{'fraction_non_alphanumeric': 0.012077294685990338, 'fraction_numerical': 0.0, 'mean_word_length': 4.684931506849315, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Photographing by means of a diffractive axicon

In this paper we demonstrate that the light diffracted by a simple compact disc can be used to generate photographic images of a certain kind. Being the compact disc an axicon that generate a diffraction-free beam, we show that the focalization position of an image depends of the wavelength of the diffracted light, what makes possible its use as a spectral filter.