Journal
OPTICS EXPRESS
Volume 23, Issue 11, Pages 14763-14773Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.014763
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Funding
- National Natural Science Foundation of China [11404326, 61234004, 51172225, 61176045]
- Foundation of Jilin Province [20140520113JH]
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We report on the design and fabrication of 894.6nm vertical-cavity surface-emitting lasers (VCSELs) with extremely low threshold at high temperatures, for use in chip-scale Cs atomic clocks. A new design method based on the analysis of the threshold gain and the desired carrier density for different active region structures was proposed to gain the low transparent current density. The increase of the threshold current at higher temperatures was successfully suppressed by introducing the large gain-cavity detuning of VCSEL. By detuning the gain-cavity mode to be -11 nm, the minimum threshold current of only 0.23mA at 70 degrees C was achieved. The operating temperature for emitting the wavelength of 894.6nm was 110 degrees C, with the single mode suppression ratio (SMSR) of more than 25dB and the threshold current of only 0.32mA. (C) 2015 Optical Society of America
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