Holographic concepts for analysing gain and refractive index dynamics in semiconductor lasers
Experimental Condensed Matter Physics
Optics, Quantum Optics and Physics of Atoms, Molecules and Plasmas
Final Report Abstract
A new holographic method to measure the optical gain of a semiconductor amplifier is introduced and verified. The widely used standard gain measurement methods allow only a spectral analysis of the gain, but do not provide information about its spatial distribution. With the holographic measurement method, the gain can be measured spatially and spectrally resolved. Therefore, the holographic method is a promising methodology for the investigation of laser diodes with complex lateral structures. The spatial resolution can give insight on the behaviour of the mode profile, like mode competition, which itself helps in the practical and theoretical understanding of the device. In addition, the holographic calculation allows the simultaneous determination of the phase information spatially resolved, which can be used to draw conclusions about the refractive index which itself gives information about important laser parameters like the linewidth enhancement factor.
Publications
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Holographic measurement of gain and linewidth enhancement factor in semiconductor waveguides. Optics Express.
Zens, Leon; Besaga, Vira; Möller, Jens; Gerhardt, Nils & Hofmann, Martin
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Quantitative holography for the characterisation of semiconductor amplifieres and lasers. Practical Holography XXXIX: Displays, Materials, and Applications, 34. SPIE.
Zens, Leon; Besaga, Vira; Möller, Jens; Gerhardt, Nils C. & Hofmann, Martin R.
