Q-switched lasing at the 2 µm wavelength induced by Cu18S nanocrystals
Year: 2019
Type: article
Abstract: In this paper, we first investigated the nonlinear optical properties of Cu1.8S nanocrystals (NCs) by using Z-scan and balanced twin detector measurement technologies, and then demonstrated a passively Q-switched laser at the 2 µm wavelength. The Cu1.8S NCs were synthesized by a solventless thermolysis method and then mixed with sodium carboxymethylcellulose to form the Cu1.8S NCs film. The film exhibited broadband surface plasmon resonance (SPR) absorption from 800 nm to 2000 nm. By incorporating the Cu1.8S NCs film into a thulium doped fiber laser cavity pumped by a 1570 nm fiber laser, stable passive Q-switching at ∼1975.16 nm was obtained for a threshold pump power of ∼931 mW, and ∼3.4 µs pulse duration with a pulse repetition rate of ∼35.14 kHz was also obtained for a pump power of ∼996 mW. Our results showed that Cu1.8S NCs is a promising saturable absorber (SA) for pulse laser generation at the 2 µm wavelength.
Source: OSA Continuum
Authors: Zhe Kang, Mingyi Liu, Jiaxing Liu, Jie Li, Jun Yi, Chujun Zhao, Dan Zhao, Weiping Qin, Guanshi Qin
Institutions: Jilin University, Hunan University
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,372
OpenAlex ID: W2974023766