β-BaB2O4 with special cut-angle applied to single crystal cascaded third-harmonic generation

• 来源期刊: 中国物理B（英文版）
• 关键词: polarization frequency conversion β-BaB2O4 crystal nonlinear optical crystals optical frequency converters
• 年，卷（期）: 2018,（11）
• 页码范围: 477-480
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/11/114202

摘要

High-efficiency single crystal cascaded third-harmonic generation (THG) was realized in β-BaB2O4 (BBO) material with special cut-angle.By analyzing effective nonlinear optical coefficient (deff) of the cascaded THG process,which was composed by type-Ⅱ frequency doubling and type-Ⅰ sum-frequency,the optimum phase matching (PM) direction in BBO crystal was determined to be (θ =32.1°,φ =11°).With an optimized 9-mm long sample which was processed along this direction,the highest cascaded THG conversion efficiency reached 42.3％,which is much superior to the similar components reported previously,including ADP,KDP,and GdxY1-xCOB crystals.