Competition of whispering gallery lasing modes in microwire with hexagonal cavity

Abstract

The competition characteristics of different orders of whispering-gallery lasing modes in a single ZnO microwire with hexagonal cavity are investigated comprehensively. As the scale of the cavity increases, the mode competition would be emerging strongly. The high-order whispering-gallery mode (WGM) lasing is indicated to be transverse electric modes with polarization dependence of about 86%. In addition, the competition of whispering-gallery lasing modes depends strongly on the diameter of cavities and the excitation intensities due to the effects of spatial hole burning. The Power Fourier transfer gives the distinct path length of fundamental and high-order optical field. Moreover, the finite difference time domain presents the optical field of high-order WGM lasing that tends to be closer to the center of hexagonal cavities. Remarkably, the Purcell factors of WGM are enhanced strongly with the reduction in diameter of hexagonal cavities, and the maximum value of F p approaches 20.

Room-temperature Continuous-Wave Upconversion White Microlaser Using a Rare-earth-Doped Microcavity

“…Further confirmation of lasing onset using narrowing of the full width at half maximum and annihilation of the Purcell-enhanced spontaneous emission is shown in Section III of the Supporting Information. 36,49 At 8000 μW pump power, the RGB lasers are well balanced, and the calculated chromaticity (0.297, 0.323) is very close to that of the CIE 1931 standard white illuminant D65 (0.312, 0.329), 50 as shown in Figure 3b. By further increasing the pump power to 8800 μW (0.296, 0.328), the CIE coordinate of the laser shifts little, as the RGB lasers are saturated.…”

“…The 53 μm-diameter microsphere cavity has abundant resonant modes in the visible band; therefore, the competition between the lasing modes and the spontaneous emission is very intensive. Further confirmation of lasing onset using narrowing of the full width at half maximum and annihilation of the Purcell-enhanced spontaneous emission is shown in Section III of the Supporting Information. , …”

Polarized Laser Switching with Giant Contrast in MOF‐Based Mixed‐Matrix Membrane

“…On the other hand, the hexagonal prism‐like resonator could provide polarization selection mechanism for WGMs feedback emission, resulting in the final anisotropic lasing output. [ 34 , 35 , 36 , 37 ]…”

Mapping of Fabry–Perot and whispering gallery modes in GaN microwires by nonlinear imaging

“…Hence, GaN MWs naturally suit potential applications as optical resonators [8,9] for integrated lasers [10,11] and sensors [6,12]. Previous studies have shown how GaN nanostructures can be used for confinement of whispering gallery (WGM) and Fabry-Perot (FPM) modes [13][14][15][16].…”

“…Hence, GaN MWs naturally suit potential applications as optical resonators [8,9] for integrated lasers [10,11] and sensors [6,12]. Previous studies have shown how GaN nanostructures can be used for confinement of whispering gallery (WGM) and Fabry-Perot (FPM) modes [13][14][15][16]. Optical resonators supporting WGM can be applied for cavity devices with exceptional properties such as small mode volume, high power density, and narrow spectral linewidth [12,17].…”