{'fraction_non_alphanumeric': 0.016652059596844872, 'fraction_numerical': 0.0008764241893076249, 'mean_word_length': 5.106951871657754, '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}}
Pulsed CO2 laser-material interaction: mechanical coupling and reflected and scattered radiation

In general, high-intensity laser radiation causes heating, fusion and then vaporization of the target material. The vapor thus produced then interacts with incident radiation and becomes ionized, forming a more or less absorbant plasma which modifies the coupling with the material.
At the start of interaction and during it, however, a fraction of the incident energy is reflected and scattered by the target and the plasma.
The mass which is ejected with a high speed, and the expansion of the vapor, lead to the formation of a shock wave and mechanical impulse on the target.
The variety of laser characteristics and experimental conditions sometimes makes it difficult to compare the results of measurements. This difficulty is even greater when different types of measurement are brought together.
The second part of this article explains the results of measurements of mechanical and thermal coupling, as well as those of the energy reflected and scattered by the test sample and plasma, under the conditions presented in the first part.