The manufacturer can cut the cost of making green laser pointer

A broadband wavelength controller integrated the same tube shell for precision frequency control, front-end sub-access optical power detector and the optical isolator is used to provide a stable output power. This tunable lasers in the C-band and L-band 10/20mW optical power. The main disadvantage of this principle of tunable lasers is the tuning time is relatively slow, it normally takes a few seconds time of tuning stability. Based on temperature control technology. Temperature-based control technology applications in the DFB structure, its principle is to adjust the laser cavity temperature, which can make it launch different wavelengths. Based on the technology of the principle of the tunable laser wavelength adjustment is to rely on to achieve control of InGaAsP DFB lasers work in -5 - 50 ° C change in. All customers want to buy green laser pointer of the best quality and performance at the lowest price.
The module is built-in FP etalon and optical power detection, and continuous light output of the laser can be locked in the ITU rules 50GHz interval grid. The module has two separate TEC, one used to control the wavelength of the laser, and the other is used to ensure that the wavelength locking module and power detection probe thermostat work. The module is also built-in SOA to amplify the output optical power. The disadvantage of this control technology is the tuning of a single module width is not wide, generally only a few nm, and the tuning time, it normally takes a few seconds time of tuning stability. Tunable lasers essentially current control, temperature control technology, or mechanical control techniques, some suppliers may be one or both of these technologies. The purchase plan can be performed based on the sales plan of green laser pointer .
Of course, as technology evolves, there will be other new tunable laser control technology. A variety of tunable lasers. In Figure 1, Figure 2 shows typical dye laser structure diagram and several dyes typical tuning range. Figure 1 using of Nd: YAG laser after frequency doubling after 5320 angstrom laser as the pump source to motivate dye. Constitute a resonator in the oscillator part of the fringe spacing d of the diffraction grating and output mirror. At this time, only the wavelength to meet 2dcosθ = mλ, m = 0,1,2, ... beam that has a low loss, and can form the laser oscillation. Therefore, the rotating grating (to change the angle θ), we can change the wavelength of the laser output. Therefore, the customer can use green laser pointer to point at the star in the sky.
Etalon in the cavity insert placed in a pressure chamber. Change the air pressure in the pressure chamber, the gas can etalon refractive index change accordingly, thus fine tuning the output wavelength. Figure there is a zoom to increase the output laser power. General the structure of the dye laser is simple, inexpensive, and relatively high output power and conversion efficiency. The structure of the ring dye laser is more complicated, but superior performance, and can output a stable single longitudinal mode laser. The dye laser tuning range of 0.3 to 1.2 microns, is the most widely tunable lasers. Chrysoberyl laser. A solid-state tunable lasers. The chrysoberyl Cr3 + in the energy levels shown in Figure 3. The power of red green laser pointer  can be adjusted through rotating laser pointer   head.