Optical Gain and Lasers

紀公雄 氏原

1 A one-dimensional optical cavity with output coupling-classical analysis- 2 A one-dimensional optical cavity with output coupling-quantum analysis- 3 A one-dimensional quasimode laser: General formulation 4 A one-dimensional quasimode laser-Semiclassical and quantum analysis- 5 A one-dimensional laser with output coupling -Derivation of the laser equation of motion- 6 A one-dimensional laser with output coupling-Contour integral method- 7 A one-dimensional laser with output coupling-Semiclassical linear gain analysis 8 A one-dimensional laser with output coupling-Semiclassical nonlinear gain analysis 9 A one-dimensional laser with output coupling-Quantum linear gain analysis- 10 A one-dimensional laser with output coupling -Quantum nonlinear gain analysis- 11 Analysis of a one-dimensional laser with two-side output coupling -The propagation method- 12 A one-dimensional laser with output coupling -Summary and interpretation of the results- 13 Spontaneous emission in a one-dimensional optical cavity with output coupling 14 Theory of excess noise 15 Quantum theory of the output coupling of an optical cavity Appendices

M.E. Marhic

Ta-Wei Kao, Patrick LiKamWa, Alan Miller +3 more

The gain characteristics of strained layer InGaAs quantum well laser amplifiers grown on GaAs substrates have been characterized using a Ti-sapphire laser in both CW and self-mode- locked configuration. All-optical bistability was achieved in such a device through the nonlinear refractive index that arises as a result of the gain saturation of the diode amplifier at high optical intensities. The Ti-sapphire laser was modified to produce wavelength tunable pulses of the order of 150 fs with a 15 nm spectral bandwidth in order to measure the dynamics of the gain using a time resolved optical pump-probe technique. The gain saturation occurs on the time scale of the pulse width of the laser and the initial recovery is extremely fast. This initial speedy recovery on a time scale of 100 fs is followed by a slower recovery with a time constant of 3 ps followed by a much slower recovery of 500 ps.

P. L. Knight

A F J Levi

Zifan Zhou, Ruoxi Zhu, Nicholas J. Condon +3 more

In this paper, we present the experimental observation of simultaneous bi-directional superluminal lasing in a triangular ring cavity without gain competition and crosstalk as needed for realizing a gyroscope based on the Sagnac effect. The gain spectrum for each of the lasers is tailored to be a narrow dip on top of a broad gain using two stable isotopes of Rb. Specifically, we make use of 85Rb to produce a broad gain spectrum via the optically pumped Raman gain process and 87Rb to produce a narrow absorption spectrum via the optically pump Raman depletion process. A separate gain cell is used for the laser in each direction. Inferred from the simulation, the spectral sensitivity enhancements of the clock-wise and counter-clock-wise superluminal ring lasers are ∼362 and ∼505, respectively, with the imbalance attributed to differences in pump powers.