China laser pointer is advanced with IF technology adopted

For the dissemination of research from the laser resonator, to the size and distribution of the beam intensity and phase in the cavity, which is laid a foundation for the laser output characteristics. One of the main difference between laser as the light source and light is the laser cavity, the cavity doubled laser gain medium by stimulated amplification length to form a light high-brightness light source directivity. Actually the third important feature of the laser - a high degree of coherence is determined by the resonant cavity. The presence of discrete oscillation modes in the cavity due to the laser resonator, greatly improving the monochromaticity of the output laser to change the output laser beam structure and its transmission characteristics. The memory function of china laser pointer is optional.
This chapter laser output from the cavity of the diffraction theory of Gaussian beam, the laser output power and linewidth of the laser output limit. 2.1 in the optical resonator diffraction theory, geometrical optics analysis discussed the propagation of light in the cavity, the classification of the stability problem of the resonator and the resonator. Cavity oscillation modes exist, the pattern of the various modes of the beam structure and its transmission characteristics, diffraction loss, only the physical optics method. Optical resonant cavity mode theory is in fact in the theory of scalar Fresnel - Kirchhoff diffraction integral, as well as on the basis of the concept of mode of reproduction, the section in this way to discuss the optical resonator. china laser pointer is advanced with IF technology adopted.   Fresnel - Kirchhoff diffraction formula of Huygens in order to describe the wave propagation process, the concept of the wavelet, that each point of the wave surface can be regarded as a sub-ball face the next time a new wave of the wave source before the shape is determined by the sub-sub-wave envelope surface. Fresnel introduction of the concept of interference, supplemented Huygens' principle, that the child Boyuan hair wave is coherent, spatial light field is the result of superposition of each sub-wave interference. Kirchhoff further Green's function method to solve the wave equation, the mathematical form of the Huygens-Fresnel principle is the Fresnel - Kirchhoff diffraction formula (3-1), its significance as shown in Figure (3 -1) as shown. By (3-1) can be seen that the wave surface on Σ a secondary wavelet is a "non-uniform spherical wave. The minute users insert them into the computer cases, green laser pointer can automatically run.
The factor e-ik of ρ ρ is that the waves are spherical waves, the factor 1 + cos of θ is called inclination factor, which reflects the wavelets of this spherical wave is "non-uniform". 3.1.2 optical resonator self-reproduction mode integral equation. Reproduction mode the concept of the optical resonator is an "open" resonator. The so-called open means that it rely on both ends of the reflector to achieve the round-trip propagation of the beam in the cavity, no other restrictions for light waves. Due to the limited size of the reflector, while the beam from the reflection, but also caused by the diffraction effect. Part of the cavity of each beam after the role of the mirror, the beam can not again be reflected back into the cavity. The specific requirement ofchina laser pointerwill be included in the instruction.
Thus, the intensity of the reflected beam to weaken, the light intensity distribution will also change. 1960 Fox, AG and Tingye Li computer iterative method numerical calculations prove that when the reflection times is enough for a long time (about 300 reflection), the transverse field distribution of the beam will be stabilized and no longer subject to the impact of diffraction. Field distribution in the cavity round-trip propagation time to be able to "reproduce", reflected only change the intensity of light size, without changing the light intensity distribution. The steady-state field after one round-trip, the only change is the mirror field amplitude attenuation by the same proportion of the phase lag of the same size. china laser pointer is suitable to systems like Windows 98/2000/ME/XP/Macs/Linux/Vista and so on.