2013
DOI: 10.1063/1.4803081
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Stimulated emission from ZnO thin films with high optical gain and low loss

Abstract: Abstract:Stimulated surface-and edge-emission were investigated for ZnO thin films grown epitaxially by pulsed laser deposition. The lasing threshold was 0.32 MW/cm 2 for surface pumping and 0.5 MW/cm 2 for edge pumping, which is significantly lower than thresholds observed previously. A modified variable stripe length method was used to measure the gain, which was 1369 cm -1 for Nband emission. Losses were measured using the shifting excitation spot method and values of 6.2 cm -1 and 6.3 cm -1 were found for … Show more

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Cited by 47 publications
(30 citation statements)
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“…Defects, surface states, multimode lasing, poor end facet reflectivities, mode overlapping, and mode competition are many aspects that still must be addressed for improved device efficiency. Nanowire lasers are still unable to outdo their thinfilm counterparts, where 100-500 kW/cm 2 output intensities are typically reported (Table 1) [28,103]. In the next section, we review how to overcome these losses using advanced photonic designs.…”
Section: (C) Gain and Lossesmentioning
confidence: 99%
“…Defects, surface states, multimode lasing, poor end facet reflectivities, mode overlapping, and mode competition are many aspects that still must be addressed for improved device efficiency. Nanowire lasers are still unable to outdo their thinfilm counterparts, where 100-500 kW/cm 2 output intensities are typically reported (Table 1) [28,103]. In the next section, we review how to overcome these losses using advanced photonic designs.…”
Section: (C) Gain and Lossesmentioning
confidence: 99%
“…[5][6][7] In particular, the high optical gain of ZnO has attracted attention for use in sensing and optoelectronics applications. 8 ZnO can be grown as different kinds of one-dimensional (1-D) nanostructures, such as nanocombs, 9 nanorods (NRs), 10 nanobelts, 11 nanoflowers, sensors because of their low cost, thermal/chemical stabilities, radiation hardness, and high transparency in the visible range. 13 Among these various morphologies, 1-D ZnO NRs have recently attracted significant attention because of their special shape and structure, which results in excellent piezoelectric, magnetic, and optoelectronic properties.…”
Section: Introductionmentioning
confidence: 99%
“…As a result, the emission peak at 379 nm can be attributed to the room-temperature exciton recombination emission, and the other emission peak at 390 nm maybe originate from the P-band emission due to the exciton-exciton collision at high exciton density condition. 38,39 The collision between the excitons becomes more intensive with the increase of the excitation power intensity, eventually the exciton emission was totally changed to the P-band emission. Figure 5(a) shows the UV near band edge emission spectra from the ZnO:Sn microdisks excited by focused laser pulses with different excitation power densities.…”
mentioning
confidence: 99%