Abstract:We report a vertical microcavity dye laser consisting of a polymeric active random layer doped with silica nanoparticles whose diameters are approximately 100 nm. Pumped by an InGaN-based blue-violet laser diode with pulse duration of 3 ns, single mode laser oscillation was obtained at a wavelength of 530 nm. The threshold pump power decreased from 70 mW/pulse to 49 mW/pulse by adding nanoparticles to the active layer. We found an optimum particle density of 2×10 13 cm −3 by measuring threshold pump power to change depending on the particle density in the activity layer.

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a = 10 cm, e? = 2.32 AND h = 0.159 cm Mode ? , O , -l Y J i -2 1M2,0,-2 ?M2, 1 -3 1M3,0,-3 1280 2242 2550 3400 3824 the correction factor for the resonant frequencies of the-equilateral triangular patch antenna consists of a simple replacement af the side1ength.a by its effective value given by (2) while E , is unchanged. This is similar to that of the circular disk and different from that of the annular ring. REFERENCES [l] L. experiment on the annularring microstrip antenna," Ann. Telecommun., tome 40, nos. 9-10, [4] M. V. Schneider, "Microstrip lines for microwave integrated circuits," , "Planar t r i a n g u l a r resonator with magnetic walls," IEEE Trans. Microwave Theory Tech., vol. MTT-[6] I.Abstract-The fields predicted by integration of the physical optics induced currents on the reflector (ICM) and the geometrical optics Manuscript aperture fields (AFM) on the surface that caps the reflector are compared numerically for offset parabolic reflectors. It is found that the AFM solutions are very close to ICM solutions for the main beam and the first few sidelobes but discrepancy remains for the far-out sidelobes. This discrepancy is found to come mainly from the difference of polarization matrix for each method.

We report the lasing characteristics of solid-state dye lasers that contain two mixed dyes. Pyrromethene 567 (P567) or rhodamine 6G (Rh6G) was codoped with coumarin 540A (C540A) as an acceptor dye. Using a 406-nm-laser diode as a pump source, we obtained energy transferred laser oscillations in the range of 550 590 nm with a C540A/P567 codoped laser and in the range of 560 600 nm with a C540A/ Rh6G codoped laser. The threshold pump power was reduced, and the durability of the lasers was improved by incorporating the two different dyes.