For these types of integrated laser diodes, everything takes place inside the chip 700mW laserpen groen . Therefore, the output wavelength is fixed and determined by the properties of the semiconductor material and the device's physical structure. Or, at least that's the way it is supposed to work though with some, reflection of the laser light back into the chip can cause stability problems or even be used to advantage to frequency stabilize the output. There are also tunable diode lasers using external cavity optics to provide a continuous and in some cases, quite wide range of wavelengths without mode hopping. See EOSI's Tunable Laser Diode Systemsfor an example of one commercially available product. You really don't want to ask about the price! :-)

With analog modulation, the output intensity should be related to input voltage between limits. For example, a 0 to 1 V signal may result in an output between that varies between 1 and 10 mW. The limits may be adjustable (gain and offset 200mw laser pointer blauw-violet ). A maximum modulation frequency may be specified but unless the datasheet explicitly lists what this means, it could be at the 3dB point, some other reduction in output amplitude, where the output can no longer swing fully on and fully off, or something else. Where the input is AC coupled, there will also be a lower limit greater than DC/CW.

I have a few laser pens here that go nuts when you aim them at a mirror. With some pointers the mirror has to be precisely aligned much the same as the mirrors at the ends of the laser cavity itself. With others the alignment isn't as critical. These same pens seem to be unaffected by other light sources shining back into the laser including light from another laser pen with the same approximate wavelength.

The same basic comments apply to boosting the output power of expensive green laser pointers (but of course there is much more to lose). The adjustment may vary current or for those that are pulsed (which are most of them), the duty cycle instead. With no thermal management, stability is likely to be significantly worse at higher power even if the laser diode survives. However, since 3 mW and 5 mW pointers may be physically identical inside and out 2000mW laserpen blauw , I don't know whether they are sorted on the basis of power output before labeling or is just a matter of the setting of the power adjust pot - it probably depends on manufacturer/model.