2.18 渭m random laser action based on Cr²⁺:ZnSe nanocrystalline particles

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• 作者：Jiayu Yi ; Guoying Feng ; Chao Yang ; Hong Zhang ; Ke Yao ; Shouhuan Zhou
• 关键词：Random laser ; Laser materials ; Nanomaterials ; Mid-infrared laser ; Multi-scattering
• 刊名：Optics Communications
• 出版年：15 November, 2013
• 年：2013
• 卷：309
• 期：Complete
• 页码：170-174
• 全文大小：3144 K

文摘

An approach for fabricating Cr²⁺:ZnSe nanocrystalline particles by 355 nm nanosceond laser ablation of polycrystalline micron-sized powder in liquid environment is presented. The scanning electron micrscope and X-ray diffraction results reveal that the products are ZnSe cubic sphalerite structured nanocrystalline particles with an average size of 50 nm. Based on the Cr²⁺:ZnSe nanoparticles, typical random laser emissions centering at 2180 nm with a threshold of 0.35 mJ/pulse are observed for the first time. Compared to the micron-sized powder, it shows a blue-shift of 170 nm. With the pump energy increasing (above the threshold value), the decay time reduces to 30 ns from 1.2 渭s. Our experimental results demonstrate that the Cr²⁺:ZnSe nanoparticles random lasing emission appears in a wide pump wavelength range from 1500 to 1900 nm. The comparsions of the fluorescence, excitation spectra and threshold features between micron-sized particles and nanoparticles are also presented.