Haojun green laser pointer company was founded in 1992

The threshold current changes exponentially with temperature, in a certain temperature range, can expressed as a certain temperature range, Ith = I0 exp (T) T0 (3.9) where, I0 is a constant, T is the junction of the thermodynamic temperature, T0 is the laser equipment where a constant, thermodynamic temperature for the junction , the characteristics of material temperature modulation of the laser pulse, due to temperature rise caused by increased threshold current and external differential quantum efficiency decreases, increases and external differential quantum efficiency decreases, resulting in the output power characteristics of the diffraction grating of the refractive index cyclical changes, the light along the active layer distributed feedback of the changes so that the light along the active layer distributed feedback DFB laser requirements:That design is an improvement of directing at the defect of current laser circuit wafer of green laser pointer. the requirements of distributed feedback lasers: the requirements of (1) line width is more narrow spectrum narrower line width (2) high-speed pulse modulation to maintain the dynamic model of high-speed single-longitudinal-pulse modulation to maintain the dynamic model of a single longitudinal (3) more stable emission wavelength and emission wavelength can be tuned to achieve a more stable wavelength more stable and lower threshold current (4) a lower threshold current optical power (5) more output optical power output optical power greater Yanyan Yan Yan Yan Yan b P N layers with a layer of input output layer derivative (a) There are layers ∧ a (b) Figure 3.13 distributed feedback (DFB) laser? distributed feedback (DFB) laser?Haojun green laser pointer company was founded in 1992. (DFB) laser structure; (a) structure; (b) optical feedback as shown in Figure 3.13, the active layer emission of light, part of the anti-peak ripple in the grating as shown in the active layer emitted light, part of the anti-peak ripple in the grating as shown in the light emission peak grating corrugation grating peak ripple counter, such as light a) a), the other part continues to forward propagation, the peak in the vicinity of the grating wave radiation (such as lighting a), the other part continues to move forward propagation, the peak in the vicinity of the grating ripple counter, such as light b) b). Radiation (such as light b). Grating period for the effective refractive index material, for the Bragg lattice wave length, is the diffraction order. ne is the effective refractive index material, λB for the Bragg lattice wave length, m is the diffraction order.This company has years of experience in making green laser pointer. In the ordinary grating DFB lasers in the laser oscillation occurs there are two minimum threshold, the laser oscillation threshold of a minimum of two ordinary grating in DFB lasers, laser oscillation occurs in the lowest two thresholds, DFB lasers, gain the same longitudinal mode longitudinal mode, gain the same longitudinal mode, the wavelength of the laser and FP laser compared with the following advantages: Lasers and laser compared to F, has the following advantages Advantages: laser and? easy to form a single longitudinal mode oscillation; ① easy to form a single longitudinal mode oscillation; narrow spectral lines, the direction of the line is good; ② narrow spectral lines, the direction of the line is good; high-speed modulation, dynamic line broadening is small, single-mode stability; This company grasps all kinds of superior difficult green laser pointer making techniques.③ high-speed modulation dynamic spectra broadening is very small, single-mode stability; output linearity. ④ Output linearity. LD characteristics and application characteristics: high efficiency, small size, light weight, simple structure, suitable for aircraft, ships, features: high efficiency, small size, light weight, simple structure, suitable for aircraft, ships, tanks and infantry on the application carry, such as on an airplane for the range finder to target enemy.