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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 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 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.
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.
By investigating dependence of THz output power on pump polarization, ratios of elements for second-order nonlinear susceptibility tensor have been measured for GaSe, which significantly deviate from those dictated by Kleinmanpsilas symmetry and structural symmetry.
We demonstrate that a widely-tunable far-IR source developed by us recently can be used to identify weak inversion and inversion-rotational transitions within the nu2=1 excited state of NH3 molecule. Seven transition peaks have been observed.
By removing negative differential conversion efficiencies for THz generation, observed on InP, we have increased the THz output power by one order of magnitude, making InP comparable to ZnTe and InAs as highly efficient emitter.
For the first time we have measured the spectrum of two-photon absorption coefficient for GaAs based on Z-scan technique. We have observed a peculiar feature in the spectrum and compared our results with the two previous discrete values.
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