TITLE

Interferometric study of thermal dynamics in GaAs-based quantum-cascade lasers

AUTHOR(S)
Pflügl, C.; Litzenberger, M.; Schrenk, W.; Pogany, D.; Gornik, E.; Strasser, G.
PUB. DATE
March 2003
SOURCE
Applied Physics Letters;3/17/2003, Vol. 82 Issue 11, p1664
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The thermal dynamics in quantum-cascade lasers under pulsed operation is investigated by a scanning interferometric thermal mapping technique. An infrared laser beam probes the change in the refractive index caused by current-induced heating of the working devices. The measured phase shift provides a quantitative information on the thermal characteristics with a micrometer spatial and a nanosecond time resolution. Comparing the experiments with a two-dimensional thermal model enables us to determine the anisotropic heat conductivity in the multilayered active region, found to be much lower than the one of bulk GaAs, as well as the temperature increase in the active region during pulsed operation.
ACCESSION #
9275618

 

Related Articles

  • Laser interferometer with fine-focused beams to monitor the spatial position of an object. Ryabukho, V. P.; Khomutov, V. L.; Lyakin, D. V.; Konstantinov, K. V. // Technical Physics Letters;Feb98, Vol. 24 Issue 2, p132 

    Analogies with interferometers using a light source with low temporal coherence are used to analyze the principles of the construction of laser interferometers with averaging over the photodetector aperture, whose sensitivity to the position of an object being monitored at the maximum of the...

  • Measurement of the temperature and the pumping uniformity inside a Nd:YAG rod by an... Kwang Suk Kim; Hong Jin Kong; Cheol Jung Kim // Applied Physics Letters;4/29/1991, Vol. 58 Issue 17, p1810 

    Studies the thermal behavior of a Nd:YAG laser rod under flashlamp pumping. Use of an interferometric technique in the study; Evaluation of the degree of pumping uniformity and the heat generation rate inside the rod for single pulse pumping.

  • Interferometric position sensor samples standing waves.  // Laser Focus World;Sep2003, Vol. 39 Issue 9, p9 

    Reports that an interferometric position sensor contains partially transparent photodetectors placed in a cavity. Sampling of the stranding waves that forms in the cavity.

  • Calorimetric interferometry using pulsed Nd-glass laser for measurement of small absorption coefficient at 1.06 μm. Yoon, Jae Sun; Lee, Sang Soo // Applied Physics Letters;5/15/1985, Vol. 46 Issue 10, p913 

    A new calorimetric interferometry using a pulsed high power Nd-glass laser was developed to determine small absorption coefficients of the order of 10-3 cm-1 or less at the wavelength of 1.06 μm. The absorption coefficients of the liquid specimens, C6H6, C6H5Cl, 0-C6H4Cl2, and 1,2,4-C6H3Cl3,...

  • Holographic interferometry for the structural diagnostics of UV laser ablation of polymer substrates. Bonarou, A.; Antonucci, L.; Tornari, V.; Georgiou, S.; Fotakis, C. // Applied Physics A: Materials Science & Processing;2001, Vol. 73 Issue 5, p647 

    Holographic interferometry is examined for its potential as a diagnostic tool of the structural modifications effected in laser-processing applications. The interferometric �comparison� of the holographic images of the sample recorded before and after irradiation enables the full-field...

  • Standing-wave interferometric microscope provides submicron resolution.  // Laser Focus World;Mar94, Vol. 30 Issue 3, p13 

    Reports that standing-wave interferometric microscope can provide submicron resolution. Provision of site-specific resolution by laser beams.

  • Shearography checks helicopter blades. O'Connor, Roy // Design News;1/22/2001, Vol. 57 Issue 2, preceding p44 

    Focuses on the use of shearography, a laser technology based on speckle interferometry, in checking helicopter rotor blades. Principle behind the technology; Advantages of the technology.

  • Sub-100 nm lines produced by direct laser ablation in polyimide. Phillips, H. M.; Callahan, D. L. // Applied Physics Letters;6/17/1991, Vol. 58 Issue 24, p2761 

    Shows how periodic line structures with a period of 167 nm and linewidths varying from 35 to 100 nm have been produced on polyimide by direct ablation with a KrF laser using an interferometric technique. Spontaneous growth of periodic surface structures due to radiation remnants; Factors...

  • Stable, single-(array)-mode operation from phase-locked, interferometric arrays of index-guided AlGaAs/GaAs diode lasers. Botez, D.; Mawst, L.; Hayashida, P.; Roth, T. J.; Anderson, E. // Applied Physics Letters;1/25/1988, Vol. 52 Issue 4, p266 

    Single-array-mode (L=8) oscillation is achieved with virtually diffraction-limited beams to three times above lasing threshold, and with beamwidths 1.5 times the diffraction limit at 4.7 times above lasing threshold and 130 mW output power per uncoated emitting facet. The arrays are...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics