Journal
OPTICAL MATERIALS
Volume 119, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2021.111302
Keywords
Fe3O4 nanoparticles; Polyimide; Reverse saturable absorption; Passive Q-switching; Saturable absorption
Categories
Funding
- National Natural Science Foundation of China [61804013, 61805023, 61804014]
- Excellent Youth Foundation of Jilin Province [20180520194JH]
- Changchun University of Science and Technology Youth Science Foundation [XQNJJ-2017-20]
- Jilin Science and Technology Development Plan [20180519018JH]
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Fe3O4 (FO) nanoparticles (NPs) - polyimide (PI) film was used as saturable absorber (SA), achieving passive Q-switched output at 1.5 μm. By adjusting the ratio of FO NPs to PI, the laser output characteristics can be further optimized, resulting in simultaneous compression of repetition rate and pulse duration for the first time.
Fe3O4 (FO) nanoparticles (NPs) - polyimide (PI) film was used as saturable absorber (SA), and achieved passive Q-switched output at 1.5 mu m successfully. Based on the reverse saturable and saturable absorptions of FO NPs-PI film, the laser output characteristics can be further optimized by adjusting the ratio of FO NPs to PI. When the ratio of FO NPs to PI is 1:5 (FO NPs-PI (1:5)), the pulse duration and repetition rate are 0.669 mu s and 5.51 kHz; this is the first time to realize the simultaneous compression of repetition rate and pulse duration. The single pulse energy and peak power are up to 364 nJ and 556 mW. The optical conversion efficiency can reach 855%, and it is about two orders of magnitude higher than other reports. The results show that it is helpful to construct high performance Q-switched pulse laser by introducing proper cavity loss through reverse saturable absorption.
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