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Quasi Continuous Fiber Laser

Sep 19, 2017 by htpow

Quasi-continuous fiber lasers usher in gold development period. For enterprises, there are many reasons for the use of quasi-continuous (QCW) fiber lasers, such as fiber lasers combined with a pulsed Nd: YAG blue laser pointer drilling and welding advantages and a CO2 laser cutting capacity. In the past, many companies also had CO2 lasers and Nd: YAG lasers to cope with a wider range of processing needs and applications. QCW fiber lasers can operate in pulsed and continuous (CW) mode, so a single laser can handle a variety of machining tasks that require two different lasers in the past.

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Today, tens of thousands of fiber lasers are used all the time in the industry and the field. In many material processing applications, these laser systems are rapidly replacing the effects of Nd: YAG lasers and CO2 lasers. In addition, companies are replacing old lasers on existing production lines while ensuring that their existing equipment downtime is minimized. Quasi-continuous fiber lasers have now become part of the modern manufacturing plant. This type of laser can work simultaneously in both continuous and high peak power pulse modes. Unlike conventional continuous (CW) lasers, the peak and average power are always the same in CW and CW / modulation modes, while the peak power of the QCW laser in pulse mode is 10 times higher than the average power. Thus, it is possible to generate microsecond and millisecond pulses with high energy at repetitive frequencies from tens of hertz to several kilohertz and to achieve an average power and peak power of several kilowatts.

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Fiber laser resonator is a solid-state laser, equipped with a permanent seal connected to the continuous fiber to prevent dust and dirt generation, and does not contain moving parts or free space lenses, resonators without any adjustments, no supplies, no maintenance The These features help to ensure the performance of the laser pointer, so that it maintains stability and consistency during years of operation. In the absence of consumable parts, the output power is not attenuated, the beam quality of the laser output remains the same, and no longer requires the technician to make regular adjustments to maintain the normal operation of the laser processing system.

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Electro-optical conversion efficiency (WPE) refers to the efficiency of the laser will be converted to light output power efficiency indicators. The solid-state fiber resonator of the QCW fiber laser can effectively dissipate heat based on its large surface area / volume ratio, enabling an electro-optical conversion efficiency of more than 30% under a passive cooling scheme. Because QCW fiber lasers provide ten times more WPE increments compared to other laser systems, it is not difficult to understand why the acceptance of such lasers has been rapidly expanding in recent years. Significantly reduced electricity costs, plus no consumables, no spare parts as well as low maintenance requirements, no warm-up time requirements, and ultimately bring considerable cost optimization.

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One of the advantages of QCW fiber lasers is the ability to quickly increase and decrease power levels and can switch from pulse mode to continuous operation mode online. This is achievable in view of the fact that there is no thermal response in the fiber resonator without the thermal lens and the pump diode, but this can not be done if the astronomy laser pointer is used to pump the laser. A single QCW fiber laser pulse can be modulated using analog or internal pulse generators to achieve the optimum time pulse shape required for any particular application. The operator can also preprogram the required pulse sequence using the customized repetition frequency and power modulation.

Lasers using conventional techniques typically require a warm-up time to stabilize the resonator and ensure that the correct laser power is continuously transmitted to the workpiece. These lasers are usually operated in standby mode when no machining is performed, and only the lamp pump continues to flash to ensure the stability of the resonator. In this case, even if the laser is not used for the production of parts, but the life of the flash and the use of the period is always passing. In contrast, the fiber laser is pumped by a solid diode, so that it is completely closed when the laser is not in use and the correct laser power can be obtained without warm-up time. Since fiber lasers are only turned on when the process is ready, higher uptime, electrical efficiency, and throughput are achieved.

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The aerospace industry has demonstrated that holes drilled with fiber lasers can achieve consistent flow characteristics. This is due to the improvement in the red laser pointer output and the reproducibility of the flattened beam waveforms. Using a QCW fiber laser, the tip of the drilled hole is smaller in the flattened beam shape. Whether it is impact drilling or ring cutting, the flattened beam shape usually results in a smaller taper. Compared to the impact of drilling, ring cutting the additional advantage of the hole is smaller. Fiber lasers do not use thermal lenses, spot size remains constant, does not increase or decrease with power.

The combination of single-mode high power density, high pulse energy, high peak power and high repetition frequency enables high-capacity laser micromachining to achieve a wide range of materials including metal, silicon, alumina, sapphire and glass.

Fiber laser technology enables very high power in very small packages. This is very attractive for most companies because the reduced footprint of the laser results in a reduction in the overall space required for the integrated 200mw green laser process. Global companies seem to have been looking for ways to fill more stuff in less space, and low space for fiber lasers can do that. No need to calibrate, maintain and replace free space optics or lenses. The operating fiber is equipped with a quick disconnect connector, and if you need to replace the fiber, no beam calibration is required.

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Quasi Continuous Fiber Laser

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