Stick back reflection pump may cause very high peak power. This peak power may destroy the internal optical components and fiber optic cables. Back-reflection amount of fiber length, fiber core diameter and a function of laser power (fiber the longer, the smaller the core, the higher the power, the greater the back reflection). , Small size, because YAG disc lasers, the lasing generated by the back-reflected energy can be ignored, so the fiber length is no longer limited by this phenomenon. Disk lasers (diode-pumped rod lasers as well) the last one of the advantages it is worth noting: the pumped disk of light from the diode laser. Normally, when the customer buy this kind ofgreen laser pointer, the manufacturer will ship the complete set of laser pointer for the handy and convenient use of the customer.
With light (such as arc lamp) pump laser compared, the advantage of particularly prominent. The difference between them is: diode lasers have a very narrow wavelength range (almost all the light energy of laser), while the light in the wavelength range is very wide, useless most of the laser, but produce no heat used. This is a laser disc electro-optical efficiency greater than 15% of the basic reasons, typical lamp-pumped lasers, electro-optical efficiency of only 3% to 4% (diode-pumped rod lasers electro-optical efficiency of about 10%). Beam quality advantages. Turning to the beam focusing capability and laser power density on the workpiece, the beam quality becomes very important. The brass material can makegreen laser pointerharder and more endurable.
However, the beam must be focused into the fiber, the beam quality is the most important factor in determining the fiber size of the transmission beam. Beam quality, sometimes also known as the beam parameter product BPP is the plot of the beam radius and beam divergence angle, mm - mrad expression. On the beam is focused into the fiber, the beam radius is the radius of a focused laser beam in the fiber at the entrance beam semi-divergence angle is equal to the half-width of the coupling beam. In order to produce a more stable laser device in the fiber at the entrance of the focused spot must be less than the fiber core diameter to be small enough to be plug and play replacement of fiber (to replace the fiber optic cable in the field, without any ability to adjust). The rubber finish can increase the friction between the hand of the customer and the body of green laser pointer.
Core diameter (φc) and the focused spot on the workpiece (d) the direct relationship, and also the power density, this relationship can be expressed as: where, f is the focal length of the focusing optical system, fc is the collimating optics The focal length of the system. Therefore, the smaller the core diameter, the smaller the diameter of the focused spot. However, the light is not enough to have the ability to focus into a small spot. Also consider the problem of power density. The power density (Pd) means: the unit focused spot size of laser power (P) (area = πd2 / 4). So, when the diode-pumped disk laser (Trumpf, Model HLD is 4002, the power up to 4 kW on the workpiece. The goggle ofgreen laser pointercan prevent the customer being hurt by the strong and powerful laser beam light of the laser pointer.
Diameter fiber is 200μm) with the lamp-pumped rod laser (Trumpf, the model of HL 4006, power up to 4 kW on the workpiece, the diameter of the fiber is 600μm) spot size and power density, the superiority of the beam quality, to be passed by the power density or the focal length be seen clearly. Higher power density can be used to generate high-speed, narrow weld, or by using a long focal length lens, resulting in a low-speed, wide weld. Compared to the benefits of using a long focal length lens with short focal length lens is: it makes the processing of optical components away from the welding fumes and spatter, but also created a much greater depth of focus (or larger processing window). Actually, this kind of multiple function charger of green laser pointer is very convenient for the customer.
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