Integrating spheres are designed to provide precise optical power measurements independent of beam shape, entrance angle, and polarization. These photodiode sensors have a faster response time than thermal sensor heads while also offering a high damage threshold. These integrating spheres feature enhanced shielding to avoid electromagnetic interference and an over-temperature alert sensor to warn against damage and measurement errors due to overheating of the sensor.
Our integrating spheres are designed for wavelength ranges from the visible through the NIR. Sensor heads for use between 350 and 2500 nm use a single Ø1" or Ø2" sphere made from Zenith® PTFE and feature a black housing to minimize reflected light around the entrance aperture. These sensors use either a silicon photodiode for detection in the 350 - 1100 nm range or an InGaAs photodiode for detection in the 800 - 1700 nm, 900 - 1650 nm, or 1200 - 2500 nm wavelength range.
The S180C integrating sphere for 2.9 - 5.5 µm uses two connected, gold-plated Ø20 mm spheres, with an entrance port in the first sphere and a port for the MCT (HgCdTe) detector located in the second sphere. Compared to single-sphere designs, the two-sphere configuration improves device sensitivity by minimizing the internal sphere surface area while still effectively shielding the detector from direct illumination. This design reduces the effect of input angle, divergence, and beam shape on the measurement result by effectively shielding the photodiode without the use of a baffle or other shielding mechanism.
Each integrating sphere includes an adapter with external SM1 (1.035"-40) threads as well as an S120-FC fiber adapter for compatibility with FC/PC- and FC/APC-terminated patch cables, supporting easy integration with both free-space and fiber-coupled setups. Additional fiber adapters for other connector types are available separately below. The externally SM1-threaded adapter can be removed using a size 1 screwdriver to place components closer to the window. The integrating sphere housing has 8-32 and M4 taps that can be used to mount the sensor on a standard Ø1/2" post (not included).

Specification

Detector Type : Silicon Photodiode
Wavelength Range : 350 nm - 1100 nm
Optical Power Range : 1 µW - 5 W
Max Average Power Density : 2 kW/cm²
Max Pulse Energy Density : 7 J/cm²
Resolution : 1 nW
Laser Types : Diode, He-Cd, ArIo, KrIo,
Dye, Ti-Sapphire, LEDs
Integrating Sphere Material (Size) : Zenith® PTFE (Ø2")
Housing Dimensions : 70.0 mm x 74.0 mm x70.0 mm(2.76" x 2.91" x 2.76")
Active Sensor Area : 3.6 mm x 3.6 mm
Sensor Aperture : Ø12 mm
Weight : 0.6 kg
Post Mounting : 8-32 and M4 Taps