Laser plates

Von Gutfeld, R. S., M. H. Gelchinski, and L. T. Romankiw. Maskless laser plating techniques for microelectronic materials. Proc. SPIE... 

FIGURE 63.5 Micro-blind vias drilled by different lasers, (a) Excimer laser, plated hole diameter 25 micrometer (b) YAG laser, plated hole diameter 20 micrometer, (c) Carbon dioxide laser, plated hole diameter 100 micrometer. (Source Photo Machining.)... 

Imaging plates are exposed similar to radiographic films. They are read out by a LASER-scanner to a digital image without any developing process. After optical erasing of the virtual picture the same IP can be used cyclic up to more than 1000 times. The life time is limited by the mechanical stability of the IP s. An IP consists of a flexible polymer carrier which is coated with the sensitive layer. This layer is covered with a thin transparent protective foil. 

This paper deals with the control of weld depth penetration for cylinders in gold-nickel alloy and tantalum. After introducing the experimental set-up and the samples description, the study and the optimization of the testing are presented for single-sided measurements either in a pulse-echo configuration or when the pump and the probe laser beams are shifted (influence of a thermal phenomenon), and for different kind of laser impact (a line or a circular spot). First, the ultrasonic system is used to detect and to size a flat bottom hole in an aluminium plate. Indeed, when the width of the hole is reduced, its shape is nearly similar to the one of a slot. Then, the optimization is accomplished for... 

The development of mote intense sources (eg, plasma sources, soft x-ray lasers, and synchrotron sources) has made possible highly effective instmments both for x-ray microscopy and x-ray diffraction on a few cubic nanometer sample. The optical problem of focusing x-rays is accompHshed by the use of zone plates or by improved grazing incidence or multilayer reflectors. 

Fig. 10. Photopolymer plate stmcture and process of use A, upon exposure to laser light, V B, upon heating to 120°C and C, after development, rinsing,...

Fig. 11. Electiophotogiaphic plate structure and process of use (a) laser exposure of the negatively charged photoconductor, o, sitting on the plate surface ...

Fig. 12. Sdvet hahde on diazo plate (a) stmcmre upon imagewise laser exposure (b) development of sdvet image (c) fixation of unexposed areas (d) after...

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