Abstract
With the advancement of ultra-fast and high-energy pulsed laser output, lasers have caused serious harm to precision instruments and human eyes. Therefore, the development of optical limiting materials with a fast response, low optical limiting threshold, and high damage threshold are important. In this work, for the first time, it is reported that phosphors Gd2O2S:Tb3+(GOS) displays exceptional functionality in laser protection. GOS with sizes of 11 μm, 1 μm, and 0.45 μm are prepared. Based on the optical limiting and Z-scan technology systems under 532 nm and 1064 nm nanosecond laser excitation, the nonlinear optical properties of GOS are investigated. It is found that GOS exhibits outstanding optical limiting properties. In addition, the optical limiting response of GOS is size-dependent. Concerning the largest particle size, GOS has the best nonlinear optical response, while the precursor shows no nonlinear optical performance. Meanwhile, GOS doped gel glass also displays excellent optical limiting properties with high transmittance, which preliminarily validates the application of GOS and other scintillators in nonlinear optics and encourages more research to better realize the potential of GOS.
Highlights
Lasers have been rapidly developed and widely used in medical, material processing, and micromachining fields, stimulating a rising demand for laser protection [1,2,3]
Optical limiting materials with a low onset limiting and optical limiting threshold are anticipated to serve as candidates for constructing emerging photonic devices [8,9]
Zhou et al demonstrated that the nonlinear optical (NLO) response of MoS2 and WS2 nanosheets were size-dependent [11]
Summary
Lasers have been rapidly developed and widely used in medical, material processing, and micromachining fields, stimulating a rising demand for laser protection [1,2,3]. GIt can be seen from Figure 2 that GOS with different sizes exhibit optical limiting performance at 532 nm and 1064 nm. The precursor Gd2O(CO3)2·H2O: Tb3+ shows no signal at the same condition (Figure S1), indicating that GOS has certain potential applications in a wide spectrum. Materials with low FON and FOL are predicted to be promising candidates in optical limiting applications. The nonlinear refraction signals show that three samples have a self-focusing effect These results prove that the GOS material has nonlinear optical properties, which are caused by the GOS material itself and the comprehensive results of a variety of effects, such as nonlinear absorption and nonlinear refraction.
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