More actions should be taken to enhance quality of green laser pointer

More measurements should be carried out for green laser pointer 
Very short pulse width, up to femtoseconds (10-15 seconds), the shortest pulse is shorter than the use of e-learning methods, thousands of times, is the only technical means of the shortest pulse obtained under laboratory conditions of the current human . Amplified to high peak power up to terawatts (1012W), by focusing, the peak power density of up to 1018 ~ 1020 W / cm2 intensity than the Coulomb field of the atoms inside. High-power femtosecond laser system consists of four parts: oscillator, stretcher, amplifiers and compressors. Within the oscillator, using a special technique of femtosecond laser pulses. The stretcher will be opened by the femtosecond seed pulses of different wavelengths in time. Amplifier so that the broadening of the pulse to be fully energy. More actions should be taken to enhance quality of green laser pointer 
Simulation compared with the lead and lag control method. The results show that the closed-loop bandwidth of the coarse tracking servo unit, the resonant peak and resonant frequency similar to the premise fuzzy adaptive PID platform for low-frequency disturbance rejection is better than lead and lag control method. Coarse tracking servo unit system structure. The two-axis turntable spindle actuator, the pitch axis and azimuth axis with speed - the location of pairs of closed-loop control, the position loop optical encoder for position feedback, the speed of information through the calculated difference of the optical encoder information, because the differential operator on the noise-sensitive , so the difference before the need for simple filtering. Single-axis control system block diagram shown in Figure 1. The green green laser pointer is easy to be affected by the ambient temperature.
After using the inhibition of lead and lag and fuzzy adaptive PID method for coarse tracking servo unit of the system error, power spectrum, respectively, as shown. For the perturbation of the platform 1, the fuzzy adaptive PID Disturbance Rejection in the range [-100dB,-200dB], lead and lag method is disturbance rejection in the range [-80dB,-150dB]. For the perturbation of the platform 2, the fuzzy adaptive PID Disturbance Rejection in the range [-80dB,-160dB], lead and lag method is disturbance rejection in the range [-65dB,-140dB]. Low frequency component peak error in the time-domain diagram from the point of view, lead and lag methods 1mrad fuzzy adaptive PID difference of nearly 10 times.