Jiarui Wu, Zhiqiang Lü, Xing Lu, Guanyu Liu, Kebin Shi. Characteristics of Second Harmonic Generation in Erbium Doped Femtosecond Fiber Lasers Based on Quasi Phase Matching[J]. Chinese Journal of Lasers, 2018, 45(7): 0701001
- Chinese Journal of Lasers
- Vol. 45, Issue 7, 0701001 (2018)
Fig. 1. Schematic of the experimental device
Fig. 2. (a) Optical spectrum and (b) autocorrelation image of erbium doped pulse oscillators
Fig. 3. (a) Optical spectrum of amplified pulse after compression; (b) autocorrelation image of amplified pulse before compression; (c) beam quality M2 curve; (d) autocorrelation image after compression
Fig. 4. Autocorrelation images of PPLN crystals with different thicknesses. (a) 0.5 mm un-chirped PPLN crystal; (b) 1 mm un-chirped PPLN crystal; (c) 10 mm chirped PPLN crystal
Fig. 5. SHG optical spectra of PPLNs with different thicknesses
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Table 1. Influence of PPLN crystal thickness on SHG from 780 nm to 1560 nm
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Table 2. Comparison of spectrum bandwidth, frequency bandwidth and pulse width with different thicknesses PPLNs
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