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Scalar and vectorial approaches to cavity modes of the GaAs-based 1.3-mm oxide-confined edge emitting diode laser.

Czyszanowski T., Nakwaski W.

Optica Applicata

2007

Vol. 37, nr 3

209-218

The modelling of optical fields within cavities of GaAs-based oxide-confined edge-emitting diode lasers is analysed treating the 1.3-mm InGaAs/GaAs quantum-well laser as an example of a typical device. Usability of two different optical approaches is compared. While in the first approach, based on the scalar wave simplification, optical fields within laser resonators are found to be composed of the TE modes, an alternative, more precise vectorial approach leads to the hybrid modes: EH and HE. Advantages and disadvantages of both methods are discussed and their validity limits in determination of mode intensities are compared. Simplified scalar approaches have often happened to be surprisingly exact, except for their weaker guidance occurring for higher-order modes, narrower aperture widths and/or thinner oxidation layers, when more exact but also more time-consuming vectorial approaches should be exclusively used.

The 1.3 mu m Q-switched Nd:YAG laser.

Ostrowski R., Marczak J.

Optica Applicata

2001

Vol. 31, nr 3

553-562

The paper presents experimental results of investigation of flash lamp pumped Nd:YAG laser operated at wavelength lambda =1.32 mu m. Thresholds and resonator losses have been determined. In the active Q-switched mode, output pulses up to 29 mJ energy and pulse width of 37 ns have been obtained. Moreover, an intracavity Raman laser producing 1.53 mu m radiation when pumped by Nd:YAG laser operated at 1.32 mu m is presented. Output Raman pulses up to 10 mJ energy have been obtained. Raman beam cleanup and 36% energy conversion efficiency, have been observed.