## 1 Introduction  
Carbon fiber reinforced polymers (CFRP) are a new material with high strength and corrosion resistance. They are favored by aviation and automobile manufacturing companies because of their good mechanical properties and light weight. However, it is difficult to cut and drill them by traditional mechanical processing methods, and problems such as material delamination and burrs are prone to occur when processing CFRP, which seriously restricts the wide application of CFRP [1]. As a non-contact advanced processing technology, laser processing technology has great application potentials in CFRP processing [2]. However, due to the sensitivity of the resin matrix to heat input, and the huge difference in the thermodynamic properties of carbon fiber and resin, etc., it is very easy to produce a heat affected zone (HAZ) when laser processing CFRP [3]. The presence of a heat affected zone seriously affects the static strength of CFRP [4]. At the same time, due to the characteristics of the Gaussian beam, laser drilling is prone to tapering, which is more obvious when drilling deep holes [5]. Laminates are increasingly utilized in the aerospace and engineering fields for their high stiffness, high strength, and low weight. In recent years, much research on laser processing of composite materials has been conducted [6]. The surface treatment of fiber can significantly improve the properties of the fiber-matrix interface, thus improving the properties of composite materials [7; 8; 9]. During the processing, carbon floc and fiber burr always occur due to the thermodynamics damage [10; 11; 12]. As a result, the mechanism research focusing on laser interact with CFRP is an urgent issue which needs to be studied for the processing industry. The structure of CFRP material normally takes the layered braided structural [13]. Carbon fiber has relatively high thermal conductivity along the axis of symmetry, which is 10 times higher than carbon fiber perpendicular to the axis of symmetry and about 200 times higher than the matrix material [14]. Thermal damage is a direct result of the large difference in thermal properties between carbon fiber and epoxy matrix [15; 16; 17; 18]. In fact, as a matrix, the polymers show a low absorptivity at the wavelengthrange of about 1\(\upmu\)m [18; 19]. In addition, the energy required to vaporize or sublimate the carbon fiber is more than one order of magnitude higher than the matrix [20]. [PERSON] et al. simulated the width of the upper and lower cut, and the mass transfer and energy transfer of the laser cut CFRP [21]. [PERSON] and others used a numerical finite difference heat flow model to predict and analyze the shape and size of the punch hole under given laser conditions [22]. Their simulation results are in good agreement with the experimental results. [PERSON] et al. studied a model of laser interaction with CFRP. The absorption rate, absorption depth, angle of reflected light, and the enhancement of light energy in the material were determined by ray tracing model [23]. At the same time, the macro model is used to study the overall damage effect. The results show that the ray tracing model plays a decisive role in the parameters of the two models. In the above research, the macro phenomena of laser processing of 3D CFRP are the main, and there is no much attention to the temperature rise details of laser target. In order to study the temperature rise of the CFRP irradiated by laser, we aimed to gain insight into the mechanism of the morphology performance when long pulse laser interacts with CFRP composites. Our analysis is based on the anisotropic properties, while modeling, simulation, and the experimental comparison are discussed as follows:  
1. The ablation of CFRP laminates under different laser conditions was carried out. The simulation results show the elliptical morphology which agrees with the experimental finding. The HAZ and depth of composites behave differently by various parameters such as laser pulse number and fluence. 2.