Specifications

Features

Three Port Integrating Sphere for Diverging Beams

819D Series modular integrating sphere bodies feature three ports located at 0 and 90 degrees, as well as at the north pole. The baffle is located between the 0- and the 90-degree ports. Compared with Four Port 819C Series spheres, the 819D Series provides a better integration of the light input. We offer a wide variety of integrating sphere accessories that mount to the port frames, allowing the sphere to be customized for multiple applications.

Divergent Beam Integrating Sphere Applications

The 819D-IS series spheres are configured to be suitable for a divergent beam measurement.  A typical configuration has the source beam entering through the 0° port with a baffled detector mounted on the 90° port. Common applications include measuring power of divergent light sources such as laser diodes, lensed LEDs, lensed lamps and lensed fiber. For more details about these applications, please see our Integrating Sphere Fundamentals and Applications tutorial.
Divergent Light Source Power Measurement

Diffuse Gold Coating

The diffuse gold coatings on gold spheres exhibit superior reflectance characteristics in the long IR region when compared with coatings on existing barium sulfate and PTFE integrating spheres. The typical reflectance of gold is >94% up to 20 µm, while reflectance deteriorates rapidly after 2500 nm for both barium sulfate and PTFE. This makes gold spheres an ideal choice for mid- to far-IR applications.
Our integrating spheres are available with PTFE (spectralon), barium sulfate (spectraflect), and diffused gold sphere materials.

Diffuse Gold Spheres for IR Applications

Diffuse gold coating is an electrochemically plated, diffuse gold-metallic coating that exhibits high reflectance over the near-infrared and infrared wavelength range from 0.7 to 20 µm. Gold spheres and barium sulfate spheres are constructed in the same manner, except that the external flat surface and port frames on the gold spheres are also gold-plated. Gold spheres are ideal for infrared laser applications. Diffuse gold coatings remain stable at temperatures well above 100°C, while a barium sulfate coating may lose its reflectance at high temperatures. With a damage threshold four times greater than PTFE and high thermal limit characteristics, gold spheres are an excellent choice for high power applications.

Selecting an integrating sphere size

Among the factors in selecting the size of an integrating sphere is the physical limitation of the measurement setup that will be used. Generally, as the sphere diameter grows, the “integration” property of the sphere improves, the port size can be larger and higher input power can be accommodated. However, with the increasing attenuation of the setup, the throughput will be decreased.

Integrating Sphere Accessories

Newport offers accessories that are compatible with our integrating spheres to build a complete integrating sphere system. Various adapters are available to change port frame diameter, reduce an input port's clear aperture, measure fiber optic power, connect lens tubes and mount sensors. Port plugs to block an unused sphere port are also available.

Resources

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