Difference frequency generation in the mid-infrared with orientation-patterned gallium phosphide crystals

2016 ◽  
Vol 41 (21) ◽  
pp. 5114 ◽  
Author(s):  
Giacomo Insero ◽  
Cecilia Clivati ◽  
Davide D’Ambrosio ◽  
Paolo De Natale ◽  
Gabriele Santambrogio ◽  
...  
Keyword(s):  
Gallium Phosphide ◽  
Difference Frequency Generation ◽  
Difference Frequency ◽  
Mid Infrared ◽  
Frequency Generation

scholarly journals Spectroscopic Imaging with an Ultra-Broadband (1–4 THz) Compact Terahertz Difference-Frequency Generation Source

Electronics ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 336
Author(s):  
Atsushi Nakanishi ◽  
Shohei Hayashi ◽  
Hiroshi Satozono ◽  
Kazuue Fujita
Keyword(s):  
Imaging Technique ◽  
Spectroscopic Imaging ◽  
Difference Frequency Generation ◽  
Difference Frequency ◽  
Quality Monitoring ◽  
Terahertz Emission ◽  
Mid Infrared ◽  
Quantum Cascade ◽  
Frequency Generation ◽  
Multi Mode

We demonstrate spectroscopic imaging using a compact ultra-broadband terahertz semiconductor source with a high-power, mid-infrared quantum cascade laser. The electrically pumped monolithic source is based on intra-cavity difference-frequency generation and can be designed to achieve an ultra-broadband multi-mode terahertz emission spectrum extending from 1–4 THz without any external optical setup. Spectroscopic imaging was performed with three frequency bands, 2.0 THz, 2.5 THz and 3.0 THz, and as a result, this imaging technique clearly identified three different tablet components (polyethylene, D-histidine and DL-histidine). This method may be highly suitable for quality monitoring of pharmaceutical materials.

scholarly journals Flexible Electro-Optic, Single-Crystal Difference Frequency Generation Architecture for Ultrafast Mid-Infrared Dual-Comb Spectroscopy

ACS Photonics ◽  
2018 ◽  
Vol 5 (6) ◽  
pp. 2348-2353 ◽  
Author(s):  
Borja Jerez ◽  
Pedro Martín-Mateos ◽  
Frederik Walla ◽  
Cristina de Dios ◽  
Pablo Acedo
Keyword(s):  
Single Crystal ◽  
Difference Frequency Generation ◽  
Difference Frequency ◽  
Mid Infrared ◽  
Electro Optic ◽  
Frequency Generation

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.

scholarly journals Widely-tunable mid-infrared frequency comb source based on difference frequency generation

2012 ◽  
Vol 37 (12) ◽  
pp. 2232 ◽  
Author(s):  
Axel Ruehl ◽  
Alessio Gambetta ◽  
Ingmar Hartl ◽  
Martin E. Fermann ◽  
Kjeld S. E. Eikema ◽  
...  
Keyword(s):  
Frequency Comb ◽  
Difference Frequency Generation ◽  
Difference Frequency ◽  
Mid Infrared ◽  
Frequency Generation

Mid-infrared multi-mode absorption spectroscopy, MUMAS, using difference frequency generation

2014 ◽  
Vol 118 (3) ◽  
pp. 343-351 ◽  
Author(s):  
Henry Northern ◽  
Seamus O’Hagan ◽  
Michelle L. Hamilton ◽  
Paul Ewart
Keyword(s):  
Absorption Spectroscopy ◽  
Difference Frequency Generation ◽  
Difference Frequency ◽  
Mid Infrared ◽  
Frequency Generation ◽  
Multi Mode
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