Polarimetry data, Images, Octave code, and other data from article: Imaging polarimeter with high-accuracy measuring principles in crystal optics
Description
This data is a supplement to the article "Imaging polarimeter with high-accuracy measuring principles in crystal optics". The abstract is reproduced below. The methods to produce this data are fully described in the associated manuscript. An imaging polarimeter based on the principles of high-accuracy polarimetry well known in crystal optics is proposed. The application of scientific digital cameras for performance light measurements leads to precise data on polarizers quality, i.e., maps of extinction ratio and transmission axis. Processing of numerous images, acquired at various settings in the polarizer-sample-analyser system, allows to determine the two-dimensional distribution of the phase retardation of birefringent plates. Several results of imaging polarimetry experiments on birefringent plates demonstrate the impact of multiple light reflections on the measured phase retardation values. Experimental data for LiNbO3 and SiO2 crystal plates have been presented, demonstrating the capabilities of the proposed type of imaging polarimeter in the crystal optics studies. This technique also allows the measurement of the eigen wave ellipticities, associated with the optical activity of crystals.
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Steps to reproduce
To obtain a full map of the extinction ratio 2𝜂, 13 images (folder IMG_PA_16bit) were achieved by changing the analyzer position approximately from 𝛼 = −2.0 to +2.0 deg and with the polarizer standing still. To get a 2D phase retardation distribution the images obtained on the polarimeter at different relative positions of the polarizers are processed. Optimally, it was 81 images, i.e., 9 positions for the polarizer and the analyzer, respectively. The main procedure in further image processing is to find the minimum of light intensity for each pixel of the sample image in the PSA system while rotating the analyzer and keeping the polarizer still.
Institutions
- Uniwersytet Kardinala Stefana Wyszynskiego