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Pellicle Beamsplitters

Pellicle Beamsplitters
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546 O p t i c s Phone: 1-800-222-6440 • Fax: 1-949-253-1680 WINDOWS BEAMSPLITTERS OPTICAL FILTERS POLARIZATION OPTICS DIFFRACTION GRATINGS HIGH-ENERGY OPTICS ULTRAFAST LASER OPTICS ACCESSORIES Pellicle Beamsplitters Order base (or post) separately Pellicle beamsplitters are ultra-thin, ultra-lightweight components that virtually eliminate multiple reflections commonly associated with glass beamsplitters. • Ultra-thin beamsplitter • Extremely lightweight • Uncoated for beam sampling • Coated for beamsplitting Specifications Material 5 ìm thick polymer film membrane, n=1.47 at 550 nm Wavelength Range 375–2400 nm Thickness Tolerance ±0.06 fringes/ mm Temperature Range -40 °C-70 °C Durability Hygroscopic film, keep from high humidity Cleaning Gently blow dust off only, do not touch or immerse membrane Damage Threshold Uncoated: 2 W/cm2 CW, 1 J/cm2 with 10 nsec pulses, typical Ordering Information Model Diameter (mm) Clear Aperture (mm) PBS-2 Uncoated 74.9 51.6 PBS-2C Coated 74.9 51.6 Vibration Effects The extreme thinness of pellicles provides many advantages in reducing losses and ghost images. However, the polymer membrane can resonate due to vibrations in the environment. Stiff posts or riser blocks should be used in mounting pellicles to an optical table (see page 705 and 723). Applications subject to air currents or acoustical noise should use glass beamsplitters. Interference Effects Interference effects due to thin membranes should be considered when using pellicles. Monochromatic interference between the front and back surfaces can introduce unwanted fringes into a transmitted or reflected beam. Secondly, pellicles act as low finesse interferometers. Over any wavelength range, a ±5% sinusoidal oscillation is superimposed on the transmission and reflection graphs. The oscillation values change very rapidly with wavelength and averages to the values are shown below. PBS-2 Uncoated 0.4 0.5 0.6 0.7 PBS-2C Coated 0.4 0.5 0.6 0.7 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 100 80 60 40 20 0 100 80 60 40 20 0 Transmission & Reflectance (%) Transmission & Reflectance (%) Transmission Reflectance Transmission Reflectance Typical Typical 12.7 M4 8-32 PS Series Pedestal Post System page 712 Slotted Bases page 723

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Pellicle Beamsplitters 1Pages

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Pellicle Beamsplitters
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