Some 1-watt green lasers are not true green diode lasers. Instead, they are created using a complex set of components capable of manipulating the wavelength of a laser and converting it into a green laser. For example, if an infrared laser is used and nonlinear crystals are used to increase the frequency but decrease the wavelength, the infrared laser pointer 1 watt can become a green laser, even though it is not really a green diode laser.Direct luminescence: So-called "true green" laser diodes, with a spectral range between 515 and 535 nm. It is made of indium gallium nitride (InGaN). By contrast, direct luminescent green lasers are easier to control, have greater temperature stability, are smaller, and have greater modulation capability at hundreds of megahertz.
Green laser is through the crystal infrared frequency multiplication, and the efficiency is very low, about 10%, so a 5 mw green laser infrared diode power can reach green laser pointer 1 watt and above, if you remove the frequency doubling crystal, does a lighted match, but the light path has been changed, the original infrared light can not be the focus lens group, Shine on is scattered and red light is a special red light emitting diode wavelength emission, which does not have the conversion of wavelength, the efficiency is relatively high two laser input power is about the same, but the conversion efficiency of green laser is too low, that is not line, the point match at least 1 watt.
