激光是一种光，就像其他自然光一样，是由原子(分子或离子等)由过渡产生的。 但与普通光不同的是，它依赖于很短时间内的自发辐射，随后的过程完全由辐射决定，所以激光有一种非常纯净的颜色，几乎没有发散的方向、极高的发光强度和高的相干性。
Laser is a kind of light, which, like other natural light, is produced by atom (molecule or ion, etc.) transition. However, unlike ordinary light, laser depends on spontaneous emission only in the initial very www.paimen.org.cn www.boligangdiaos.cn www.tongding.net.cn www.renzaocaoping.org.cn www.duanluqi.org.cn www.diguandai.com.cnshort time, and the subsequent process is completely determined by stimulated radiation. Therefore, laser has very pure color, almost no divergence direction, extremely high luminous intensity and high coherence.
激光切割是利用激光聚焦产生的高功率密度能量来实现的。在计算机的控制下，脉冲放电，输出可控重复高频脉冲激光器，形成一定频率，具有一定脉冲宽度的光束，脉冲激光束通过光程传输和反射，并通过聚焦透镜组聚焦于被加工物体的表面，形成微妙的、高能密度斑，焦点位于被加工表面附近，在瞬时高温下熔化或蒸发被加工的材料。每一次高能激光脉冲都在物体表面瞬间溅射一个小孔，在计算机的控制下，基于预绘图形的激光加工头与被加工材料的连续相对运动，这样，物体将被加工成所需的形状。
Laser cutting is realized by using high power density energy produced by laser focusing. Under the control of computer, the laser is discharged by pulse, and the controlled repetitive high frequency pulsed laser is output to form a beam with a certain frequency and pulse width. The pulsed laser beam is transmitted and reflected through the optical path and focused on the surface of the processed object through the focusing lens group, forming a fine, high energy density spot near the surface to be processed. The material is processed by instantaneous melting or gasification at high temperature. Every high-energy laser pulse instantaneously splashes a small hole on the surface of the object. Under the control of computer, the laser processing head and the processed material move continuously and relative to each other according to the pre-drawn figure, so that the object can be processed into the desired shape.