Dynamical detection of optical phase changes during micro-welding of glass with ultra-short laser radiation
Dynamical detection of optical phase changes during micro-welding of glass with ultra-short laser radiation
复制标题
超短激光辐射玻璃微焊接过程中光学相位变化的动态检测
DOI：
10.1088/0957-0233/19/1/015302
复制
发表时间：
2007
影响因子：
2.4
通讯作者：
Udo Brenk
中科院分区：
文献类型：
--
作者：
A. Horn;I. Mingareev;J. Gottmann;Alexandra Werth;Udo Brenk
微米和纳米技术的加速发展需要更快、更精确的应用和诊断工具。提出了一种新的超快速诊断方法，作为传统相位显微镜方法（Iatia QPm™）的进步。与使用一个CCD来检测三个物平面的传统方法相比，三个CCD分别且同时地检测这些平面。对TQPm测量技术进行了分析，并通过对商用光纤的光相位测量进行了验证。这种新的可视化技术提供了可靠的定量时间分辨测量的光学相位，瞬态折射率或动态几何形状的变化。焊接玻璃的结构和光学修改已观察到同轴原位熔化和焊接过程中的TQPm。使用超短脉冲激光焊接技术玻璃板（Schott D263）。通过使用飞秒激光辐射（tp = 350 fs，frep = 1 MHz），由显微镜物镜（2ω0 μm）聚焦在界面处，多光子吸收是主要现象。这导致热量积聚，从而导致玻璃熔化和焊接。
The accelerating developments in micro- and nanotechnology require faster and more precise tools for application and diagnostics. A new ultra-fast diagnostics is presented as an advancement of a conventional phase microscopy method (Iatia QPm™). In contrast to the conventional method using one CCD to detect three object planes, three CCDs detect these planes separately and simultaneously. The measurement technique named TQPm has been analyzed and validated by measuring the optical phase of a commercial fiber. This novel visualization technique affords reliable quantitative time-resolved measurements of the optical phase, the transient refractive index or the dynamical geometry changes. The structural and optical modifications of welded glass have been observed coaxially in situ during melting and welding by TQPm. Technical glass plates (Schott D263) have been welded using an ultra-short pulsed laser. By the use of femtosecond laser radiation (tp = 350 fs, frep = 1 MHz) focused by a microscope objective (2ω0 ≈ 4 µm) at the interface, multi-photon absorption is the dominant phenomenon. This causes heat accumulation and thereby glass melting and welding.