scholarly journals Intra-pulse difference-frequency generation of mid-infrared (27–20  μm) by random quasi-phase-matching

2019 ◽  
Vol 44 (12) ◽  
pp. 2986 ◽  
Author(s):  
Jinwei Zhang ◽  
Kilian Fritsch ◽  
Qing Wang ◽  
Ferenc Krausz ◽  
Ka Fai Mak ◽  
...  
Keyword(s):  
Difference Frequency Generation ◽  
Difference Frequency ◽  
Phase Matching ◽  
Mid Infrared ◽  
Quasi Phase Matching ◽  
Frequency Generation

Efficient Terahertz Surface-Emitted Difference Frequency Generation in Periodically-Inverted GaAs Crystals

2011 ◽  
Vol 301-303 ◽  
pp. 334-337 ◽  
Author(s):  
Zhi Ming Rao ◽  
Zhi Fang He ◽  
Jian Qiang Du
Keyword(s):  
Wave Propagation ◽  
Pump Wave ◽  
Nonlinear Crystal ◽  
Difference Frequency Generation ◽  
Grating Period ◽  
Difference Frequency ◽  
Phase Matching ◽  
Thz Wave ◽  
Quasi Phase Matching ◽  
Frequency Generation

We explore the terahertz (THz) wave generation based on surface-emitted difference frequency generation (SEDFG) in periodically-inverted GaAs crystals. One scheme applying collinear quasi phase matching (QPM) is proposed. The wave propagation of the higher frequency pump wave is parallel to the wave propagation of the lower frequency pump wave, and both of them are perpendicular to the domain wall of the nonlinear crystal. The THz wave is emitted perpendicular to the surface of the nonlinear crystal. We calculated the grating period of periodically-inverted GaAs at the range of 100-1000μm (0.3-3THz). Our estimates illustrate that THz wave output corresponds to the power conversion efficiency of 0.015% at a frequency of 1THz. The result is shown that this scheme is efficient to obtain THz wave.

Theoretical Analysis of Efficient Terahertz Difference Frequency Generation in Periodically-Inverted GaAs Crystals

2014 ◽  
Vol 1015 ◽  
pp. 264-267
Author(s):  
Zhi Ming Rao ◽  
Fang Sen Xie ◽  
Zhi Fang He
Keyword(s):  
Difference Frequency Generation ◽  
Uniaxial Crystal ◽  
Second Order ◽  
Difference Frequency ◽  
Nonlinear Susceptibility ◽  
Phase Matching ◽  
High Power Conversion Efficiency ◽  
Thz Wave ◽  
Quasi Phase Matching ◽  
Frequency Generation

This paper reports the analysis of efficient terahertz (THz) wave generation on the basis of quasi phase matching (QPM) difference frequency generation (DFG) in periodical GaAs by CO2laser. The efficient second-order nonlinear susceptibility of GaAs was calculated by similar to the calculation it of uniaxial crystal. We calculated second-order nonlinear susceptibility for the incidence two pump lights with the same propagation directions. The result shown that, the incidence two pump lights with the perpendicular polarization directions and the same polarization directions were efficient to obtain high power conversion efficiency of THz wave.

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