Laser Processing Technology

March 06 [Mon], 2017, 18:35
Today, laser processing technology because of its high efficiency, high precision, non-contact processing and other characteristics, has become the darling of industrial applications for high quality, efficient, environmentally friendly processing and production has opened up broad prospects. CO2 laser, fiber 3000mw laser pointer and semiconductor laser is the mainstream of industrial applications in the laser, the laser pulse width in microseconds, nanosecond level. This pulse width of the laser is through the photothermal effect to remove the material, there will be "hot processing" effect.

Laser, as emerging processing technology, faces more challenges. The heat affected zone, fusing residue and strain crack caused by the "hot working" effect are the main reasons to limit the precision, efficiency and process repeatability of the workpiece. With the development of industrial applications, the feasibility of processing, processing quality and processing efficiency have put forward higher requirements. For some of the harsh machining tasks required in the field of laser micromachines, the adverse effects of "hot working" make it possible for microseconds, nanosecond pulse widths to meet their requirements.

In order to further improve the processing accuracy, reduce the thermal impact of the process and the adverse effects of thermal effects, picosecond laser gradually penetrate into the industrial applications. Picosecond laser with picosecond ultrashort pulse width, processing materials, brightest laser pointer photon direct destruction of the target material bond, which is relatively a "cold" processing, heat affected zone is very small, almost no heat affected zone, The whole process is very clean, there is no recast casting materials, and therefore rarely need to post-processing. Picosecond laser these characteristics doomed it in the field of laser micro-processing an important position.

Fiber lasers use rare earth doped fiber as the active medium, with laser diodes as the pump source, which inherently has some key advantages, making them in the mold through the generation of ultra-short pulse is quite attractive. The high gain bandwidth and efficiency of doped fibers allows the manufacture of relatively inexpensive, compact, rugged fiber laser systems that provide a wide range of fiber-coupled output beams for a wide range of applications. Fiber lasers are initially limited to continuous (CW), low power, single mode operation. After more than 30 years of development, fiber most powerful laser pointer have been able to achieve single mode and multimode operation. The wavelength range covers UV (UV) to far infrared (Far-IR) band, and can provide a very high power level, variable repetition frequency, and milliseconds to femtosecond pulse width.

Unlike traditional free-space lasers, fiber lasers use fiber and fiber Bragg gratings (FBG), which replace conventional dielectric mirrors for optical feedback. Most high-power fiber lasers use a double-clad fiber architecture, where the gain medium is in the fiber core, surrounded by two layers of cladding. A multimode pump beam from a laser diode or another fiber laser propagates in the inner cladding and is constrained by the outer cladding to excite the active medium and produce a lasing pattern that propagates in the fiber core. In order to produce ultrafast laser pulses, active or passive mode-locking techniques are required. Some of the techniques used today for passive clamping include nonlinear polarization rotation and saturation absorption techniques, while electro-optic or acousto-optic modulators are used for active mode-locking.

EL H beam project leader Roman Hvezda added that the HAPLS system research and development has been "everything from Jane." "According to the design requirements, no one else can use the limited budget for the delivery of the system in such a short period of time.With the cooperation with the well-established Livermore laboratory, we have benefited a lot, and this is also the future of both Continue to work together to lay the foundation. "In the development of the entire burning laser system, LLNL and ELI beam project scientists and engineers have always maintained close cooperation. "One of the real successes of trying to get is that from the very beginning, the commissioning party is fully engaged in the commissioning and operation of the laser system, which provides the conditions for the entry of training and expertise, effectively ensuring that the laser integration process "The HAPLS system is currently being transferred to the ELI beam project base and will then be integrated into the laser transmission and control system to generate laser pulses in excess of 1 pts at 10 Hz repetition.

Laser as an advanced processing tool, has more and more widely in the industrial production plays a pivotal role. With the continuous development of 5000mw green laser technology, its by virtue of the processing quality, processing complexity, processing efficiency and clean environmental protection and other advantages, not only in the stainless steel, copper, alloy and other metal materials processing favored, but also in the glass , Ceramics, sapphire, semiconductor silicon wafers, PCB board and other non-metallic materials processing highlights the unique advantages.
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