Ediacarian Volcanic Rocks and Basic Dikes from the Lac Ifni Sector of the Central High Atlas Mountains:Petrographic Studies and Clinopyroxene Chemical Composition

The Ediacarian volcanic series from the Lac Ifni sector are composed of a large variety of rocks from basalts and rhyolites to intermediates facies such as andesites,rhyodacites and pyroclastites.All these rocks are intruded by dolerite dikes.Secondary processes are reflected by total serpentinization of olivine within basic andesite and by albitization

用液相外延制备1.11～1.67微米(100)GaInAsP/InP注入激光器

用液相外延工艺,在1.11～1.67微米的波长范围,制造了（100）GaInAsP/InP DH 激光器。用两相溶液法,在相同的温度条件下（热处理温度 Ts=670℃,生长温度 Tg-631℃）和相同的冷却速率（0.81°C/分钟）下,在1.2～1.65微米的波长范围,获得了低归一化阈值的 DH 激光器。还给出了激射波长与生长温度的依赖关系。三层结构的普通激光器,在1.2～1.52微米的波长范围,其归一化阈值电流密度 Jth/d 为4～5千安/厘米2/微米,而抗回熔层的四层结构的波长较长的激光器,在1.45～1.65微米波长范围,其归一化阈值电流密度为5～6千安/厘米2/微米。在约250～270K 拐点以上的温度范围,这些激光二极管的激射阈值随温度而更快地增加。在1.3微米波长下,激射波长与温度的依赖关系约为4埃/度,而在1.55微米波长,约为5埃/度。在1.3微米,谱线宽约为1000埃,在1.55微米,谱线宽约1400埃。在λ=1.51微米,获得了较长波长激光器室温连续工作,其阈值为200～350毫安。