中国激光, 2018, 45 (12): 1206003, 网络出版: 2019-05-09
532 nm光诱导下低损耗As2S3光纤纤芯的光敏性及其光阻断效应现象 下载: 859次
Photosensitivity and Optical Stopping Effect of Low-Loss As2S3 Optical Fiber Core under 532 nm Light Irradiation
光纤光学 As2S3硫系玻璃光纤 光致折射率变化 光纤光栅 光阻断效应 fiber optics As2S3 chalcogenide glass fiber photoinduced refractive index change fiber gratings optical stopping effect
摘要
实验研究了低损耗硫系玻璃As2S3光纤的纤芯在532 nm近带隙光照射下的光敏性。实验结果表明,光开始照射时其纤芯的光致折射率变化朝负方向快速减小,然后随着光照时间延长,折射率变化朝正方向缓慢恢复增加。这两个过程经历的时间和折射率变化的大小均取决于光照功率。光照功率增大到一定阈值时,在恢复过程中,光致折射率变化出现正增加,且随光照功率继续增大和曝光时间延长,折射率变化可增加到约3×10
-3。另外,实验初步制备了As2S3光纤的布拉格光栅,曝光期间其中心波长先蓝移,后恢复并红移。同时,实验还发现,在近带隙光照下As2S3光纤出现光阻断效应现象, 其截止效率约为55%。
Abstract
The photosensitivity of a low-loss As2S3 chalcogenide glass fiber core under 532 nm near-bandgap light irradiation is experimentally investigated. The experimental results show that at the beginning of light irradiation, the photo-induced refractive index change of the fiber core first decreases rapidly towards the negative direction, and then recovers and increases gradually towards the positive direction with the extension of irradiation time. As for these two processes, the time duration and the refraction index change value are determined by light irradiation power. As the irradiation power increases to a certain threshold value, the photo-induced refractive index change shows a positive increment in the recovery process, and the refractive index change can be increased to about 3×10
-3 with the further increases of irradiation power and exposure time. In addition, the As2S3 fiber Bragg grating is experimentally fabricated and its central wavelength occurs blue shift-recovery-red shift during exposure. At the same time, the experimental results also disclose that the optical stopping phenomenon with a cut-off efficiency of about 55% is observed in the As2S3 fiber under near-bandgap light irradiation.
邹林儿, 张泽, 傅继武, 陈抱雪. 532 nm光诱导下低损耗As2S3光纤纤芯的光敏性及其光阻断效应现象[J]. 中国激光, 2018, 45(12): 1206003. Liner Zou, Ze Zhang, Jiwu Fu, Baoxue Chen. Photosensitivity and Optical Stopping Effect of Low-Loss As2S3 Optical Fiber Core under 532 nm Light Irradiation[J]. Chinese Journal of Lasers, 2018, 45(12): 1206003.