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We realize a new scheme for making a direct contact to a two-dimensional (2D) nanorod LED array using the oblique-angle deposition. More importantly, we demonstrate highly efficient carrier injection into the nanorods.
Novel approach to improve light extraction efficiency of InGaN-based light emitting diodes with polydimethylsiloxane concave microstructures arrays was demonstrated, which leads to enhancement of extraction efficiency by 1.60-times in good agreement with simulation.
We report a pulsed, fully-fiberised, Yb-doped MOPA with a maximum average output power of 100 W. Adaptive pulse shaping was incorporated to reduce the impact of nonlinearities, delivering 2mJ flat-topped pulses with 20 kW peak power.
126 mW visible light were generated by frequency doubling using bulk PPLN in a high finesse ring cavity pumped by a BAL ECDL. The locking between the two cavities is managed purely optical.
We have generated the backward terahertz pulses with record-high average powers of 2.3-11 muW and narrowest bandwidth of 6 GHz from multi-grating periodically-poled lithium niobate by optical rectification at room temperature.
Slope efficiency as high as 80% has been achieved in Tm:fiber laser end-pumped adhesive free bonded (AFB) YAG/Ho:YAG/YAG laser composite. 18.7-W output power at 2.09 mum has been achieved at pump power of 24.3 W.
Efficient 1.34-mum laser emission is realized in Nd-vanadates under pumping with diode lasers at 0.88 mum. A Nd:YVO4 crystal yielded 3.4-W output power for 9.3-W absorbed pump power, at a slope efficiency of 0.43.
Power scaling by combining 885 nm upper laser level Nd:YAG pumping and multi-segmented laser rods is presented. An output power of 750 W (optical-to-optical efficiency of 58%) was demonstrated using polarization coupled diode stack pumping.
We have succsessfully developed blue-violet laser diodes having the world's highest output power of 450 mW by introducing a novel facet coating structure, reducing the internal loss in devices, and making a cavity length long.
We report on reliability of deep UV (DUV) LEDs with wavelengths ranging from 235 nm to 310 nm. For longer wavelength DUV LEDs, the operation lifetime (50% decrease of output power) exceeds 5,000 hours. The current-voltage characteristics and the emission spectrum remain nearly unchanged during the degradation process. The degradation is sensitive to the operating temperature. The low frequency noise...
We have investigated light-current characteristics of terahertz quantum cascade lasers under external light injection. The light injection induces the modulation of the output power that is explained by the characteristic properties of the laser.
We report the first waveguide laser based on rare-earth sesquioxides. A structured Nd(0.5%):(Gd, Lu)2O3 film pumped at 820 nm showed lasing at 1.08 mum. The laser threshold was 0.8 mW, the preliminary slope efficiency 0.5% and the maximum output power 1.8 mW.
Distinctive indium-tin-oxide nanorods are demonstrated using glancing-angle deposition. The nanostructured material exhibit enhanced transmission and is employed to enhance the light-output-power of GaN/InGaN vertical-injection light emitting diodes by 20% at an injection current of 350 mA.
We report on the first OP-GaAs OPO directly pumped by a 2.09 mum fiber laser. Up to 0.6 W average output power was achieved at 20 kHz repetition rate in the mid-infrared range.
VBGs can efficiently be used to mitigate the spectrally broad output from cryogenically cooled Yb-fiber lasers. We extract 11.5-W of output power in spectral window of less than 0.4-nm with 14.5-W of launched pump light.
We demonstrated 222-282 nm AlGaN and InAlGaN-based efficient deep-ultraviolet (DUV) light-emitting diodes (LEDs) fabricated on low threading dislocation density (TDD) AlN. We achieved over 10 mW CW UV output power for 264-282 nm LEDs.
By varying the length of a flat-flat cavity, polarization selective operation of a Nd:YAG laser was achieved only in a stable region of either TM01 or TE01 mode based on cavity stability incorporating thermally effects.
We demonstrated over 100-nm RGB tunable laser operation (479-497, 515-546, 597-650 nm) using a single 9-cm Pr3+-doped ZBLAN fiber pumped by a GaN-LD. The optimized laser cavity at 635 nm realized slope efficiency of 0.69.
An injectorless quantum cascade laser design, using two 0.6 nm InAs spikes within the active zone, yielding shorter wavelength and improved performance is presented. The average pulsed output power was measured to 880 mW at 297 K.
We present a mid-infrared frequency comb based on a synchronously-pumped, femtosecond optical parametric oscillator. The idler (signal) is continuously tunable from 2.8-4.8 mum (1.76-1.37 mum) with a maximum average output power of 1.50 W.
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