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Pair‐Emission‐Induced Near‐Infrared Lasing from Ceramic Ga:LaCrO3 Microcrystals at Room Temperature
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2021-02-08 , DOI: 10.1002/pssr.202000519 T. R. Rajalekshmi 1 , Tejendra Dixit 2 , M. S. Ramachandra Rao 3 , K. Sethupathi 1
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2021-02-08 , DOI: 10.1002/pssr.202000519 T. R. Rajalekshmi 1 , Tejendra Dixit 2 , M. S. Ramachandra Rao 3 , K. Sethupathi 1
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Lasing is observed in microcrystals of the Ga:LaCrO3 (LaCr0.5Ga0.5O3) perovskite system due to the pair emission of the Cr3+ ions, with a lifetime in the sub‐nanosecond range. Lasing due to pair emission is difficult to achieve in single‐crystal materials because of the difficulty in obtaining the dopant's compositional uniformity. This captivating ceramic material reveals an appreciable lasing profile with a 488 nm laser pumping. Characteristic laser emission centered at 740 nm is observed, with a linewidth of 2.09 nm and a threshold power of 73 W cm−2 at room temperature. Photoluminescence (PL) spectra show enhanced lasing characteristics at low‐temperature ranges. The time‐resolved PL spectrum of the sample illustrates a sub‐nanosecond lifetime of which 99.2% of the lifetime contribution is from pair emission. The short lifetime can be attributed to the high concentration of the Cr3+ ions, which enhances the Cr3+–Cr3+ exchange interaction, and pair emission, which is evidenced by an electron spin resonance study.
中文翻译：
室温下陶瓷Ga：LaCrO3微晶的成对发射近红外激光发射
由于Cr 3+离子的成对发射，在Ga：LaCrO 3（LaCr 0.5 Ga 0.5 O 3）钙钛矿体系的微晶中观察到激光发射，其寿命在亚纳秒范围内。在单晶材料中，由于成对发射引起的激光发射很难实现，因为很难获得掺杂剂的成分均匀性。这种引人入胜的陶瓷材料在488 nm激光泵浦下显示出可观的激光轮廓。观察到以740 nm为中心的特征激光发射，其线宽为2.09 nm，阈值功率为73 W cm -2在室温下。光致发光（PL）光谱在低温范围内显示出增强的激光发射特性。样品的时间分辨PL光谱说明了亚纳秒的寿命，其中99.2％的寿命贡献来自对发射。寿命短可归因于高浓度的Cr 3+离子，这增强了Cr 3+ -Cr 3+的交换相互作用和成对发射，这通过电子自旋共振研究得到证明。
更新日期：2021-04-08
中文翻译：
室温下陶瓷Ga：LaCrO3微晶的成对发射近红外激光发射
由于Cr 3+离子的成对发射，在Ga：LaCrO 3（LaCr 0.5 Ga 0.5 O 3）钙钛矿体系的微晶中观察到激光发射，其寿命在亚纳秒范围内。在单晶材料中，由于成对发射引起的激光发射很难实现，因为很难获得掺杂剂的成分均匀性。这种引人入胜的陶瓷材料在488 nm激光泵浦下显示出可观的激光轮廓。观察到以740 nm为中心的特征激光发射，其线宽为2.09 nm，阈值功率为73 W cm -2在室温下。光致发光（PL）光谱在低温范围内显示出增强的激光发射特性。样品的时间分辨PL光谱说明了亚纳秒的寿命，其中99.2％的寿命贡献来自对发射。寿命短可归因于高浓度的Cr 3+离子，这增强了Cr 3+ -Cr 3+的交换相互作用和成对发射，这通过电子自旋共振研究得到证明。
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