{'fraction_non_alphanumeric': 0.04568527918781726, 'fraction_numerical': 0.03553299492385787, 'mean_word_length': 4.584905660377358, '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}}
Picosecond pulse generation from a Yb:CaF2–YF3 mode-locked laser

We experimentally investigated a picosecond (ps) diode-pumped passively mode-locked (ML) laser operation of a 5 at.% Yb, 5 at.% Y:CaF2 crystal obtained by the vertical Bridgman method. Without extra negative dispersion elements, the ML laser emitted stable 1.3 ps pulses at a repetition rate of 60 MHz with 514 mW average output power under the absorbed pump power of 6.43 W. The continuous wave (CW) operation was also reported with the average output power of 1.48 W, corresponding to the optical slope efficiency of 31.3%.