femtosecond laser micromachining and computer modeling of ultracompact fiber inline Mach-Zehnder interferometer sensor based on a U-shape microcavity
An ultracompact fiber inline Mach-Zehnder interferometer (MZI) has been formed by side-ablating a V-shape microcavity in a single-mode optical fiber with the fiber core partially removed using a femtosecond (fs) laser, in which the two light paths are accordingly the U-shape microcavity and the remained D-type fiber core. Computer modeling of beam propagation method (BPM) analysis is utilized to illustrate the dependences of a good transmission spectrum on the ablation depth, the ablation length and the U-shape micocavity refractive index, which gives some guideline to optimize parameters for fs laser micromachining process, and estimates refractive index (Rl) sensitivity and temperature sensitivity within certain range. That is, with the ablation depth of 63.5um and the ablation length of 150um simulated in BPM analysis, the Rl sensitivities of-3243.7 ± 0.65nm/KIU for different gases and -10789.29 ±18.91nm/RIU for different solution concentrations and the temperature sensitivity of 37.42 ± 0.07pm/℃ are predicted respectively.
femtosencond laser micromachining beam propagation method mach-zehnder interferometer optical fiber sensor refractive index temperature
Longjiang Zhao
School of Mechanical Engineering Beijing Institute of Technology Beijing, China
国际会议
上海
英文
162-165
2011-03-11（万方平台首次上网日期，不代表论文的发表时间）