A Q-switched mode-locked (QML) laser at 2 μm waveband is demonstrated with with a maximum average power of watts. Graphene oxide are prepared by the vertical growth method and employed as a saturable absorber for passively QML operation. The stable QML pulses at 1897 nm are obtained with pulse width of 5.04 ns. The maximum output power of the laser is 1050 mW with a pump power of 20 W for an output coupler of 9%. The repetition frequency and width of QML pulses are 53.19 MHz and 5.04 ns, respectively. The modulation depth reach almost 100%. The Watt level QML all-solid-state Tm, Ho:LLF ceramic laser has broad application prospects in space target detection, environmental detection, and nonlinear optical research.
In this paper, we presented the inscription and sensing characteristics of eccentric fiber Bragg gratings (EFBGs) through femtosecond laser. This kind of fiber grating is caused by localized refractive index modulation that deviates from the center of the fiber core. EFBGs were prepared in SMF-28 single-mode fiber by 800nm femtosecond laser point-by-point writing method. The temperature and refractive index sensing properties of the prepared EFBG were investigated. The experimental results show that both the Bragg wavelength and cladding mode resonance wavelength of EFBG increase linearly with temperature and show extremely high-temperature robustness. The temperature sensitivity of Bragg resonance is 14.4 pm/℃. As the SRI increases, the Bragg peak remains unchanged and the cutoff wavelength of EFBG cladding mode resonance red-shifts with a sensitivity of 649.29 nm/RIU.
Two kinds of full-filled photonic crystal fibers (PCFs) with different air hole size were investigated by experiments. All
the air holes were filled with liquid crystal (LC). The full-filled part was heated to different temperatures to research the
transmission character. In different temperature conditions, below or over 65°C, the two kinds full-filled LC-PCFs had
their own performance. Mode coupling analysis and LC phase theory were used to explain their different performance.
By researching their output light spots and transmission spectra, we demonstrated that LC-PCFs could be applied in
optical switching, filter, attenuator or other optical devices.
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