Comptes Rendus
no. 7-8
Frequency-agile terahertz-wave generation and detection using a nonlinear optical conversion, and their applications for imaging
[Systèmes de rayonnement térahertz, ajustables en fréquence, basés sur des effets optiques non linéaires, et leurs applications en imagerie]
Hiroaki Minamide1  ; Hiromasa Ito1, 2
1 RIKEN Advanced Science Institute, 519-1399 Aramaki Aoba, Sendai, Miyagi, 980-0845, Japan
2 Graduate School of Engineering, Tohoku University, Aramaki Aoba, Sendai, Miyagi, 980-8579, Japan
Comptes Rendus. Physique, Volume 11 (2010) no. 7-8, pp. 457-471.

Nous avons développé des sources de rayonnement térahertz basées sur des techniques d'optique non linéaire, qui sont réglables sur une très large bande fréquentielle. Dans la région 1–3 THz, nous avons construit un oscillateur paramétrique comprenant un cristal non linéaire de LiNbO3 dopé MgO au sein d'une cavité résonante en anneau. Pour la génération très large bande (1–40 THz), le cristal organique DAST (4-dimethylamino-N-methyl-4-stilbazolium tosylate) présente des performances très prometteuses. Ainsi, nous l'avons utilisé pour de la génération THz par différence de fréquence entre les 2 faisceaux délivrés par un oscillateur optique paramétrique en KTP (KTiOPO4). De plus, la technique non linéaire de « up-conversion » permet une détection des ondes THz avec une extrême sensibilité et un temps de réponse très bref à température ambiante. En employant ces sources, nous avons enregistré des cartes de concentration aqueuse de tissus biologiques et des cartes de densité de charges libres dans des semi-conducteurs.

We have developed widely tunable terahertz (THz)-wave sources using nonlinear optical crystals. In the 1–3 THz region, a frequency-agile THz-wave parametric oscillator in a ring-cavity configuration has been realized using MgO-doped LiNbO3 as the nonlinear crystal. An organic 4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) crystal is promising for THz-wave generation in an ultra-wide range 1–40 THz. Difference-frequency generation from DAST, pumped using a dual-wavelength KTiOPO4 (KTP) optical parametric oscillator, is demonstrated. Additionally, THz-wave detection, with high sensitivity, fast response-time and room-temperature operation, is achieved by nonlinear up-conversion. Water concentration mapping of biological tissue samples and carrier density mapping of semiconductor wafers using frequency-agile THz-wave sources are demonstrated.

Publié le :
DOI : 10.1016/j.crhy.2010.05.005
Keywords: Terahertz-wave parametric oscillation/generation, Difference frequency generation, Widely tunable source, Terahertz-wave detection, Nonlinear optical conversion, Carrier density mapping, Water concentration mapping
Mot clés : Oscillation/génération térahertz paramétrique, Génération par différence de fréquence, Génération très large bande, Détection des ondes THz, Conversion optique non linéaire, Carte de densité de charges libres, Carte de concentration aqueuse
Hiroaki Minamide 1 ; Hiromasa Ito 1, 2

1 RIKEN Advanced Science Institute, 519-1399 Aramaki Aoba, Sendai, Miyagi, 980-0845, Japan
2 Graduate School of Engineering, Tohoku University, Aramaki Aoba, Sendai, Miyagi, 980-8579, Japan 
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Hiroaki Minamide; Hiromasa Ito. Frequency-agile terahertz-wave generation and detection using a nonlinear optical conversion, and their applications for imaging. Comptes Rendus. Physique, Volume 11 (2010) no. 7-8, pp. 457-471. doi : 10.1016/j.crhy.2010.05.005. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2010.05.005/

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