O'Reilly logo

Semiconductor Laser Engineering, Reliability and Diagnostics: A Practical Approach to High Power and Single Mode Devices by Peter W. Epperlein

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chapter 8

Novel diagnostic laser data for mirror facet disorder effects; mechanical stress effects; and facet coating instability

8.1 Diode laser mirror facet studies by Raman

8.1.1 Motivation

8.1.2 Raman microprobe spectra

8.1.3 Possible origins of the 193 cm−1 mode in (Al)GaAs

8.1.4 Facet disorder – facet temperature – catastrophic optical mirror damage robustness correlations

8.2 Local mechanical stress in ridge waveguide diode lasers

8.2.1 Motivation

8.2.2 Measurements – Raman shifts and stress profiles

8.2.3 Detection of “weak spots”

8.2.4 Stress model experiments

8.3 Diode laser mirror facet coating structural instability

8.3.1 Motivation

8.3.2 Experimental details

8.3.3 Silicon recrystallization by internal power exposure

8.3.4 Silicon recrystallization by external power exposure – control experiments

References

Introduction

This chapter investigates three phenomena closely linked to the performance and reliability of diode lasers. The first phenomenon is related to specific, microscopic root causes of degradation processes in the susceptible mirror facets. It has been found by Raman microprobe spectroscopy that the strength of lattice disorder is positively correlated with the local facet temperature and negatively correlated with the power level at catastrophic optical mirror damage (COMD) of etched (Al)GaAs laser mirrors. By using different analysis techniques the atomic origin of the lattice disorder effect could be identified. The second phenomenon deals with the formation ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required