Publication

Reflectance Modulation Studies On Laser Diode Mirrors

1992
Conference Papers

Abstract

The versatility and usefulness of the newly developed reflectance modulation technique for laser mirror characterization will be demonstrated by means of typical examples of application on (110) facets of 10-mu-m wide ridge waveguide AlGaAs/GaAs quantum well lasers: (1) Typical, maximum temperature increases DELTA-T derived from the reflectance changes DELTA-R/R are congruent-to 1 K per 1 mW optical diode power for uncoated mirrors and are congruent-to 10x lower for lambda/2-Al2O3 coated ones. DELTA-T is sensitive to the facet surface treatment prior to coating. (2) Temperature maps show a very localized hot spot within the near-field region and are in accordance with our two-dimensional heat flow calculations. (3) Degradation processes have been monitored in real time. Thus, we determined a critical temperature increase DELTA-T congruent-to 120 K for the occurrence of catastrophic optical mirror damage in the AlGaAs system.

Official source

https://infoscience.epfl.ch/entities/publication/e70beb3c-79d5-4a83-88b9-c1686e3aa781

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1992
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/e70beb3c-79d5-4a83-88b9-c1686e3aa781

About this result

Related concepts (32)

Laser diode

A laser diode (LD, also injection laser diode or ILD, or diode laser) is a semiconductor device similar to a light-emitting diode in which a diode pumped directly with electrical current can create lasing conditions at the diode's junction. Driven by voltage, the doped p–n-transition allows for recombination of an electron with a hole. Due to the drop of the electron from a higher energy level to a lower one, radiation, in the form of an emitted photon is generated. This is spontaneous emission.

Laser

A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word laser is an anacronym that originated as an acronym for light amplification by stimulated emission of radiation. The first laser was built in 1960 by Theodore Maiman at Hughes Research Laboratories, based on theoretical work by Charles H. Townes and Arthur Leonard Schawlow. A laser differs from other sources of light in that it emits light that is coherent.

Blue laser

A blue laser emits electromagnetic radiation with a wavelength between 400 and 500 nanometers, which the human eye sees in the visible spectrum as blue or violet. Blue lasers can be produced by direct, inorganic diode semiconductor lasers based on quantum wells of gallium(III) nitride at 380-417nm or indium gallium nitride at 450nm diode-pumped solid-state infrared lasers with frequency-doubling to 405nm upconversion of direct diode semiconductor lasers via thullium or paraseodyium doped fibers at 480nm metal vapor, ionized gas lasers of helium-cadmium at 442 nm and 10-200 mW argon-ion lasers at 458 and 488 nm Lasers emitting wavelengths below 445 nm appear violet, but are called blue lasers.

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Reflectance Modulation Studies On Laser Diode Mirrors

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