Feifei Guo,Lijuan Chen,Fuan Liu,Tingting Cao,Youxuan Sun,Zeliang Gao,Xutang Tao
Multifunctional composite crystals have received great attention as an effective way to simplify the laser cavity . In this work, a self-Q-switched Raman laser operating at 1178 nm is demonstrated by using a multifunctional composite crystal BaTeW 2 O 9 (BTW). An acousto-optic modulator (AOM) with a diffraction efficiency of 74% is designed and fabricated based on the Raman crystal BTW. A 1064 nm pulsed laser with a maximum single pulse energy of 260.6 μJ corresponding to a pulse width of 42 ns is obtained by inserting the BTW AOM into the laser cavity with Nd: YAG as the laser gain medium. Then an 1178 nm self-Q-switched Raman laser with the maximum single pulse energy of 22.8 μJ corresponding to a pulse width of 10 ns is successfully obtained. This work not only provides a competitive multifunctional composite device that can simplify the Raman laser cavity design but also has guiding significance for the design and development of multifunctional composite crystals.
Feifei Guo,Fuai Hu,Yufei Song,Lei Wang,Zeliang Gao,Xutang Tao
X-ray detection materials and devices have received widespread attention due to their irreplaceable role in the medical, industrial, and military fields. In this paper, BaTeW2O9 (BTW) crystal containing lone pairs of electrons with large atomic numbers and high density is reported as a new type of oxide crystal X-ray detection material. The anisotropic X-ray detection performance of the BTW single crystal (SC) is systematically studied. At 120 keV hard X-ray photon energy, the BTW SC X-ray detectors along the crystallographic a-, b-, and c-axes directions achieved high sensitivities of 371, 404, and 368 μC Gyair–1 cm–2 respectively. More importantly, no dark current drift phenomenon was observed in the BTW SC X-ray detectors. The dark current drifts along the crystallographic a-, b-, and c-axes directions are as low as 7.81 × 10–9, 8.61 × 10–9, and 7.71 × 10–9 nA cm–1 s–1 V–1, respectively. In addition, the BTW SC X-ray detector has an ultralow detection limit of 21.9 nGyair s–1. Our research provides a new X-ray detection material with potential application value and a new material design strategy for the field of radiation detection.
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