Consider Figure 5.4 shows the energy level diagram of the laser system, seeking populations the number density of the steady-state solution. Discuss the relationship between the pumping rate, and calculate the saturation intensity to achieve populations the number of density inversion distribution conditions are known to the level of the average life expectancy, average life expectancy of the transition between the spontaneous radiation, for the uniform plus wide transition lines, the two-level statistical weight equal to the stimulated transition probability is. Known wavelength is approximately the average life span of the upper and lower level 0.6328 lasers laser set the inflation pressure of the laser tube, saturated light intensity is, how can average light intensity when the cavity are as follows: (1) close to 0; (2) how much length of the resonator cavity length before the hole burning overlap? green laser pointer is a kind of tool which makes use of the laser as the indication.
A wavelength of 0.6328 of full-cavity laser Doppler linewidth 1500, the discharge capillary diameter of 1.2, both ends of the mirror reflectivity of 100% and 97%, other losses can be neglected, so that the laser in 1-2 longitudinal mode, but not three longitudinal mode; (2) a single longitudinal mode, and estimate the cavity allowed range. (Maximum small signal gain coefficient of the laser pressing is estimated that, including the frequency of the resonator of the thought unit discharge capillary diameter) shown in Figure 5.7, the ring laser, set the mode of the counter-clockwise moving are the output light strong, respectively, and. It is one of the most common applications of green laser pointer used by the customer.
The laser tube filling gas to a single neon isotope, and try to draw timely gain curves and populations of the number density inversion of the axial velocity profile; (2) At that time, the laser output beam stability of light, while the At that time there will be a beam of light, a beam of light goes out phenomenon, try to explain their reasons; (3) When the laser tube filled with an appropriate proportion of the gas mixture, to eliminate the above-mentioned beam of light to strong; make a bunch of light weakened, test to the case example of the reason; (4) of the basic symmetry of the gain curve of the mixed gas, in charge of mixed gas, what isotopes should be some. Beat frequency between the calculated frequency pulling caused by the two adjacent longitudinal mode with the passive cavity frequency difference between the poor. Therefore, green laser pointer can be used to point at, show or observe the star by the stargazer.
Gas laser Doppler widening; homogeneously broadened laser. What is the significance of the linear function? Solution: to quantitatively describe and compare the features of the broadening of spectral lines, it gives the contours of spectral lines, interpreted as the spontaneous emission transition probability distribution function of the frequency. Linear function with the small signal gain coefficient what is the relationship? Small-signal gain curve shape depends entirely on the linear function of the corresponding transition lines. A model for the spontaneous emission transition probability of a photon in this mode caused by the shock transition probabilities, and why? A model for the spontaneous emission transition probability of a photon in this mode due to stimulated transition probability. green laser pointer is really a very useful and practical tool for the customer to select.
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