Continuous Wave Terahertz Signal Generator based on Difference Frequency Generation in Gallium Phosphide crystal and its applications for spectroscopy

2016 ◽  
Author(s):  
Tetsuo Sasaki ◽  
Tadao Tanabe ◽  
Tomoaki Sakamoto ◽  
Jun-ichi Nishizawa
Keyword(s):  
Gallium Phosphide ◽  
Continuous Wave ◽  
Difference Frequency Generation ◽  
Signal Generator ◽  
Difference Frequency ◽  
Frequency Generation ◽  
Terahertz Signal

Recent Progress of GaP THz Signal Generator - Light Source for High Accurate Terahertz Spectrometer

2015 ◽  
Vol 1117 ◽  
pp. 118-121
Author(s):  
Tetsuo Sasaki ◽  
Tadao Tanabe ◽  
Junichi Nishizawa
Keyword(s):  
Light Source ◽  
Recent Progress ◽  
Continuous Wave ◽  
Difference Frequency Generation ◽  
Signal Generator ◽  
Difference Frequency ◽  
First Report ◽  
Thz Wave ◽  
Frequency Generation

We have developed a continuous wave THz Signal Generator on the principle of Difference Frequency Generation in a GaP crystal and constructed a high accurate CW THz spectrometer using it as a light source. Combining with a bolometer detector cooled by a mechanical cooler, the spectrometer is now working as non-stop system. Increasing the power of CW THz wave up to 100 nW, uncooled detector or camera is now available. This is the first report of CW THz beam observation generated at the surface of GaP crystal.

Theoretical analysis of terahertz generation in periodically inverted nonlinear crystals based on cascaded difference frequency generation process

2015 ◽  
Vol 29 (02) ◽  
pp. 1450263 ◽  
Author(s):  
Chen-Fei Hu ◽  
Kai Zhong ◽  
Jia-Lin Mei ◽  
Mao-Rong Wang ◽  
Shi-Bei Guo ◽  
...  
Keyword(s):  
Gallium Phosphide ◽  
Wave Equations ◽  
Difference Frequency Generation ◽  
Pump Intensity ◽  
Difference Frequency ◽  
Generation Process ◽  
Coupled Wave Equations ◽  
Wave Vector Mismatch ◽  
Frequency Generation ◽  
Absorption Wave

The characteristics of terahertz (THz) generation based on cascaded difference frequency generation (DFG) process in periodically inverted gallium arsenide ( GaAs ) and gallium phosphide ( GaP ) is calculated from coupled wave equations, in which the output enhancement factors are 5.4 and 3.9 in the two crystals, respectively, compared with DFG without cascading. The optimal interaction length, influence of crystal absorption, wave vector mismatch and pump intensity are analyzed. A short discussion on wavelength tuning is also given. The calculated optimal operating parameters and conclusions can provide good directions for the experimental design.

Investigation of Conversion Efficiency of Widely Tunable Continuous-Wave Mid-IR Difference Frequency Generation Fiber-type Laser

2008 ◽  
Vol 28 (2) ◽  
pp. 295-300
Author(s):  
蒋建 Jiang Jian ◽  
李晓芹 Li Xiaoqin ◽  
冯素娟 Feng Sujuan ◽  
王执山 Wang Zhishan ◽  
毛庆和 Mao Qinghe ◽  
...  
Keyword(s):  
Conversion Efficiency ◽  
Continuous Wave ◽  
Fiber Type ◽  
Difference Frequency Generation ◽  
Difference Frequency ◽  
Frequency Generation
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