Multi-wavelength passively Q-switched laser with Co2+:ZnSe thin film coated microsphere. (6th March 2023)

• Record Type: Journal Article
• Authors: Wu, Zhujing; Zhang, Hong; Zhu, Yuehong; Huang, Yulei; Yang, Huomu; Deng, Guoliang; Zhou, Shouhuan
• Is Part Of: Laser physics letters. Volume 20:Number 4(2023)
• Publication Date: 2023-03-06
• Subjects: fiber laser -- multi-wavelength laser -- saturable absorber -- Co2+:ZnSe film -- microsphere resonator; Lasers -- Periodicals; Physics -- Periodicals; 621.366
• DOI: 10.1088/1612-202X/acbf3d
• Languages: English
• ISSNs: 1612-2011

Abstract

Abstract: We experimentally demonstrate an all-fiber passively Q -switched erbium-doped laser based on a microsphere resonator coated with Co 2+ :ZnSe film, which can achieve multi-wavelength pulse laser. With electron beam evaporation technology, the saturable absorber (SA) with a modulation depth of 55% was prepared by depositing Co 2+ :ZnSe film on the microsphere for the loss modulation of the laser cavity. The passively Q -switched output pulses were obtained by inserting the SA into the laser cavity and the narrowest pulse width of ∼3 μ s was obtained. The fiber laser can stably output quintuple-wavelength laser pulses with a 3 dB bandwidth of ∼0.1 nm. The wavelength interval of multi-wavelengths was stably maintained at ∼1 nm and the smallest optical signal-to-noise ratio of ∼10 dB at the pump power of 400 mW was measured. The signal-to-noise ratio was ∼58 dB, which confirms excellent output stability. The results prove that it is a promising SA device to achieve passively Q -switched multi-wavelength pulse fiber lasers.