Direct luminescence: So-called "true green" cats to play with laser Pointers 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. In the synchronous pumping mechanism, because the pump light is in pulse form, in order to achieve resonance enhancement, a crucial match is needed, that is, the length of the Raman cavity matches the pulse with the pump repetition frequency. Only when this matching is achieved can the Raman pulses generated in the cavity overlap with the pumped pulses to gain and reduce the width of the pulse each time it is transmitted in the cavity. The matching may be that the Raman pulse is fired once in the cavity at the same interval as the pumped pulse, i.e. there is only one fundamental frequency of the Raman pulse in the cavity, or the Raman pulse is fired in the cavity.
The 445nm ~ 447nm high power cats to play with laser Pointers diode technology is mature, the cost is relatively low, so there are a large number of high power blue laser on the market. And the price goes down year by year. Since 2017, the latest 520nm green 1000MW laser technology has developed rapidly, many sellers 520nm 1000MW green pointer cats to play with laser Pointers, like green partners can pay attention to; But 1000MW red light technology is difficult, the price is relatively high; 1000MW red laser beam Compared to 1000MW green laser beam, the green laser is much lighter than the red laser.
Existing small green laser competition mainly in the form of frequency doubling diode pumped solid state (DPSS) lasers, usually in the first green laser designator. These lasers are relatively complex, including infrared pumped laser diodes used to pump solid-state lasers and nonlinear optical crystals used to double the frequency of the infrared light obtained to the green laser pointer. In contrast, a direct laser diode consists of only one direct laser diode.
