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The Trigger Out connector outputs a TTL signal that has the same duration as the calibrated switching time of the filter. It can be used, for instance, to synchronize Kurios with a scientific camera, such that every time the camera captures an image, the filter is immediately advanced to the next wavelength in the sequence. Kurios triggers on the falling edge of the 5 V TTL signal. The Trigger In connector allows Kurios to be controlled by another device via a TTL signal. Each Kurios is factory calibrated and ships with a switching time map so that the user may optimize their system for the specific filter. In addition, the controller offers three BNC connectors (Trigger In, Trigger Out, and Analog In) that allow Kurios to be synchronized with a wide range of other devices, such as scientific cameras and motion control stages.
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The controller's front panel provides manual control of the center wavelength and enables programmable switching sequences, as described in the Control tab. Wavelength Control with Included Controller An LED on the filter head displays red when the head is warming up and green when it is ready to be used. For added operational stability, a closed-loop temperature control servo is used to maintain the filter head's operating temperature. Their integrated design enables quick and vibrationless tuning. Similar in construction to Lyot and Solc filters, Kurios filters consist primarily of liquid crystal cells that are sandwiched between polarizing elements. For a complete, Cerna-based Hyperspectral Imaging System, see the CM401, which includes a KURIOS-VB1 tunable filter and a CCD camera. This technique produces true spectral imaging and can thus show spectral features that would otherwise be impossible to detect. Thorlabs' Kurios tunable filters and CCD cameras are also compatible with our modular Cerna ® microscopy platform that supports customizable microscopy solutions. For example, they can be used in conjunction with a monochrome scientific CCD camera to obtain images with a much higher accuracy for color representation than using a color CCD camera with a Bayer mosaic. With an included controller that provides Trigger In, Trigger Out, and Analog In functionality, these tunable optical bandpass filters are ideal for applications that perform multispectral or hyperspectral imaging, as demonstrated in the image to the right. See the plots in the tables below for details. The switching time varies depending upon the initial and final wavelengths and on the Kurios' bandwidth setting (for -VB1 only).
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Alternatively, the KURIOS-VB1(/M) has user-selectable bandwidth settings of Narrow, Medium, and Wide. Kurios ® Liquid Crystal Tunable Bandpass Filters provide a continuously tunable center wavelength (CWL) in the 420 - 730 nm, 430 - 730 nm, or 650 - 1100 nm range. Most Kurios models have a fixed bandwidth for any given center wavelength.