What are the advantages and disadvantages of green lasers?

June 17, 2024

Green lasers have become popular in recent years, and the technology has advanced by leaps and bounds. China has made great progress.


Although it has been very popular abroad, the awareness level of the domestic market is still very narrow. All semiconductor lasers are


generated by laser tube focusing. The difference between green light and red light is that there is no laser tube that directly emits green light. It


can only be converted by crystals and then expanded and collimated to produce well-focused green light.


The green light module is combined with a laser crystal and a nonlinear crystal. In the laser resonant cavity, the 808nm-wavelength LD pump


Light is used to generate a 1064 nm laser through the gain effect of the laser crystal, and then a 532 nm green laser can be generated through


the frequency doubling effect of the nonlinear crystal. The green light module is similar to an integrated circuit in an electronic component. It


has the characteristics of modularization and integration, can be mass-produced, and reduces costs. So let's talk about the advantages and


disadvantages of green lasers below?


1. What are the advantages and disadvantages of green lasers? Advantages of green lasers:


1. The energy density of the laser beam is high, and laser cladding can be completed as long as less energy is injected. The heat-affected


zone of the parts is small and the deformation is small, so it is suitable for repairing some high-precision parts or parts with strict deformation


requirements, such as fan rotor shafts, turbine rotor shafts, etc.


2. The dilution rate of the laser cladding layer is low and can be precisely controlled. The composition and performance of the cladding layer


mainly depend on the composition of the cladding material. Therefore, various materials with excellent performance can be used to modify the


surface of the substrate; in particular, laser cladding technology can be used to repair some workpieces that cannot be achieved by


conventional cladding processes, such as turbine engine blades, motor spindles, etc.


3. The laser cladding layer has a dense structure with few microscopic defects, and the cladding layer and the substrate are metallurgically


bonded and have high strength. Therefore, it can be used for surface strengthening and repair of parts under some heavy load conditions,


such as the repair of large roller flat heads, large gears, large crankshafts, and other parts.

2. What are the advantages and disadvantages of green lasers? Disadvantages of green lasers:


1. A green laser is different from an ordinary red laser. Its biggest feature is that it is less affected by external interference and has high


sensitivity. Its output brightness is much higher than that of a red laser, which is ten times or more than that of an ordinary red laser. Therefore,


its trajectory can be captured in the case of a dim light source, especially at night when the laser pen is pointed at the sky. You can see a bright


green light piercing the sky as long as you can see.


2. 532 nm wavelength: A pure green laser with a 532 nm wavelength is easier to distinguish than the previous red light. Whether it indicates


black and white or color patterns, it will not be mixed with the original image, and it will clearly highlight the key points you indicate.


3. The green laser module used in the green laser pen is much more expensive than the red laser module used in the red laser pen.


4. The technology used in the red laser module is relatively mature, and there are many manufacturers, so the price is relatively cheap. The


technology used in the green laser module has high requirements for materials. The price of materials is relatively expensive, and there are


relatively few manufacturers, so the cost is relatively high. This is also the reason why green laser pens are much more expensive than red


laser pens.

Green lasers have many characteristics: First, lasers are monochromatic, or single-frequency. Some lasers can generate lasers of different


frequencies at the same time, but these lasers are isolated from each other and are used separately. Second, lasers emit coherent light. The


characteristic of coherent light is that all its light waves are synchronized, and the entire beam of light is like a "wave train.". Third, lasers are


highly concentrated, which means that they have to travel a long distance before they disperse or converge.


Green lasers are lasers, so they are no different from other lasers, except that the colors are different because of the different wavelengths.