is in the UV-VIS, which makes them useful for UV spectroscopy and UV photochemistry applications. Our DC xenon short arc lamps have a correlated color temperature close to that of the sun, ~5800 K. Our mercury arc lamps emit intense ultraviolet and visible radiation with very strong UV lines. Which Lamp Do I Choose? Your application determines which arc lamp is best. Ask yourself two questions: 1. What wavelength range do I require? This should identify whether you need a xenon or mercury lamp. Hg and Hg(Xe) lamps provide intense broad line output in the UV. If your need is for UV line irradiance, then these lamps are better. If you have a scanning application where you need to use a range of lamp wavelengths then a Xe lamp is better. It doesn’t have the large variations in output (i.e. large lines), and thus simplifies signal handling. Refer to the spectral irradiance curves, see page 62, also provided on our web site at www.newport.com. 2. How much power (irradiance) do I need? A high power lamp is best for irradiation of a large area (if the optical system imposes no limitation). For a target with small dimensions, relative to the arcs (i.e. fiber or monochromator slit), a small arc lamp may produce more irradiance because of its high radiance within a very small effective arc area. Look at both the total flux and the arc dimensions when your target is small. Narrow spectrograph slits require calculation involving F/#s of spectrograph, collection, and imaging system to ensure best results; see page 69 for a guide on sample power calculations. Types of Short Arc Lamps Xenon Short Arc Lamps* • Closely match the UV-VIS solar spectrum • Smooth continuum from UV-VIS The xenon lines dominate between 750 and 1000 nm, but the spectrum is almost featureless through the ultraviolet and visible. Xenon lamps are popular for demanding absorbance and fluorescence applications involving source spectral scanning, and as high intensity broadband sources. Because of its sun-like spectrum, the xenon lamp is used for solar simulation. * Some lower power Xenon lamps can be operated in a horizontal position. Mercury Arc Lamps • Strong UV output with discrete lines Mercury arc lamps contain an exactly measured amount of mercury and either argon gas or xenon, which acts as a starter gas, as the mercury vaporizes. When the lamps are cold, the gas pressure inside is lower than atmospheric and you can see small globules of mercury inside the lamp. When the lamps run, this mercury vaporizes and reaches pressures of up to 75 bar. So, these lamps pass from being a rare gas lamp to a mercury lamp. Mercury (Xenon) Lamps • Strong Hg lines in the UV and Xe lines in the IR Mercury(xenon) lamps have similar output spectra to mercury lamps, with some xenon lines in the infrared, and enhancement of the low level continuum in the visible. These lamps use xenon as the starter gas at above atmospheric pressure and operate with the anode at the top. High Stability Lamp We offer a 75 W Xenon High Stability Lamp, also commonly called a “Super-Quiet” Lamp. Most arc lamps suffer from “arc wander,” the gradual movement of the arc point over time, caused by a lack of electrons emitted from the cathode. This results in the need to re-adjust the lamp, over its lifetime. This lamp addresses the problem of the arc wander by using a highperformance cathode. The radiant intensity won’t drop off over the lamp’s lifetime.

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102 Phone: 1-800-222-6440 • Fax: 1-949-253-1680 L i g h t S o u r c e s TECHNICAL REFERENCE MONOCHROMATOR AND INCANDESCENT SOURCES ARC SOURCES DEUTERIUM SOURCES CALIBRATION SOURCES FIBER ILLUMINATORS PHOTOLITHOGRAPHY SOLAR SIMULATORS INSTRUMENTS ACCESSORIES FOR ORIEL LIGHT SOURCES EmArc™ Lamp Our 200 W EmArc™ Lamp is an enhanced metal arc lamp that combines the advantages of a xenon, a mercury, and a halide lamp, into a single source. It is similar to a metal halide lamp in luminous efficacy, but has a much longer life. The spectral output is similar to that of a mercury short arc lamp. The...

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DC Short Arc Lamps 3Pages

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DC Short Arc Lamps
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