For several spectroscopy applications, there is a high demand for the small and economical fiber-coupled highpower laser system. In our case, a high-energy DPSS laser pulse was delivered by an optical fiber. For the reason of cost efficiency, we used commercially available “off the shelf” components, like pump diodes, multimode optical fibers and 3D printed components. In this case, the challenge is that the focused high-energy laser pulses can easily damage the optical fiber. To avoid this problem, we redesigned the entire laser cavity structure, optimizing the laser beam characteristics that fit a special fiber coupling module. In this work, we are presenting the development of a compact, low-price, high-energy Q-Switched Nd:YAG laser with a directly connected optical fiber using commercially available components.
Silicon-glass microcavities have been widely used as a functional packaging method for many applications since its founding. During the process, sodium ion (Na+) gains mobility due to the high temperature and moves towards the cathode, where it receives an electron and further moves outside the glass, forming metal liquid at the glass/cathode interface, since the melting point of Na is 97.79 ºC. Naturally, a part of Na will stay at the cathode after the wafer is removed, and, without a proper cleaning, it accumulates. This allows liquid Na droplets to be blown inside the silicon/glass interface with a gas flow at the later bonding process, which can strongly influence the sensitive silicon elements. Standard methods such as Raman or mass spectroscopy are not appropriate for this application, because the contamination is either not detectable or the cavity will be destroyed. In this study, we experimentally analyzed the closed system using laser induced breakdown spectroscopy (LIBS). With a high-intensity laser, a gas breakdown was generated inside the cavity and measured via optical emission spectrum. The study was performed in two steps: first, the minimal dimension of the cavity was determined in order to not damage the walls; second, the system was fabricated according to the results from last step, and the measurement concept was proved.
For portable spectroscopic systems, there is a high demand for smaller and economical laser modules. Heat management is essential in high-energy laser systems, but the “classic” external cooling methods are increasing the overall size of the laser. To avoid this problem, we implemented a “static”, non-circulated liquid cooling system. The laser cavity is hermetically sealed after it is filled up with liquid, no external liquid container is necessary. In this work, we present the development of a compact, low price, high energy Q-Switched Nd:YAG laser using commercially available components.
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