铟掺杂对Fe∶LiNbO3晶体近红外光折变性能的影响

采用在Fe∶LiNbO3中掺入了铟离子生长的双掺杂In∶Fe∶LiNbO3晶体,以波长为1064nm的近红外会聚光束作为记录光源,通过数字观测装置,对比研究了铟离子掺入前后Fe∶LiNbO3晶体和In∶Fe∶LiNbO3晶体的光折变性能。实验研究结果表明,铟离子掺入后晶体的光折变响应速度和抗光折变能力明显提高,饱和折射率变化量降低。初步分析认为,In∶Fe∶LiNbO3晶体光折变性能的增强是由于掺入的铟离子取代了部分光折变敏感中心,降低了光敏中心的数量,导致晶体光电导增大,响应时间随之缩短。

Action of Indium Doping on Near Infrared Photorefractive Properties of Fe∶LiNbO3 Crystal

In∶Fe∶LiNbO3 crystals have been grown by doping indium ions in Fe∶LiNbO3 crystals.Experimental demonstrations are performed by recording in Fe∶LiNbO3 and In∶Fe∶LiNbO3 crystals with a focused near infrared laser beam of 1064 nm wavelength.The near infrared photorefractive properties of Fe∶LiNbO3 and In∶Fe∶LiNbO3 crystals are comparatively studied by the digital observation device.The experimental research results show that the photorefractive response and the photorefractive resistance ability are improved highly,and the saturation refractive index change Δn decreases in the In∶Fe∶LiNbO3 crystal.The enhancement mechanism of photorefractive properties is preliminary discussed in In∶Fe∶LiNbO3 crystals.The modification of indium ions substitutes the sites of light sensitive centers in the In∶Fe∶LiNbO3 crystal,and the number of light sensitive centers is decreased rapidly.It also induces the improvement of photoconductive property and cut the response time.