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- Compensated Attenuators
Compensated Attenuators
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Compensated Attenuators
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Catalog excerpts
503 Email: [email protected] • Web: newport.com O p t i c s TECHNICAL REFERENCE AND FUNDAMENTAL APPLICATIONS LENS SELECTION GUIDE SPHERICAL LENSES CYLINDRICAL AND SPECIALTY LENSES OPTICS SETS OPTICAL SYSTEMS MIRRORS PRISMS Compensated Attenuators • Uniform attenuation across aperture • Compensated dual-wedge design • Wide dynamic range • High resolution • No multiple reflection fringes Our compensated attenuator provides high resolution intensity control without introducing a gradient in the intensity distribution or a change in the beam propagation direction. The optical density can be varied from 0.16 to 3.0 through a topmounted adjustment knob. Specifications Aperture Diameter 12.7 mm Attenuation Range 0.16–3.0 optical density Reflected Beam Deviation <20 arc sec (typical) Wavelength Range 440–690 nm optimal 400–1500 nm with reduced maximum transmission Damage Threshold 75 W/cm2 CW, 10 mJ/cm2 with 10 nsec pulses at 1064 nm, typical; not recommended for high energy pulsed laser use 203.2 C TYP B 12.7 2 HOLES, 12.7 THD A 101.6 63.5 25.4 3 HOLES, THD A B TYP 101.6 12.7 60 70 80 90 76.2 44.5 12.7 25.4 THD A, EACH END 80 90 0 10 ø Thread Dimension (mm) Model (Metric) A B C 925B (M-925B) 1/4-20 (M6) 50.8 (50.0) 76.2 (76.6) Ordering Information Model (Metric) Description 925B (M-925B) Compensated Attenuator Attenuation is achieved by moving two matched BK 7 wedged filters in opposing directions. The filters have a linear-variable aluminum neutral density coating and a broadband antireflection coating (Model 31W00MP-ML.1, see page 569). The slight wedge in the filters displaces any secondary reflections offaxis. The filters are matched for minimal beam deviation.
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