{'fraction_non_alphanumeric': 0.020463847203274217, 'fraction_numerical': 0.002728512960436562, 'mean_word_length': 5.116666666666666, '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}}
Characteristics of a free-electron laser oscillator with optical hole-coupling

We have analyzed the characteristics of a free-electron laser (FEL) oscillator with optical holecoupling. The effects of the hole-coupling on the amplitude, the acceptable misalignment error, the normalized FEL amplitude with offset misalignment, and the tilt tolerance of the misalignment were studied using a 3D FEL code that we developed. The variation in the radiation amplitude with the mirror tilting of the hole-coupling mirror and the variation in the radiation amplitudes on the spot sizes with the pass number were also calculated using a 3D code. The mode construction was simulated and studied for higher-order modes with and without errors.