منابع مشابه
Nonminimum Phase Behavior of Laser Material Processing
Optical sensors are increasingly applied in laser material processing to monitor and control the lasermaterial interaction zone. Dynamic models, relating the sensor signals (e.g. as temperature or molten area) to the process inputs (e.g. laser power or beam velocity), provide the basis for the design and tuning of a feedback controller. These models can show nonminimum phase (NMP) behavior. Thi...
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An adaptive optics system is used for correcting tip-tilt disturbances in an experimental laser material processing setup. The proposed tip-tilt controller is based on PI-controllers that are fed with disturbance estimates from a Kalmanfilter. In addition, delays due to wavefront computation in the wavefront sensor and from data transmission are taken into account in the loop-shaping design. La...
متن کاملTubular filamentation for laser material processing
An open challenge in the important field of femtosecond laser material processing is the controlled internal structuring of dielectric materials. Although the availability of high energy high repetition rate femtosecond lasers has led to many advances in this field, writing structures within transparent dielectrics at intensities exceeding 10(13) W/cm(2) has remained difficult as it is associat...
متن کاملPicosecond Laser Processing – Material Removal Rates of Plastics
A picosecond UV laser has been used to establish the material removal rate of plastics. Varied processing parameters include laser power, pulse frequency and scanning velocity. The wave length of the laser used was 355 nm. Scanning velocity varied between 100 to 800 mm/s and repetition frequency between 10 to 500 kHz. Materials for the experiments were generally used plastics, which were availa...
متن کاملPicosecond Laser Processing – Material Removal Rates of Metals
A picosecond laser has been used to establish the material removal rate of metals. Varied processing parameters include laser power, pulse frequency and scanning velocity. The laser beam was manipulated using a galvanometric scan head with a 100 mm focusing optic. Maximum power of the laser in the IR was 2 W and 700 mW in the UV. Scanning velocities were varied between 100 to 800 mm/s. Material...
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ژورنال
عنوان ژورنال: The Review of Laser Engineering
سال: 1997
ISSN: 0387-0200,1349-6603
DOI: 10.2184/lsj.25.266