Physics, 05.07.2019 03:20 trodgers0202
Problem 5 a laser mwatu pulse of frequency ω ; wavelength λ-0.5 um, pulse duration tri intensity i -i vel scheme relaxation aiccsedit ofis n. levels 12 and ㎝jis tuned to resonance with a gaseous system of two-level atoms whose le 10per sec. assume that there are no other relaxation transition of the same rate a 1o processes, and ignore doppler effects: 0- pulsed laser frequency co- 0 the bloch equations [a form of density matrix equations] describing the resonant interaction of a short-pulsed monochromatic laser (frequency ω。) with a two-level atom with energy levels as shown in the figure are given below: - hate. dwidt =-a(1+w) where v-i(p21-p12) and w =(p22-pii),and β 1/e+a2 , t、me v (3 points) a. what are p2,pii, p2 and p, a. b. t in terms of atomic parameters such as energy level and dipole moment and time constants? to describe the laser excitation process. (5 pointś) b solved the equations for the case where the induced transition rate is much larger v(2 points) b. explain the conditions that justify using bloch equations rather than rate equation than spontaneops transition, i. c. ignore the latter at what value of χ would you obtain population inversion?
Answers: 3
Physics, 22.06.2019 01:30, ladyty2109
Kate is working on a project in her tech education class. she plans to assemble a fan motor. which form of energy does the motor convert most of its electric energy into? a. light energy b. motion energy c. sound energy d. thermal energy
Answers: 1
Physics, 22.06.2019 14:20, jeny89
4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)
Answers: 3
Problem 5 a laser mwatu pulse of frequency ω ; wavelength λ-0.5 um, pulse duration tri intensity i...
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