"; _cf_contextpath=""; _cf_ajaxscriptsrc="/cfthorscripts/ajax"; _cf_jsonprefix='//'; _cf_websocket_port=8578; _cf_flash_policy_port=1244; _cf_clientid='1275C762B3C22BA3C7E40232E72D028E';/* ]]> */
Benchtop Voltage Controller for Liquid Crystal Devices
Constant Output Voltage
Modulated Output Voltage
LC Voltage Controller
Click to Enlarge
Back Panel of the LCC25 Liquid Crystal Controller
The LCC25 liquid crystal controller is compatible with many of our liquid crystal (LC) devices (see the table to the right). It produces a 2000 Hz square-wave AC voltage output with an amplitude that can be varied from 0 Vrms to ±25 Vrms. Nematic LC retarders must be driven with an AC voltage in order to prevent the separation and build up of charge, which can cause the device to burn out. In addition to the 2000 Hz AC drive voltage, the LCC25 controller automatically zeros the DC bias across the LC device to within 10 mV in order to counteract the buildup of charges.
Figure 2. A plot of the output voltage of the LCC25 Liquid Crystal Controller when the output voltage is being modulated between the two set voltages.
Figure 1. A plot of the output voltage of the LCC25 Liquid Crystal Controller when it is being operated in the constant voltage mode.
The AC output voltage amplitude can be set using the front panel controls, an external 0 - 5 VDC TTL input, or via the USB interface. Both the front panel and USB interface allow the user to select two voltage levels, Voltage 1 and Voltage 2. When the LCC25 is operated in the constant voltage mode, the output of the controller will be a 2000 Hz square wave with an amplitude equal to either of the two set voltage levels (Figure 1). Alternatively, in Modulation mode, the amplitude of the 2000 Hz square wave output will switch between Voltage 1 and Voltage 2 at a frequency that can be set internally (0.5 Hz to 150 Hz, see Figure 2) or triggered externally with 0 to 5 V TTL input (0.5 Hz to 500 Hz). The modulated mode can also be used to measure the response time of the LC retarder.
The USB interface can also be used to send line commands to the controller so that the LCC25 can be used in automated lab sequences. This enables operation through a terminal interface or control of the device using a written program.
Thorlabs also offers the KLC101 K-Cube™ Liquid Crystal Controller.
Click to Enlarge
Screenshot of the GUI interface in Modulation Mode
Software for the LCC25 Controller
Graphical User Interface
Custom Software Development