The output power of green laser pointer should not more than 5mW

Tunable laser technology from the implementation point of view is divided into: current control, temperature control and mechanical control technology type. Electronic control technology which is achieved by changing the injection current wavelength tuning with ns-class tuning speed, wide tuning bandwidth, but the output power of small, electronic control technology based on the main SG-DBR (sample grating DBR) and GCSR ( sampled grating assisted directional coupler back-reflection) lasers. Temperature control is by changing the refractive index of the laser active region, thus changing the laser output wavelength. The technique is simple, but slow, adjustable bandwidth is narrow, only a few nm. Mainly based on temperature control of the DFB (distributed feedback) and DBR (sub-bubu Bragg reflector) laser. The parameter of green laser pointer has been provided to the customer.
Mechanical control is mainly based on MEMS (microelectromechanical systems) technology to complete the choice of wavelength, with a large tunable bandwidth, high output power. Mechanical control technology based on the main DFB (distributed feedback), ECL (external cavity lasers) and VCSEL (vertical cavity surface emitting laser) structure. The following aspects from the principle of a tunable laser is described. Current control technique based on the general principles of tunable laser by changing the different locations within the fiber grating and phase control section current, so that the fiber grating will change the relative refractive index, resulting in different spectra, generated by different regions of the FBG superposition of different spectra for the choice of a particular wavelength, resulting in need of a specific wavelength of the laser. The customer is asking for the revised parameter of green laser pointer.
Current control technique based on tunable lasers SGDBR (Sampled Grating Distributed Bragg Reflector) structure. The type of semiconductor laser is divided into the enlarged area, the first Bragg grating area, active area, after the phase adjustment region and Bragg grating area. Which the first Bragg grating region, the phase adjustment region and the region after Bragg gratings were to change by different current distribution of the molecular structure of the region, thus changing the Bragg grating period features. For the active region (Active) generated spectra, respectively, the first Bragg grating area and region after the formation of Bragg gratings with small differences in the frequency distribution of the spectrum. For the needs of specific wavelength lasers, tunable lasers, respectively before and after the Bragg grating to impose a different Bragg grating current, so in these two regions have only this particular wavelength does not overlap other wavelengths of spectral overlap, so that the need specific wavelength to output. With. The customer is requiring the result of inspecting parameter of green laser pointer.
When this type of laser also include semiconductor amplifier section, the output of a specific wavelength of laser light power of 100mW or 20mW. Commonly used mechanical control technology based on MEMS to achieve. Mechanical control techniques based on tunable laser using MEMs-DFB structure. Tunable lasers including DFB laser array, MEMs can tilt the lens and other control and auxiliary parts. For the DFB laser array area there are several DFB laser arrays, each array can be generated within a bandwidth of about 1.0nm specific wavelength interval of 25Ghz. MEMs by controlling the rotation angle of the lens need to choose a specific wavelength, so the output needs of specific wavelengths of light. The user has got the permission to check the parameter of green laser pointer.
Another series based on VCSEL structure ML series of tunable lasers, and its design is based on optically pumped vertical-cavity surface-emitting lasers, semi-symmetrical cavity technology, the use of MEMS to achieve continuous wavelength tuning. This method is also available through a large optical output power and wide spectral tuning range, the thermistor and TEC packages together so that a wide temperature range in a stable output. In order to accurately control the frequency of a broadband wavelength controller is integrated the same tube shell, front-tap optical power detector and the optical isolator is used to provide a stable output power. This C-band tunable lasers can provide 10/20mW and L-band optical power. The user needs more information to confirm the accuracy of the parameter of green laser pointer.