Cosine Correctors for SMA Connectorized Fibers

Features

Click to Enlarge
Figure 1.1  The cosine correction plot for each diffuser can be viewed by clicking on the info icons in Table 1.2.

• Small Diffuser Connects to SMA-Connectorized Fibers
• Reduces the Sensitivity of Measurements to Sampling Geometry
• Can be Used to Adapt our CMOS Spectrometers for Free-Space Applications

Thorlabs' Cosine Correctors are diffusers designed to couple light into or out of SMA-connectorized fiber optics. The correctors feature a diffuser in a tightly toleranced anodized aluminum housing. The input side of the CCSA2 is equipped with SM05 (0.535"-40) threads, while that of the CCSA1 is smooth.

The diffuser in a cosine corrector allows light to be collected from up to a 180° angle with the diffuser surface. This minimizes issues caused by sampling geometry inherent to other devices such as bare fiber optics or collimating lenses. As such, these diffuser packages are ideal for use in spectral measurements or as irradiance probes. An image of each cosine corrector connected to a spectrometer can be viewed by clicking on the photos in Table 1.2.

A plot showing the transmission spectrum of both diffusers is shown in Figure 1.3. The curve is normalized to the maximum measured transmission through that sample. Please note that the transmission is highly wavelength-dependent when selecting a cosine corrector for your application.

The cosine correction plot and transmission spectrum for each cosine corrector can be viewed by clicking on the blue info buttons () in Table 1.2.

Table 1.2  Specifications
Item #	CCSA1	CCSA2
(Click Photo for Details)
Cosine Correction and Transmission (Click for Details)
Diffuser Thickness	0.5 mm
Transmission @ 660 nma	0.2%
Clear Aperture	Ø4 mm
Housing at Input Aperture	Smooth Ø7.5 mm	Externally SM05 (0.535"-40) Threaded
Output Port	Accepts SMA Connectors
Suggested Mounting Adapters	AD8F	SM1A6T, AD12T

• Transmission was determined by comparing the integration time of the previous-generation CCS200 spectrometer with and without the cosine corrector installed.

Click to Enlarge
Figure 1.3  The transmission of the diffuser material used in the cosine correctors. Each curve is normalized to the maximum measured transmission through that sample.