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Zhao P.,Lehigh University | Ragam S.,Lehigh University | Ding Y.J.,Lehigh University | Zotova I.B.,ArkLight, Inc
Optics Letters | Year: 2010

We have demonstrated a compact and portable terahertz (THz) source, based on difference-frequency generation in a GaSe crystal. The two input frequencies, required for achieving frequency mixing, are generated by a single Qswitched Nd:YLF laser incorporating two laser resonators. The average power of the THz output reaches 1 ìW at 1:64 THz (182 ìm) within a linewidth of 65 GHz. Such a THz source can be packaged into a compact and portable system. © 2010 Optical Society of America. Source


Li D.,Lehigh University | Jiang Y.,Lehigh University | Ding Y.J.,Lehigh University | Zotova I.B.,ArkLight, Inc | Prasad N.S.,NASA
Applied Physics Letters | Year: 2012

We have implemented a single-photon detection system in the 1.55-μm region, based on frequency up-conversion in MgO-doped periodically poled LiNbO 3 waveguide. We have subsequently reached a record-low dark count rate of 45 counts per second. The detectable signal photon rate, i.e., the rate for counting the up-converted photons corrected by the dark counts, noises, and losses, reaches a record-low value of 81 photons per second. Through free-space coupling, we have eliminated the dark counts induced by parametric fluorescence. © 2012 American Institute of Physics. Source


Zhao P.,Lehigh University | Ragam S.,Lehigh University | Ding Y.J.,Lehigh University | Zotova I.B.,ArkLight, Inc
Applied Physics Letters | Year: 2012

We demonstrate intracavity terahertz generation from an output coupler of a compact dual-frequency solid state laser. The output coupler consisting of unbonded and stacked GaP plates is used as a second-order nonlinear medium where the difference-frequency generation takes place. When quasi-phase matching is achieved within the alternatively rotated GaP plates, terahertz output power is significantly enhanced compared with that for the corresponding external-cavity configuration. © 2012 American Institute of Physics. Source


Zhao P.,Lehigh University | Ragam S.,Lehigh University | Ding Y.J.,Lehigh University | Zotova I.B.,ArkLight, Inc
Optics Letters | Year: 2011

When two Nd:YLF crystals share a Cr:YAG crystal functioning as a single passive Q switch, the timing jitter between each pair of dual-frequency pulses generated by the two crystals has been reduced by a factor of 20. Such a reduction in the timing jitter allows us to generate terahertz pulses by focusing such a passively Q-switched laser beam onto a nonlinear crystal. Such a result represents the first step for us to eventually implement a compact terahertz source based on ultracompact microchip lasers. © 2011 Optical Society of America. Source


Jiang Y.,Lehigh University | Li D.,Lehigh University | Ding Y.J.,Lehigh University | Zotova I.B.,ArkLight, Inc
Optics Letters | Year: 2011

By stacking alternatively rotated gallium phosphide (GaP) plates, the maximum photon conversion efficiency of 40% for the terahertz (THz) generation based on difference-frequency generation has been achieved. The corresponding peak power generated inside the four GaP plates approaches 4kW. As the number of plates is increased from four to five, the THz output power is significantly decreased, due to back parametric conversion. © 2011 Optical Society of America. Source

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