Physics, 13.07.2019 23:20, patricia1964
The rate equations may be written heuristically by considering various physical phenomena through which the number of photons, p, and the number of electrons, n, change with time inside the active region. for a single-mode laser, these equations take the form -gp+r dt sp dn i n g is the net rate of stimulated emission and rsp is the rate of spontaneous emission into the lasing mode. note that rsp is much smaller than the total spontaneous-emission rate. τ.is the lifetime of carrier and tp is the lifetime of photon. (a) the modulation response of semiconductor lasers is studied by solving the rate equations provide in the above with a time-dependent current of the form where ib is the bias current, im is the current amplitude, and ω represents the angular frequency of the modulating current. determine the response of the semiconductor laser and 3-db bandwidth. (b) the system of differential equations for a small perturbation δ n in the carrier and δ p in photons densities constitute a second order linear system much like the equations for the current and the voltage in an lcr circuit. solve the second order differential equation and determine the relaxation frequency. compare the result with that from (a)
Answers: 3
Physics, 21.06.2019 18:40, JellalFernandes
An observer that stands still as the electron moves by him, will observe
Answers: 3
Physics, 21.06.2019 23:30, 1031kylepoe03
Acoil formed by wrapping 80 turns of wire in the shape of a square is positioned in a magnetic field so that the normal to the plane of the coil makes an angle of 28.0° with the direction of the field. when the magnetic field is increased uniformly from 200 µt to 600 µt in 0.400 as, an emf of magnitude 80.0 mv is induced in the coil. what is the total length of the wire?
Answers: 3
Physics, 22.06.2019 12:30, zayeboyd4971
Uppose we consider the system of the three capacitors as a single "equivalent" capacitor. given the charges of the three individual capacitors calculated in the previous part, find the total charge qtot for this equivalent capacitor. express your answer in terms of v and c.
Answers: 2
The rate equations may be written heuristically by considering various physical phenomena through wh...
Mathematics, 06.03.2020 15:29
Mathematics, 06.03.2020 15:30