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Journal of Quantitative Spectroscopy and Radiative Transfer

Gain saturation in a laser amplifier driven by a CW oscillator

George Emanuel

Published May 1, 1972• 2 citations
Publisher
DOI
10.1016/0022-4073(72)90079-9

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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.
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.