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Growth and properties of (Cr3+, Nd3+) doped GdCa4O(BO3)3 crystals

✍ Scribed by Shujun Zhang; Zhenxiang Cheng; Guangyong Zhou; Yuming Sung; Xueyuan Hou; Xuesong Liu; Jianru Han; Zongshu Shao; Huanchu Chen

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 646 KB
Volume: 40
Category: Article
ISSN: 0960-8974
DOI: 10.1016/s0960-8974(00)00022-x

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✦ Synopsis

Optical quality Nd:GdCa40(BO3)3 (Nd:GdCOB) crystal and chromium sensitized crystal of Cr:Nd:GdCa40(BO3)3 (Cr:Nd:GdCOB) were grown by the Czochralski (CZ) method. The transmittance spectra was measured at room temperature on 7at%Nd:GdCOB and lat%Cr:7at%Nd:GdCOB samples. The absorption in the blue-UV region of Cr:Nd:GdCOB was larger than that of Nd:GdCOB, which matched the xenon flash lamp very well. A 3x3xl0mm 3 Nd:GdCOB sample without any antireflective coating was sidepumped using a pulsed dye-laser tuned to 595.4um. The green-light output energy was 1.35mJ at a pump energy of 17.5mJ. The conversion efficiency was 7.7%, and the threshold energy was less than 1.2mJ which are the best results up to now to our knowledge. 3x3x7mm 3 Nd:GdCOB and Cr:Nd:GdCOB samples without antireflective coatings were pumped using a flash pump source. The threshold for Cr:Nd:GdCOB was 0.9J while for Nd:GdCOB it was 1.0J. The output green light energy was 2.46mJ for Cr:Nd:GdCOB at a 10J flash pump energy and was 1.96mJ for Nd:GdCOB at the same pump energy, which clearly shows that Cr 3+ ions have the sensitizing effect on the Nd3+ ions in Nd:GdCOB crystal.

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