CO2 laser marking machine laser working principle
CO2 lasers are commonly used molecular gas lasers, and they are also widely used in gas lasers. CO2 lasers use CO2, N2 and He The mixed gas is the working substance. Laser transitions occur between two vibrational-rotational energy levels in the electronic ground state of the CO2 molecule. The role of N2 is to improve the excitation efficiency of the upper energy level of the laser, and He contributes to the evacuation of the lower energy level of the laser. The CO2 laser emits invisible laser light with wavelengths of 10.6um and 9.6um. The laser can work either continuously or in pulses. Its output power and energy are large, and its high efficiency can reach 15%~25%. The continuous output power of its commercial devices can reach the order of 10,000 watts. CO2 laser has been widely used in drilling, cutting, welding and heat treatment in industry, and it is an ideal laser in industrial applications.
Like other molecular lasers, the working principle of CO2 lasers, that is, the stimulated emission process, is also complicated. Molecules have three different motions:
1 the movement of electrons in the molecule, which determines the electronic energy state of the molecule;
2 the principle vibration in the molecule, that is, the atoms in the molecule surround Its equilibrium position constantly vibrates periodically—it determines the vibrational energy state of the molecule;
3 The molecule rotates, that is, the molecule rotates continuously in space as a whole, and this motion of the molecule determines the The rotational energy state of the molecule; the CO2 molecule is a linearly symmetric molecule with two oxygen atoms on either side of the carbon atom. The atoms of the molecule are always in motion, constantly vibrating away from their equilibrium positions. According to the molecular vibration theory,
CO2 has three different vibration modes;
1 The two oxygen atoms vibrate in opposite directions along the molecular axis, that is, the two oxygen atoms reach the The Z maximum value and equilibrium value of the vibration, and the carbon atom in this time is stationary, so its vibration is called symmetrical vibration;
2 The two oxygen atoms vibrate in the direction perpendicular to the molecular axis, and The vibration direction is the same, while the carbon atoms vibrate in the opposite direction perpendicular to the molecular axis. Since the vibrations of the three atoms are synchronized, it is also called deformation vibration;
3 The three atoms vibrate along the symmetry axis, The vibration direction of the carbon atom is opposite to that of the two oxygen atoms, which is also called antisymmetric vibration. In these three different vibration modes, different groups of energy levels are identified.
Generally speaking, it should not be used in the following situations: 1. The laser marking machine should not be used when the voltage is not stable and there are large fluctuations; 2. The laser marking machine should not be used for a long time in an alkaline environment; 3. Keep away from the transmission equipment that seriously affects the signal of the laser marking machine, such as strong electricity and strong magnetism; 4. It is not suitable to use the laser marking machine in the environment with two-core power supply. The power supply of the laser marking machine should use a three-core power supply. 5. Common problems: '5S' serious environment, circuit crossing, garbage blockage, etc., may affect the normal operation of the equipment.
For more relevant CO2 laser marking machine knowledge, please pay attention to the home page of the laser official website: http://www.
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