垂直外腔面发射激光器(VECSEL)可以实现大功率的高光束质量输出。针对外腔制作工艺复杂、腔体结构松散的缺点,研制了一种介质膜集成衬底表面外腔底面发射激光器。将衬底表面生长的多层介质绝缘薄膜与N-DBR、P-DBR共同构成复合腔结构,衬...垂直外腔面发射激光器(VECSEL)可以实现大功率的高光束质量输出。针对外腔制作工艺复杂、腔体结构松散的缺点,研制了一种介质膜集成衬底表面外腔底面发射激光器。将衬底表面生长的多层介质绝缘薄膜与N-DBR、P-DBR共同构成复合腔结构,衬底充当外腔。该结构能够抑制高阶模式,进而优化输出光谱及远场发散角等光束特性。在已有的理论指导下,制作了有源区直径为200μm、外腔腔长250μm的VECSEL。室温下,向器件连续直流注入3.4 A,测试得到输出功率为260 m W,远场发散角的半角宽度为3.8°,光谱半高全宽为0.046 nm。与常规结构底面发射VCSEL进行比较,发现VECSEL器件的光束质量得到了明显改善,实验结果与理论仿真结果有较好的一致性。展开更多
Baculum chongxinense chen et He has one generation every two years in Chongxin county, Gansu province. It overwinters as egg under the litter and in the soil. The egg diapause in the second year. It reproduces as part...Baculum chongxinense chen et He has one generation every two years in Chongxin county, Gansu province. It overwinters as egg under the litter and in the soil. The egg diapause in the second year. It reproduces as parthenenesis. The larva has 3 instar. Each female laid about 40 eggs. The adult female feeds on the host voraciously. The use of Lindan smokes at the rate of 15?kg·hm -2 , Lindan dust at 30?kg·hm -2 , and 2.5% Gongfu EC or 2.5% Decis EC at 8 000～10 000×or ultra low volume concentrates at 3?kg·hm -2 for the control of the pest obtained over 90% mortality respectively.展开更多
文摘垂直外腔面发射激光器(VECSEL)可以实现大功率的高光束质量输出。针对外腔制作工艺复杂、腔体结构松散的缺点,研制了一种介质膜集成衬底表面外腔底面发射激光器。将衬底表面生长的多层介质绝缘薄膜与N-DBR、P-DBR共同构成复合腔结构,衬底充当外腔。该结构能够抑制高阶模式,进而优化输出光谱及远场发散角等光束特性。在已有的理论指导下,制作了有源区直径为200μm、外腔腔长250μm的VECSEL。室温下,向器件连续直流注入3.4 A,测试得到输出功率为260 m W,远场发散角的半角宽度为3.8°,光谱半高全宽为0.046 nm。与常规结构底面发射VCSEL进行比较,发现VECSEL器件的光束质量得到了明显改善,实验结果与理论仿真结果有较好的一致性。
文摘Baculum chongxinense chen et He has one generation every two years in Chongxin county, Gansu province. It overwinters as egg under the litter and in the soil. The egg diapause in the second year. It reproduces as parthenenesis. The larva has 3 instar. Each female laid about 40 eggs. The adult female feeds on the host voraciously. The use of Lindan smokes at the rate of 15?kg·hm -2 , Lindan dust at 30?kg·hm -2 , and 2.5% Gongfu EC or 2.5% Decis EC at 8 000～10 000×or ultra low volume concentrates at 3?kg·hm -2 for the control of the pest obtained over 90% mortality respectively.
