Red VCSEL for high-temperature applications

Roßbach, R.; Ballmann, Tabitha; Butendeich, R.; Schweizer, H.; Scholz, F.; Jetter, Michael

doi:10.1016/j.jcrysgro.2004.08.125

Cited by 14 publications

(1 citation statement)

References 9 publications

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“…Moreover, POF has minimal optical loss in the wavelength range of 650-680nm, making red VCSELs a suitable candidate for use in large computer networks, automobiles, airplanes, homes, and offices [3]. Especially in high-temperature automotive applications, red VCSELs require reliable performance for up to 125°C [4]. Red VCSELs have also shown to be advantageous in variety of medical sensing and diagnostic applications, such as pulse oximetry as a non-invasive method for monitoring the oxygen content in blood [5].…”

Section: Introductionmentioning

confidence: 99%

650nm red VCSELs with improved temperature performance

Ghods

Dummer

Johnson

2023

Vertical-Cavity Surface-Emitting Lasers XXVII

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In this paper, we report on design optimization, design, and fabrication of single-junction red VCSELs emitting at the wavelength of ~650nm with improved power and temperature performance. This has been achieved through redesigning the VCSEL epitaxial structure by optimizing the number of top and bottom mirror pairs to reduce the optical losses, optimizing p-DBRs' doping concentration levels, changing the oxide layer thickness and position relative to the active region, and adjusting the wavelength detuning between peak wavelength of the gain medium and the Fabry-Perot dip wavelength. Moreover, several changes have been implemented to improve the carrier confinement in the active region to improve the performance of these devices at higher temperatures. These include optimizing the net strain across the active region, modifying the electron blocking layers, and also optimizing the number and thickness of InGaPbased multiple quantum wells. The CW characterization results indicate a record-high output optical power of 4.25mW at room temperature for a 14m VCSEL. The temperature-variable L-I-V characterization results indicate a maximum lasing temperature of 50°C for the 14m VCSEL, while the 5m device has shown to be lasing up to 80°C. All devices have shown to be highly multi-mode spectrally, but with different far-field beam profiles. Moreover, the results indicate that the output light from these devices are strongly polarized in the <011> direction. Overall, the results depict a promising roadmap into developing high brightness red VCSELs which have superior performance over a broad temperature range.

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Section: Introductionmentioning

confidence: 99%