This DOI is data presented in the paper "A tuneable and switchable liquid crystal laser filter" - Ethan I. L. Jull & Helen F. Gleeson. 

The dispersion relation of birefringence for 5CB was modelled using the "Extended Cauchy model", the results of which can be found in the first data set. These theoretical results were later used to model the transmission spectrum of a Lyot filter for comparison with experimental data.

Images were taken of a green laser spot in the far field using a deltaPix camera. These images were taken when the liquid crystal Lyot filter was in protection mode and transmission mode (dataset 2). Thus demonstrating the ability for the Lyot filter to block laser light.

Images were also taken through the Lyot filter, focussed on an image, using a Nikon D7100 camera. The images were taken whilst in protection and transmission mode, demonstrating the ability for partial observations to be utilised when in protection mode (dataset 3).

The effect of an applied voltage on the birefringence of 5CB was theoretically calculated, the results of which can be found in dataset 4.

Transmission spectrums were measured using a spectrometer for the steady state, under high applied voltage (switching), and also over a range of voltages (tuning). The rejected wavelength could then be related to the applied voltage via the tuning data, allowing a direct relationship between the two.

Finally, switch speeds were measured using a photodiode. The intensity was measured as a function of time during an applied voltage switch. First a green laser diode was connected and the Lyot filter was switched between transmission and protection mode. Then a white light source was used and various voltage switch measurements were conducted, with each column of data corresponding to a specified switch.

For further information please send an email to py12ej@leeds.ac.uk