Although very powerful Laser pointer types are used in medical work, chemical laboratories and technological development, there are other types. The popular type of laser is the laser pointer. Laser pointers are designed for public use, and their functions are far less than those used in professional environments. For professional lasers, many variants can be used according to specific needs. Lasers can be classified as gas, liquid or solid lasers. In a gas laser, the medium consists of a gas or vapor or a combination of multiple gases. In liquid lasers, dyes are usually used as the medium. Solid-state lasers use media such as crystal or glass.
The polarization of laser diodes is also a well-known problem. The thermal or mechanical stress on the laser engraver and the back reflection of the glossy sample and optical components on the optical path can cause the polarization of the laser diode to rotate slightly. Whether using a polarizer or a polarization-dependent corner mirror on the optical path, this change in the polarization direction will become a power fluctuation at the sample. To overcome this problem, Integrated Optics installs a polarization cube in each diode laser and samples the optical power after the polarization cube. In optical devices with polarization-related components, many customers have realized the benefits of unprecedented polarization contrast (over 1000:1) and excellent power stability.
Another topic is the stabilization of VBG stabilized diode lasers or general external cavity diode lasers (ECDL). Most VBG stabilized lasers provided by single-frequency laser manufacturers do not have an optical feedback loop. In fact, it is much easier to ensure that the SLM runs in the ACC operating mode. But the main problem is to ensure power repeatability between on/off cycles. Integrated Optics has taken a step further, providing SLM lasers operating in APC mode while maintaining good long-term stability and stable spectral performance.
One might argue that newly purchased laser pointers do not pose an occupational or consumer risk like earlier blue laser pointer, because the wavelength has shifted from the "raw" 670 nm (dark red) to the "new" 635 nm. ("Bright" orange-red). [Figure 1 illustrates this fact] In this case, the older 670 nm indicator usually emits 3 to 5 mW of radiation power (Class IIIA), while the new 635 nm indicator usually emits less than 1.0 mW (II Class) radiated power. Is considered "brighter". The conclusion is that, due to the low power rating, if the 635 nm pointer is pointed at someone’s eye, it will not cause much concern.