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•Exploration of internet addiction in the largest population of internet users: Chinese adolescents.•Internet addiction was correlated with high-risk sexual attitudes and past sexual experience in adolescents.•Increasing information in this understudied area of health-risk behaviors may improve adolescent health programs.
Different gases have been successfully fingerprinted on the basis of the distinct transition frequencies measured by frequency tuning a THz source developed by us. Our further analysis illustrates that one can reliably separate isotopologues by measuring and comparing their rotational constants. Based on our investigation of the N2O isotopologues, 29 rotational transition peaks were identified for...
We used pump-probe technique to investigate recombination dynamics of photogenerated carriers in photodiodes consisting of InAs/GaInSb W-structured superlattices. Recombination time constants of 1.6 ns and 10 ns were measured under high and low powers, respectively.
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.
We observed that photoluminescence intensities clamped at certain values as the pump intensity was increased, due to the presence of nonlinear degenerate electron gas and saturation of photogenerated and localized holes in InN.
We show that the retracing behavior based in slant-stripe-type periodically-poled RbTiOPO4 can be used to efficiently achieve second-harmonic generation within an ultra-wide spectral range of 1.7-4.0 mum.
Phonon-assisted anti-Stokes fluorescence has been observed in GaN film grown on Si (111) substrate. The donor-acceptor pairs and bound excitons have played primary roles in the generation of anti-Stokes fluorescence.
We have observed blue and red Stark shifts of two excitonic transition peaks in multiple GaN/AlN asymmetric coupled quantum wells due to increases in electric fields originating from spatial separation of photogenerated electrons and holes.
We have identified 68 rotational transitions from three isotopic variants of nitrous oxide, among which 29 were never observed previously. By deducing and comparing the rotational constants, we have reliably differentiated among three isotopic variants.
Mechanisms for anti-Stokes photoluminescence observed at room temperature from n-type free-standing GaN grown by MOCVD have been attributed by us to the competition between two-photon absorption and phonon-assisted absorption.
THz average output power as high as 2.4 microwatts is generated from InN films, with the mechanism being the interference between optical rectification and photocurrent surge.
The average terahertz output power generated from stacked GaAs wafers using two CO2 lasers is scaled up by 160. The highest average output power is measured to be 29.8 muW by stacking ten wafers.
We have efficiently generated coherent mid-infrared pulses at 3.42 mum by mixing a CO2 laser beam with its second-harmonic output beam in a CdSe crystal with the output peak power as high as 39.2 W.
We efficiently generated ultrafast coherent ultraviolet radiation based on second harmonic generation in periodically-poled KTiOPO4 with the shortest period of 2.55 mum. The highest output power was measured to be 20.1 mW at 377.1 nm.
Frequency mixing in nonlinear crystals corresponds to one of the efficient schemes for generating coherent THz pulses from intense laser beams. Recently, difference-frequency-generation (DFG) using coherent pulses at 1 mum was investigated in a few nonlinear materials; the highest peak power generated so far is 390 W. However, the average output power was still limited to 20 muW. In order to further...
In this work, we present our new findings following our studies of the THz generation from InGaN/GaN multiple quantum wells (MQW's), pumped by a frequency-doubled sub-picosecond Ti:sapphire amplifier at the output wavelength of 395 nm. For the pump power of 320 mW, an average output power of 32 nW was measured in the frequency range of 300 GHz - 4.28 THz. Based on the photo luminescence (PL) spectra...
We show a metallic graded grating structure is able to achieve the function of ldquotrapped rainbowrdquo storage of light at both THz and telecom frequencies for potential nanophotonic applications including optical communications.
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