Broadband and multi-wavelength laser is an emerging research direction with promising future applications. The optical parametric oscillator has the characteristic of wide tunable wavelength and the zinc sulfide polycrystal doped with Cr2+ ions have a wide absorption spectrum. Combining the advantages of both output and input, a unique cascade structure using optical parametric oscillator as pump source is constructed for Cr2+:ZnS laser resonator. The output advantages of the cascade laser are studied by analyzing the characteristics of the continuous wave and pulse laser output from the experimental device. The experimental system successfully outputs a laser with a wavelength of 2330 nm and an average power of over 510 mW. The experimental system realizes the laser output of four wavelengths over 2000 nm in the three spectral regions of near infrared, short wave infrared and medium wave infrared. The experimental results provide a new idea and reference for differential absorption measurement and multi-component material measurement in toxic gas molecular detection and optical measurement.
Corrosion behaviors of the precursor glass (ZBLAN) of fluoride fibers in solutions of different pH values are studied. After seven d of corrosion, the infrared transmittance of ZBLAN decreases to almost 0 in acidic and neutral environments. However, there is no significant loss of transmittance in an alkaline environment. Similarly, the surfaces of the samples in acidic or neutral environments are severely corroded, whereas in alkaline environments, they are slightly corroded. In addition, it is found that samples corroded in neutral water have a complete crystallization phenomenon, wherein complex crystal phases emerged. However, no characteristic peaks of the crystal phase are observed in the samples corroded in the acidic and alkaline environments. The corrosion mechanism is investigated based on the change in the concentration of ZBLAN constituent elements in the solution via inductively coupled plasma (ICP) emission spectrometry.
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