Optical waveguide fabrication with double pulse femtosecond lasers
Optical waveguide fabrication with double pulse femtosecond lasers
复制标题
DOI：
10.1063/1.1954879
复制
发表时间：
2005-06
影响因子：
4
通讯作者：
T. Nagata;M. Kamata;M. Obara
中科院分区：
文献类型：
--
作者：
T. Nagata;M. Kamata;M. Obara
我们展示了使用双脉冲飞秒激光器在熔融石英玻璃内部制造光波导，以减少由于修改体积中折射率变化的不均匀性而引起的光损耗。双脉冲的脉冲间隔时间从500fs到200ps不等。在双脉冲模式下第一脉冲能量为30nJ、第二脉冲能量为160nJ、脉冲时间间隔为3ps的条件下，获得了小于0.8dB/cm的光损耗。弱的第一个脉冲将充当熔融石英的预处理器，然后第二个后续脉冲有效地引起均匀的折射率变化。对于使用单个 160nJ 脉冲飞秒激光器制造的波导，该光学损耗小于 1.3dB/cm。
We demonstrate the optical waveguide fabrication inside fused silica glasses using double pulse femtosecond lasers to decrease the optical loss which may be caused by nonuniformity of the refractive index change in the modified volume. The pulse separation time of the double pulses is varied from 500fsto200ps. An optical loss of less than 0.8dB∕cm is obtained under the conditions that the first pulse energy and the second pulse energy in the double pulse mode are 30 and 160nJ, respectively, and pulse time interval is 3ps. The weak first pulse would act as a pre-conditioner of the fused silica and then the second subsequent pulse effectively induces the uniform refractive index change. This optical loss is less than 1.3dB∕cm for the waveguides fabricated using a single 160nJ pulse femtosecond laser.