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If (a1 + t1) is very small, can be of ln [1 (a1 + t1)] series expansion, taken to an approximation, there are a total = a1 + t1, 2L (3-56) under these conditions, (3-55) laser expert wave of the average light intensity I can be reduced to I = laser output intensity can be expressed as Is 2 2 LG 0 1 a1 + t1 (3-57) out = t1 I = Is 2 2 LG 0 t1, 1 a1 + t1 (3-58) the average laser beam cross section A, the laser output power of the LG 0 1 1, P = AI out = t1 I s, A, 2 a1 + t1, 105 (3-59) (3-59) by the homogeneous linewidths of the gain medium, the laser output power P and laser all parameters of the relationship between 3 the relationship between output power and various parameters (1) output power and saturation intensity relationship between the laser output power P and the saturation intensity of the I s, is proportional to. The transparent sealed plastic bag is needed for packing green laser pointer.
That as long as the recall about the first 2.3 of the saturation intensity discussion, it is understandable. (2) A large output power and beam cross-section beam cross-section laser, the output power P is also large. A large beam cross-section of the higher order transverse modes than the fundamental mode, therefore, in general, the output of the higher order transverse mode laser output power than with the model output fundamental mode laser output power is large. Always want to lose part of the mirror transmittance t1 select the laser output power in the relationship between design laser output power and output mirror transmittance. Power, the mirror loss is small, to make the most of them are used for the laser output light waves in the cavity round-trip time of light energy that want to (3-54) becomes I (2 L) I + (0) = (a1 + t1) I (2 L) ≈ t1, the I (2 L), which requires t1 selected as large as possible, the a1 control as small as possible, so that t1 >> a1. Some featured products ofgreen laser pointer have been revised.
(3-56), can be seen, can not choose too large t1, t1 too large to make the threshold of the gain coefficient G threshold increased, if the media process gain coefficient 2LG not big enough, will cause the cavity light intensity decreases, but the output power is reduced, in severe cases even make the cavity can not form the laser. Of course, the transmittance t1 can not be selected too small, because t1 is too small, although it makes the threshold of the gain coefficient decreased, so that the intracavity intensity enhanced with the cavity light intensity increased, the mirror loss a1 the I ( 2 L) will increase, which makes the light in the medium and from the time the increase in light energy for the loss of part of the Cadogan did not achieve the desired effect of the increase in output. This type ofgreen laser pointer has the function of remote control.
Laser output power must be part of the mirror transmission ratio is the best value. Best value by the extreme value of (3-59), has been, and even if 0 dP = 0, while 1 + t1 dt1 2 LG 0 1 2 the LG 0 1 AI s AI s = 0 2 2 a1 + t1, 2 (a1 + t1) solution of this equation = t1, 106 (2 the LG 0 a1) 2 a1 = a1 (LG 0 a1) is the best expression of the transmittance, the transmittance, the laser output power of 1 (3-60) P = 1 I s A a1 2 = (2LG 0 2 LG 0 a1 1 2 LG 0 a 1 (3-61)) 1 I s A (2 LG 0 a1) 2 2 the actual work is always The first experimental method to determine the optimal transmission rate, then by (3-60) to estimate the size of the mirror loss. 3.5.2 non-homogeneous linewidths of the media, the laser output power in a non-uniform broadening the type of media, the frequency ν of light waves can only speed the reverse distribution of particle number density of ± υ z saturated particles of the other speed The number density inversion distribution value has almost no effect. The black body color of green laser pointer is very popular.
The gain medium on the gain coefficient of the longitudinal mode of the cavity is limited only by the light of the impact of the longitudinal mode is basically strong has nothing to do with the other longitudinal mode light. Difference between the non-homogeneous linewidths of the media and the homogeneous linewidths of the media. Therefore, the discussion of non-uniform broadening media constitute the laser longitudinal mode can be carried out independently. A stable light expression of various parameters of the laser in the stability of the light, the cavity of various parameters to achieve stable part of the parameters and the homogeneous linewidths media similar to light waves spread in the cavity as shown in Figure (3-12) below. Figure (3-12) non-homogeneous linewidths of the laser cavity intensity of non-homogeneous linewidths of the medium change gain coefficient of light waves with frequency ν, the following two cases discussed, that is, light waves 107 frequency of the center frequency of the medium ν is 0 and the light frequency ν is not media center frequency. Distance of remote control of green laser pointer is about 15m.