Figure 3. Demonstration of optically and electrically pumped surface-emitting ASE in TE-DIZO devices. (IMAGE)
Caption
Figure 3. Demonstration of optically and electrically pumped surface-emitting ASE in TE-DIZO devices. (a), (b) The PL spectra of TE-DIZO device pumped by a 355 nm fs laser at 77 K. The PL spectra can be deconvolved into three Lorentzian bands, corresponding to the 1P emission at 590 nm, 1S emission at 620 nm and 1S ASE at 628 nm. The 1S ASE at 628 nm increases rapidly and super-linearly, accompanied by a significant line narrowing. (c) The 1S (left, red squares) and 1P (left, green squares) PL intensities and linewidths (right, yellow, and blue circle) as a function of pump fluence. These data exhibit typical signatures of the transition to ASE, signaled by the linewidth narrowing and the change in the log-log slope of the growth of the PL intensity. (d), (e) The EL spectra of TE-DIZO device pumped by a 63 ns pulsed current at 153 K. The EL spectra can be deconvolved into three Lorentzian bands, corresponding to the 1P emission at 595 nm, 1S emission at 623 nm and 1S ASE at 634 nm. (f) The 1S (left, red squares) EL intensities and linewidths (blue circle) as a function of injection current. At the threshold current of 96 A cm−2, the EL at 634 nm increases rapidly and super-linearly (slope k changing from 0.8 to 1.2), accompanied by a narrowing of the linewidth, confirming the emergence of 1S ASE.
Credit
Fengshou Tian et al.
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