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- W2188998597 abstract "Planar photonic crystal microcavity hasa conventional cavity structure whichisusedtoenhance photoluminescence. However, thedivergence angle oftheemitted laser beamfromaplanar microcavity with amicrometer-thick defect layer isgenerally verylarge because thelocalization oflight inonedimension cannot totally suppress themodesinother directions, andthecavity quality factor Q ofsuchdevices islow(100)and determined thoroughly bythereflectivity ofthedistributed Braggreflector (DBR). Recently, weproposed anew cavity structure whichwas a hybrid cavity combining a planar photonic crystal microcavity and atwo-dimensional randomcavity defect layer [1]. Inthenewdeveloped microcavity structure, photons inside thehybrid cavity aretrapped 3-dimensionally. Therefore, optical modesofthecavity weresignificantly reduced. Consequently, thelaser threshold, divergence angle ofemitted laser beam, andthespectral linewidth ofthelaser emission wassubstantially reduced bytwo-fold confinement effects fromtransverse random cavities andvertical planar microcavity. Inthis paper, wedemonstrated awavelength tunable planar random microcavity laser. We useddyedoped liquid crystal asthegain layer sothat thedefect modeposition canbeeasily tuned bychanging temperature. We reported anearly single modeultra-narrow linewidth laser emission fromtheoptically pumpedhybrid cavity structure. The0.03nm linewidth (corresponding toQ>20000) isabout twoorders ofmagnitude narrower than thatfroma conventional planar microcavity. Tunable randomlaser emission was observed when theenvironment temperature wasslightly increased. Fig. lashows typical spectra fromaplanar random microcavity atdifferent temperatures. Tworesonant modes corresponding toordinary (ko) andextraordinary light (2e) polarization could beclearly observed at25'C.They shifted continuously whenthetemperature increased from27to34'C.At34.5 'Cwhichisovertheclearing point of5CB,birefringence disappeared, bothkoandk,jumped to613.4 nm.Bycarefully control thesize of pumping area, theemitted laser waskept assingle narrow linewidth lasing modeduring thewhole temperature tuning process. Fig. lbplots together thetemperature dependence ofthecalculated andmeasured resonant mode wavelength forordinary andextraordinary light polarizations, thecalculated results matchwellwith themeasured results. 345'C a 000 b" @default.
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- W2188998597 date "2007-01-01" @default.
- W2188998597 modified "2023-09-24" @default.
- W2188998597 title "Tunable High-QDirectional RandomLaserfrom aPlanar RandomMicrocavity" @default.
- W2188998597 hasPublicationYear "2007" @default.
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