The internally installed laser module improves the heat abstractor of green laser pointer

As can be seen from Figure 3, parallel to the junction plane cavity width w by the narrow width, can be seen from Figure 3.8, parallel to the junction plane cavity width w by the narrow width, the field map showing the multi-transverse mode into a single transverse mode; perpendicular to the junction plane resonator thickness t shown by the multi-field maps into a single transverse mode transverse mode; thin, the direction of the field maps is always a single transverse mode. Thin, the direction of the field maps is always a single transverse mode.That prolongs the useful time of green laser pointer. Laser bar near field and far-field pattern GaAlAs-DH laser bar near field and far-field pattern typical of semiconductor lasers for the far-field radiation, the figure θ Figure 3.9 A typical semiconductor lasers for the far-field radiation, the figure  were parallel to the junction plane and perpendicular to the junction plane of the radiation angle, leaving the entire beam cross section oval. Plane perpendicular to the junction plane and the radiation angle, leaving the entire beam cross section oval. A typical semiconductor laser far-field and far-field radiation pattern (a) the angular distribution of light intensity, (b) the radiation beam of light conversion efficiency and output power characteristics? 3 optical power conversion efficiency and output power characteristics of laser / optical conversion efficiency Power efficiency and quantum efficiency can be expressed.LM-2012 green laser pointer could work for more than 8000 hours. Laser electrical / optical conversion efficiency of power efficiency and quantum efficiency can be expressed. Quantum efficiency is further divided into internal quantum efficiency, external quantum efficiency and external differential quantum efficiency. As the internal quantum efficiency, external quantum efficiency and external differential quantum efficiency. External quantum efficiency of: external quantum efficiency: the number of laser photons emitted per second is defined as above the threshold current for each of the composite carrier the number of photons produced outside the differential quantum efficiency ηd defined as above the threshold current, Each of the composite carrier generation of photon number where, respectively, the laser output optical power and drive current, where, P and I are the laser output optical power and drive current, Pth and Ith are the corresponding threshold threshold, hf, respectively photon energy and electron charge. The internally installed laser module improves the heat abstractor of green laser pointer.And e are the photon energy and the electron charge. Semiconductor lasers are very sensitive to temperature, the output power will change significantly with temperature, semiconductor lasers are very sensitive to temperature, the output power will change significantly with temperature, mainly due to: the threshold current of laser threshold current I increasing temperature (at higher external differential quantum efficiency to be increased due to: (1) laser threshold current Ith increases with increasing temperature (2) external differential quantum efficiency decreases with temperature. reduce the rate of increase and decreases with increasing temperature ηd Temperature rises, Ith increases, ηd decreases, the output optical power decreased, reaching a certain temperature, increases, decreases,LM-2012 green laser pointer adopts the circuit wafer collector protective design. the output optical power decreased , reaches a certain temperature, the temperature rises, no longer stimulated emission of the laser when driven with DC current when the laser threshold current with temperature no longer stimulated emission of a laser when the laser drive current when the DC, change is more serious when the laser pulse modulation, the threshold current changes exponentially with temperature, change is more serious when the laser pulse modulation.