Low-temperature performance of InP-based long-wavelength VCSELs |
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Authors: | A Lytkine A Lim J Bacque W Jäger J Tulip |
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Institution: | (1) Electrical & Computer Engineering, University of Alberta, Edmonton, Alberta, T6G 2V4, Canada;(2) Chemistry Centre, University of Alberta, Edmonton, Alberta, T6G 2G2, Canada |
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Abstract: | We have studied, for the first time, the parameters of long-wavelength InP-based buried tunnel junction (BTJ) VCSELs with
substrate temperature varied in the range between 150 and 330 K. The BTJ-VCSELs with threshold currents <1 mA were designed
by VERTILAS (Germany) to operate near 1512 nm and 1577 nm at room temperature (models VL-1512 and VL-1577, respectively).
Reducing the substrate temperature of the lasers from room temperature to 150 K resulted in more than a fourfold increase
of the threshold injection current accompanied with threefold and twofold increases in output power and slope efficiency,
respectively. We have observed continuous single-mode tuning over intervals up to ∼20 nm (VL-1512) and ∼22 nm (VL-1577) at
constant injection currents and substrate temperatures varied in a 180 K range. The emission wavelength was found to shift
linearly with temperature with rates of 0.11 nm/K and 0.12 nm/K for lasers VL-1512 and VL-1577, respectively. The single-mode
laser output reached ∼3 mW for both lasers cooled down to 173 K. Gas sensors based on BTJ-VCSELs can be temperature tuned
over wide spectral intervals using either a cooler or a low ambient temperature to control laser substrate temperature. Ultra-sensitive
gas concentration measurements under low ambient temperatures may include chemical analysis of the lower earth stratosphere
and of the martian atmosphere.
PACS 42.55.Px; 42.62.Fi; 39.30.+w |
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Keywords: | |
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