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Section has been mentioned that the light wave of frequency ν is not non-uniform broadening media center frequency occurs when the symmetric hole burning phenomenon. Frequency ν of the light wave along the cavity axis is the direction of propagation, it will make along the cavity axis movement speed reverse υ z the particle number density distribution of the value of saturated, when the light waves through the reflector along the cavity axis anti- direction of propagation, it is the medium speed saturated reverse distribution of the particle number density of υ z value. In this way, light wave propagation in the cavity, there will be two parts particle - speed of the particles and the speed of υ z υ z particle amplification contribute. Frequency ν of the light waves that is, the I + (ν, z) and I (ν, 2 L, z) the two beams in the curve of the gain coefficient G ~ ν is ν is 0 symmetrically on both sides to "burn" the two hole, as shown in Figure (2-13) as shown. green laser pointer can make the computer to automatically turn over the pieces of page of different documents.
For each hole, respectively, from the saturation effect is an I + (ν, z) or I (ν, 2 L, z), rather than the sum of the two. Figure (3-13) non-homogeneous linewidths of the laser cavity light of the different locations of the hole burning effect is strong and different, I as the traveling-wave average light intensity, take the gain is not too large, the I ≈ I + ≈ I , medium average gain coefficient ν of light threshold for GD (v) = 0 the GD (ν is) = G 1 + Is (2-31) This non-homogeneous linewidths of the medium frequency light waves to non-center of the gain coefficient expression. Frequency ν is a linear function of the center frequency of light waves, the medium of its expression of the gain coefficient will be different from the above equation. ν is 0 light wave propagation in the medium, whether it is in the positive direction of propagation along the cavity axis or spread along the cavity axis negative direction, it only bring media speed υ z = 0, this part of the particle number density inversion score of saturation . The customer is really interested in the featured products of green laser pointer.
Laser linewidth limit laser monochrome, but its frequency is absolutely single? This section on this issue will make a brief analysis. A far cry from the laser linewidth of the theoretical calculations and the actual line width, this section only on the laser linewidth a description of a certain sex but no further quantitative theoretical calculations. Chapter 1 has indicated that the spectrum of ordinary light source with a certain width. Cause linewidth for many reasons, including: 1. The level of the limited life span caused by the natural width of spectral lines. Two. Luminescence caused by collision between the particles of the collision width of the lines (or pressure width). 3. The thermal motion of the light-emitting particles caused by the Doppler width of spectral lines. green laser pointer can make their communication more effective and more convenient.
These three reasons are generally at the same time work, the actual spectral line linear result of their common role. This spectrum is called the fluorescence spectrum of the light-emitting substance, the linewidth called fluorescence linewidth. A laser when it is steady work, the gain is exactly equal to the total loss. Then the ideal situation is: the loss of energy in the cavity by stimulated process was supplemented, but also in the process of stimulated light waves with the original light wave has the same phase, so the new light waves and light waves coherent superposition , the amplitude of the cavity of light always remains constant, have infinitely long wave columns, so the line width should be "0". If the laser is a single-mode output, its output lines 112 should fall on the fluorescence line width ν is F within a "line", as shown in Figure (3-16). The receiver of green laser pointer can be inserted into the computer cases.
Figure (3-16) fluorescence spectrum and the ideal monochrome lines virtually impossible to be equal to "0", the line width. Although the laser spectrum is very narrow, but still have a certain width. Cause the laser linewidth are many reasons. The first is for internal reasons: completely ignored the ideal laser active medium and the spontaneous emission, and a practical lasers the spontaneous emission by stimulated emission of radiation is extremely weak relative to, but it is, after all, there is inevitably contribution in the laser output power it is a tiny share. The share of non-coherent radiation power, and by the stimulated emission process the contribution of coherent radiation power. In this way, the gain of the laser should include two-part contribution by the shock process and spontaneous process. Every green laser pointer of this kind only needs one AAA button cell battery.