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Condition, New 390036-E4.00 mm0.566.50 mm5.00 mm3.05 mm2.5 µm3 – 5 µm∞BD-236_Asph.pdf–C036TME-E9.24 mm2.67 mmM9 x 0.5SPW301 FeaturesFocus or Collimate Light Without Introducing Spherical AberrationØ3.3 mm, Ø4.00 mm, Ø5.00 mm, or Ø7.60 mm Unmounted Clear ApertureAR Coated for 1.8 – 3 µm (-D), 3 – 5 µm (-E), or 8 – 12 µm (-F)Available Unmounted or Mounted in a Threaded, Engraved Stainless Steel HousingBD-2 and VIG06 Substrates Provide Stable Operation up to 130 °C and 110 °C Respectively Spherical aberration often prevents a spherical lens from achieving diffraction-limited design. The surfaces of an aspheric lens are designed to minimize spherical aberration, thereby providing a robust single element solution for many applications, such as collimating the output of a fiber or laser diode, coupling light into a fiber, spatial filtering, or imaging light onto a detector. In particular, our IR aspheric lenses are ideal for collimating light from mid-wavelength infrared (MWIR) and long-wavelength infrared (LWIR) sources, including Quantum Cascade Lasers (QCLs). All of the molded glass lenses featured on this page are available with an antireflection coating for either the 1.8 – 3 µm, 3 – 5 µm, or 8 – 12 µm range deposited on both sides. Other AR coating options are listed in the Aspheric Lens Selection Guide table at right. These molded glass lenses are available unmounted or premounted in stainless steel lens housings that are engraved with the part number for easy identification. These housings have a metric external threading that makes them easy to integrate into an optical setup or OEM application. For example, they are readily adapted to our SM1 (1.035″-40) Lens Tubes by using our Aspheric Lens Adapters. Mounted aspheres can also be used as a drop-in replacement for multi-element microscope objectives in conjunction with our RMS-threaded Objective Replacement Adapters. If an unmounted aspheric lens is being used to collimate the light from a point source or laser diode, the side with the greater radius of curvature should face the point source or laser diode. To collimate light using one of our mounted aspheric lenses, orient the housing so that the externally threaded end of the mount faces the source. Black Diamond Black Diamond-2 (BD-2), a chalcogenide made of an amorphous mixture of germanium (28%), antimony (12%), and selenium (60%), has several advantages over germanium, which is traditionally used to fabricate IR optics. BD-2’s thermally stable refractive index (see the Refractive Index tab) and low coefficient of thermal expansion (13.5 x 10-6 / °C) result in a smaller change in focal length as a function of temperature than for germanium. Additionally, germanium suffers from transmission loss as temperature increases, while BD-2 aspheric lenses can be used in environments up to 130 °C. This material performs particularly well over the 1.7 – 2.2 µm spectral range, providing >99% transmission and a flat dispersion curve. Click here to download a pdf of the SDS for BD-2. VIG06 VIG06 is a chalcogenide made of an amorphous mixture of arsenic (40%) and selenium (60%). VIG06 has similar optical properties to BD-2, but with a slightly higher refractive index and coefficient of thermal expansion (20.8 x 10-6 / °C) and a lower thermooptic coefficient (32.1 x 10-6 / °C). VIG06 aspheric lenses can be used in environments with temperatures up to 110 °C. Click here to download a pdf of the SDS for VIG06.

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