Experimental evaluation of characteristic temperature with varying duty cycles in 2μm vertical cavity surface emitting lasers due to external optical pumping
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[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] Vertical cavity surface emitting lasers (VCSELs) are of interest due to their small size, low cost, tunability, and excellent beam quality. Moreover, the near infrared is one of the most interesting regions in the electromagnetic spectrum because of various applications. In fact, many environmental and gas sensing applications are dedicated to this region. VCSELs are able to generate good power output in the NIR region compared to other types of lasers. However, the output power is limited by the amount of heat generated inside the active region of these devices. In addition, the output varies with the operating temperature of the laser due to unwanted transitions that occur between the energy states of the active medium. In this thesis, the temperature sensitivity of a previously designed VCSEL device emitting at 2um is fabricated, and the optical output is studied extensively. The characteristic temperature is recorded and analyzed at different operating duty cycles showing a linear relationship between the temperature sensitivity and the operating duty cycle in pulsing mode. Moreover, the continuous operation mode was also investigated determining the saturation region of the device.
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