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However, high power pulsed laser and material effect, the shielding effect of the surface plasma on the laser ablation effect and negative affect. Laser damage threshold of the thermal ablation of the material can be described with the energy density threshold, the available power density threshold description. In the case of rectangular short pulse laser energy density threshold for a given material damage is a constant power density threshold and pulse width is inversely proportional; in the case of long rectangle pulse, the laser damage to the material given energy density threshold value and the pulse width is proportional to the square root of power density threshold and pulse width is inversely proportional to the square root. Users want to highlight some key points with help of china laser pointer.
In other words, short laser pulses mainly rely on to achieve the power density threshold the material ablation destruction, long-pulse laser energy density threshold depends mainly on the reach ablative destruction of the material. Different material and material of the laser absorption and reflection of the same physical concepts that reflect this ability is the absorption coefficient and reflection coefficient of the material on the laser. According to the law of conservation of energy, the laser can not penetrate the material reflection coefficient and the absorption coefficient of 100%. Undermine the ability of laser ablation on thermal, laser and the material is inversely proportional to the reflection coefficient, the absorption coefficient is proportional to the laser and the material. The laser ray color of china laser pointer can be chosen by the customer according to the need.
The same melting point of the two materials, when the laser power is small, the thermal conductivity coefficient of the material Shaorong time was needed, smaller thermal conductivity of the material Shaorong takes less time; with the incident laser power time gradually increased, the materials under the action of the laser thermal conductivity, a gradual reduction of the two materials is Shaorong required to gradually close; when the radiation laser power is large enough, the material is too late in the laser induced heat conduction, two The material is Shaorong time required to reach consensus. If the appropriate material parameters and the parameters of the laser pulse in surface gasification, there may be material deep temperature is higher than the surface temperature, when the material internal thermal overload, high temperature and then generates a high voltage. The client wanna stand some important contents out with china laser pointer.
Thermal explosion occurs when the threshold is reached, thereby increasing the destruction efficiency of laser perforation. Thermal ablation effect of damage on the vehicle. Thermal ablation effect of the high-energy laser weapons, the destruction of missiles, aircraft, satellites, aircraft performance for direct ablation, damage, structural and mechanical destruction of the destruction of the optoelectronic devices. Alloy materials, missiles, aircraft, satellite housing are generally the melting point of about 1500 ° C as long as the power 2 to 3MW of pulse high-energy laser irradiation in a fixed position of the shell surface 3 ~ 5s easily ablation melting or gasification, to target the internal fuel combustion, explosion or component damage were destroyed. This destruction is known as the direct ablation of destruction. china laser pointer can thoroughly liberate users from the restriction.
When the irradiation of the laser power is low, the laser energy absorbed by the target so that the local temperature of the surface increases, but below the melting point, then, although it can not Shaorong materials, but can change the physical and mechanical properties of materials, such as making yield strength, tensile strength decreased. This phenomenon is called the softening effect. In fact, even the power of the laser target, the target is in the melt before the softening effect who were destroyed. Therefore, laser weapons are not necessarily bent on missiles, aircraft, satellite shell surface burn hole to in order to damage the target, while the softening effect caused by the shell material tensile compressive strength decreased, so that the stress in their own were destroyed in the role. green laser pointer can meet the needs of the time.