Dynamic and rapid spectral shifts of whispering-gallery mode (WGM) from microdisk laser were studied. The microdisks with diameter about 100 μm were fabricated by ink-jet printing of Rhodamine 590 doped polymer. Sharper edge microdisk and rounder edge microdisk were pumped with Q-switched Nd:YAG laser(@532 nm). A spectral shift −3.77×10-3 nm/(μJ·mm-2) was occurred in the case of the rounder edge microdisk, which is smaller than the spectral shift −4.21×10-3 nm/(μJ·mm-2) in the case of the sharper edge microdisk. Expecting the anomalous dispersion and Rhodamine 590 degradation affect, under the same excitation condition, the WGM spatial modification can also led to the shifts. And the modification was caused by interaction between the sharpened-edge and the increased optical gain.
Novel microdisk optical 3D structure fabrication was demonstrated in a room temperature and atmospheric condition with tens-seconds processing duration. This additive manufacturing scheme of polymeric microdisk was based on the ink-jet technique with hyperbranched polymer TZ-001. And whispering-gallery mode (WGM) lasing with a low threshold was confirmed by doping LDS798 or Rhodamine 590 dyes. The diameters both 75 µm were archived. The WGM lasing at around 800 nm wavelength by the LDS798, and at around 600 nm by the Rhodamine 590. Low lasing threshold about 2~3 µJ/mm2 were confirmed. And shift of peak wavelength was observed on the Rhodamine590:TZ-001 disk.