The page-turning led flash light has already been widely used in society

For the simple coaxial spherical cavity, we can use top-style transformation of the child in a stable form within the cavity, it is stable cavity. 75 any of the confocal cavity with an infinite number of stable equivalent spherical cavity, a spherical cavity is generally the only stable one for confocal cavity, their wave field is the same. Equivalent confocal cavity parameters include: the equivalent confocal cavity of the chamber center coordinates of the origin, from the coordinate origin to the general stability of the spherical coordinates of two cavity mirrors Z1 and Z2, along with its focal length mirror confocal cavity F, these three parameters can determine the equivalent confocal cavity completely.When select a green laser pointer, remember to check if the optical spot is big and light. According to the formula (laser principle p66-2.8.4) to be: if you know of a Gaussian beam waist radius of ω = 0.3mm, wavelength λ = 632.8nm. Find the parameter values of q at the waist, and waist 30 cm away from the q parameter values, and the waist away from the value of q at infinity. Answer: waist at the q parameter value is actually a book of bus parameters (laser principle p73-2.9.12): problem solving equations can be obtained in the request. A Glossary and essays for a spectral line broadening due to various factors, spontaneous emission is not monochromatic, that is not a single frequency spectrum of light, and contains a range of frequencies, called spectral line broadening 2. linear function, linear function ~ is defined as a linear function g (ν, ν 0) = p (ν) / p, which ν0 on behalf of the center frequency, p = one frequency radiation power p (v) the sum of all frequencies radiated power the ratio. Remember to check what kinds of computer files the green laser pointer can identify.Widening the main mechanism of carbon dioxide laser and size 6 particles in the process of laser-produced three-level system in the transition process and the process of laser-produced particle level characteristics in the three-level system characterized by the transition process and the level (1) excitation under the action of the pump source, the particles on the ground state E1 is pumped to the level E3, the probability is set to W13 in the pumping light excitation, W13 is the stimulated absorption transition probability for the other incentives, the W13 only that particles per unit time probability of being pumped to the E3. (2) the particles reach the energy level E3 will be mainly in the form of a non-radiative transition very quickly on the transfer of laser energy level E2, the probability for the S32, In addition, the energy levels of particles can also spontaneous emission, non-radiative transition etc.The page-turning led flash light has already been widely used in society. Back to the ground state E1, but for the average laser working substance, this elimination process, the probability of excitation is small, the S21 <S32, A31 <S32. (3) the laser energy level E2 are generally on the metastable level, without Prior to the formation of inversion population on the level of particles will be mainly to the form of return of spontaneous transitions E1, and A21 small, that is, particles in the E2 on the longer life expectancy, in addition, E2 level on the particles may be passed without radiative transition back E1, but under normal circumstances, S21 <A21, A21 smaller because, if the particles to the pumping rate is high enough on E2, it is possible to reverse the population on the formation of the state, once this happens, All teachers can use green laser pointer to get rid of the embarrassment of being restricted by the dais.then the E2 and E1 transitions between the stimulated emission and absorption transition compared to the account overwhelming.