The 650nm laser uses a 808nm infrared laser diode as the pump source, which is converted into 1064nm infrared light by a Nd:YVO4 laser crystal, and then is frequency doubled by a KTP frequency doubling crystal (wavelength halved) to obtain a 523nm green laser, but generally not on the laser crystal It is coated with infrared filter film, so the light directly coming out of the crystal is actually mixed light (532nm green light, 808nm infrared light, 1064nm infrared light three wavelength mixed light), if you directly measure the power, the power value obtained is the mixed light The power of the light, and the power of the 650nm green laser is the power of pure green light. Green light is only a part of the mixed light, so the total power of the mixed light is greater than that of the green light.
The hazards and protection of far-infrared Laser pointer: The commonly used carbon dioxide lasers (10.6µm) are all absorbed by the cornea and cannot enter the eyes. Because this laser is invisible and generally powerful, it will burn the cornea, conjunctiva and eyelids if you are not careful. For corneal burns, the lightest is a small white cloud point, which appears 10 minutes after irradiation, and only involves the corneal epithelium, no edema, subsides, no visible scars, the heavier is the formation of cylindrical white spots from the outside to the inside, and the heaviest is The formation of ulcerated spots or perforations. Although powerful, the protection is quite simple. You only need to wear a pair of flat glass glasses. The threshold of carbon dioxide laser is 0.1W/cm2.
The carbon dioxide laser will absorb 0.2mm thick skin, which can easily cause blisters or scorching. When the power is high, it will burn all at once, and the physiological response (such as pain) will not be able to protect it. The laterally excited barometric carbon dioxide laser can ionize the air. If 30mJ of carbon dioxide is used to irradiate the skin on the forearm surface for 0.5 to 0.25s, the diameter of the spot is 10 µm, which will cause tingling and burning pain during irradiation. Erythema appeared a few hours later, expanded after 24 hours, edema, and finally scarred. Protective measures: Wear work clothes and gloves.