{'fraction_non_alphanumeric': 0.03644646924829157, 'fraction_numerical': 0.03416856492027335, 'mean_word_length': 4.641025641025641, '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}}
Sum-Frequency Generation in a Polarization-Preserving Optical Fiber

Efficient sum-frequency generation in a polarization-preserving fiber has been successfully attained by using a 1.064 µm Q-switched and mode-locked Nd: YAG laser. The visible wavelengths due to the sum-frequency mixing are 536 nm and 564 nm, where the conversion efficiency from the pump to those visible lines reached 0.5–1% with a mode-locked peak pump power of 20 kW.