laser pointer is very important in business contact and so on

laser pointer is very important in business contact and so on.
First, the history of quantum amplification in the microwave band (1953), 1954 - CH Townes, IP Gorden, HJ Zeiger achieved using NH3 molecular beam Maser grow to more short hair - ammonia beam maser, 1958- AL Schawlow, CH Townes, AM PoxopoB Maser principle extended to the proposed light band - laser, 1960 - TH Maiman of Bell Lab Ruby for the first time laser l = 6943? red (early name: les, quantum oscillator, lasing light device by the laser, "Laser" - Qian put forward in 1963 61 years of China (Asia), the first laser was born in Changchun (Changchun Institute of Optics and optical machines College), by Wang Jiang Yuanshi invention. Cavity light field can be calculated by Kirchhoff diffraction by the mirror M1 on the field distribution in the cavity caused by the wave obtained. Optical cavity is the cavity field is propagating along a traveling wave through the mirror part. Wave function is multiplied by the specular transmittance t. As already described begin to speak of the physical model concept, the first review since the integral equation model to reproduce the physical meaning of the concept of the establishment of the laser mode. Re-formed and began to solve the self-reproduction of symmetric integral equation model to understand the specific output of the laser field distribution. Green ray laser pointer are the most competitive products.This section discusses the use of Q-width of the laser pulse compression techniques for high-power pulse method. In order to be more narrow pulse, mode-locking can also use special technology to laser beam modulation, the beam in different vertical oscillation of the mold has a definite phase relationship, so that the coherent superposition of each model ultrashort pulse. Mode-locked laser pulse width of up to 10-11 ~ 10-14s, the corresponding high peak power. This section also works as a mode-locked laser brief. The basic principle of Q-switched laser: a way through to the cavity loss value changes in accordance with the prescribed procedures, thus reducing the optical pulse width, peak power output greatly increased. This kind of laser pointer can be used as a commanding pen.Q-basic process: beginning at the pump, so that the cavity loss increases, Q values decrease, then the device becomes higher oscillation threshold, the oscillation can not be formed, on the level density inversion may have accumulated a large number of When accumulated to a maximum value (saturation value), the sudden loss of the smaller cavity, Q sudden increase in value, when the device suddenly goes low oscillation threshold, the rapid establishment of the laser oscillation, the same cavity as a very high avalanche establish a strong oscillation speed in a short time a large number of inversion is consumed, the light energy into a cavity, while the output of a strong laser pulse. Mode-locked laser is a further special modulation.