In all the process parameters, the most influential is the laser power and space and time domain in the distribution. Some scholars of the spatial distribution of laser power and beam real-time diagnostics and control research [2, 3, 7, 8]. By scanning across the metal wire or optical path rotating mirror, a laser beam analyzer (LBA) will be able to measure the laser intensity. LBA will wire or mirror scan information into a voltage signal, obtained after analysis of the spatial distribution of the laser beam, laser beam to construct three-dimensional maps and access to non-focus area of the beam intensity. There are many color choices forgreen laser pointer. Beam distribution can be used for diagnosis of adjustment laser resonator [3], is the adjustment of the optical cavity mirror position, you can compensate for the measured beam distribution and printing the error between the approved plans, shown in Figure 2. By analyzing the convergence, focus and emission beam image, you can evaluate the focusing lens and beam delivery system performance. The measured parameters include focus on power density, the focus diameter, working distance and beam divergence angle. LBA enables closed-loop control of the minimum laser power fluctuations, the current through the laser cavity can be compensated for the error [3]. Laser beam analysis to detect and control the rapid fluctuations in the beam measurement method, but not directly consider the ablation surface of LBA or heat-affected zone of the actual situation. Various colors can be provided for this kind ofGreen laser pointer.Not sensitive to the processing of interference, such as material impurities, plasma formation, melting layer formation, flow and speed fluctuations. In the process control loop to monitor the beam intensity and to maintain its stability, but can not ensure a certain stability during processing. Using the photodiode array, available ablation surface images. Once generated, the image, you can determine the ablation surface geometry of some of the characteristic values. Shown in Figure 3, GaAs fluctuations in the image window will be reflected to the ablation surface of the CCD Camera. According to the shape and brightness of the image can be laser-cut features into three categories: natural, good quality and non-penetrating. This adaptive closed-loop control can be used to monitor and adjust the laser cutting process parameters, such as laser workpiece movement, the laser head and the auxiliary gas pressure [2]. The customer has stated the color choice ofgreen laser pointerin the order. Schottky diode matrix focal plane array camera instrument can laser ablation process in the face of infrared imaging [5]. Shown in Figure 4, video camera and into a 30 ° angle between the laser, that is non-coaxial placement. Each diode detected photon flow into a temperature value (using Planck's law). All accumulated to form the diode temperature ablation surface temperature field. Carved along the centerline temperature measurements show that the ablation surface temperature field can be divided into three zones: a sharp rise in the temperature zone, high temperature stability and temperature drop zone area. In the known properties of the workpiece material, such as melting / vaporization temperature, conductivity-temperature rate, emissivity and absorption rate, calculated according to the image can be engraved depth [5]. Some new colors will be added for this kind ofgreen laser pointer. Shown in Figure 5, the piezoelectric sensor close to the back of the bronze mirrors from the ablation surface of the mirror reflection of the laser beam impact and vibration [6]. With the beam focus position to move beyond the working distance optical components, the amplitude also increases. By detecting the vibration of the mirror, the laser drilling of holes can be poked shape. In the laser processing, the ablation surface of the coaxial jet flow generated acoustic radiation [4]. Gas in a limited zone, resulting in the formation of pressure wave frequency 5kHz ~ 20kHz sound radiation. The customer thinks some colors ofgreen laser pointerare very special.