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Growth and laser properties of Nd:Ca4YO(BO3)3 crystal |
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| Authors: | H J Zhang X L Meng L Zhu C Q Wang R P Cheng W T Yu S J Zhang L K Sun Y T Chow W L Zhang H Wang K S Wong |
| Institution: | a National Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan 250100, China b Department of Electronic Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China c Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China |
| Abstract: | Nd:Ca4YO(BO3)3 (Nd:YCOB) crystal was grown by the Czochralski method, and its structure was measured by using a four circle X-ray diffractometer. The transparent spectrum from 200 to 2600 nm was measured at room temperature. The fluorescence spectrum near 1.06 μm showed that the main emission wavelength of Nd:YCOB crystal was centered at 1060.8 nm. Laser output at 1.06 μm has been demonstrated when it was pumped by a Ti:sapphire laser at the wavelength of 794 nm, the highest output power was 68 mW under pumping power of 311 mW, the pumping threshold was 163 mW and slope efficiency was 46.9%. The self-frequency doubled green light has been observed when it was pumped by a Ti:sapphire or a laser diode (LD). A 14.5 mm Nd:YCOB crystal sample cut at (θ, φ)=(90°, 33°) was used for type I second-frequency generation (SHG) of the 1.06 μm laser pulse. The SHG conversion efficiency was 22%. |
| Keywords: | Nd:Ca4YO(BO3)3 Crystal growth Spectroscopy Laser performance |
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