a), Development of Measurement and Analysis Techniques Using Terahertz Waves and Their Sources Kei TAKEYA a), Hiroyo OKANO, Saroj R. TRIPATHI, and Kod

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1 a), Development of Measurement and Analysis Techniques Using Terahertz Waves and Their Sources Kei TAKEYA a), Hiroyo OKANO, Saroj R. TRIPATHI, and Kodo KAWASE, ( ) 1. (THz) [1] [3] 30 µm 3mm 0.1 THz 10 THz Graduate School of Engineering, Nagoya University, Furocho, Chikusa-ku, Nagoya-shi, Japan RIKEN, Sendai-shi, Japan a) takeya@nuee.nagoya-u.ac.jp µev mev X [1] [3] [4] [6] [7] 420 C Vol. J97 C No. 11 pp c 2014

2 [8] X 2. [8] [12] 1 4-Dimethylamino-N-methyl 4-stilbazolium tosylate (DAST) (GaAs) (PCA) 1.56 µm 17 fs DAST [8], [11], [12] µm µm 5 µm 1.9 n 10/n µm [8] 2 90 µm 1 Fig. 1 Principle of time-of-flight terahertz tomography D Fig. 2 3D terahertz tomography image of three sheets of paper. 421

3 2014/11 Vol. J97 C No mm 10 mm 10 µm 3. DAST [4], [13], [14] [15] PCA [16] [23] PCA PCA PCA (LiNbO 3) (ZnTe) DAST LiNbO 3 3 Fig. 3 Experimental setup used to measure the THz average power using a pyroelectric detector. [6] DAST [24], [25] [26] [28] 2 DAST PCA [5] 3 DAST 5 5mm mm IMRA America HFX-400 ( nm 65 fs 67.1 MHz 300 mw) DAST 50.8 mm 60 µm 2.44 GW/cm 2 2 PCA PCA Gentec PI-A-65THz 4 2 THz 7THz 1.1 THz 5.2 THz DAST [28] 7 THz 422

4 4 (a) DAST (b) Fig. 4 (a) Time domain THz electric field, (b) its intensity spectrum. 5 Fig. 5 Dependence of THz average power on laser input power. PCA GaAs [29], [30] EO 7THz [31] mw 18 µw DAST 1.6 µm [11], [27] DAST DAST [32] DAST PCA PCA (InSb) (QMC ) PCA 10 V 805 nm 67.1 MHz 130 fs 10 mw 3 PCA 70 nw DAST DAST PCA 257 DAST PCA DAST PCA PCA DAST DAST 4(a) DAST DAST [12] [8] 423

5 2014/11 Vol. J97 C No [8] LiNbO 3 [33] LiNbO 3 [34], [35] LiNbO 3 [6], [36], [37] 6(a) ( 6(b)) LiNbO 3 [38] µm (5%MgO LiNbO µm 5 µm 10 mm) 8 µm 6 (a) (b) Fig. 6 (a) Ideal Cherenkov-type phase matching condition, (b) Cherenkov-type phase matching condition when the beam diameter of the exciting light is considered. In (b), the phase mismatch is caused by the finite size of the beam diameter. 7 Fig. 7 Diagram of the experimental setup for waveguide crystal. 3.5 µm PET (Infrared Lab. ) 8 PCA GaAs 780 nm 15 mw 10 V 2 [34]

6 8 PCA 100 Fig. 8 THz output measured by a Si bolometer. The data for the PCA were multiplied by 100 for clarity. 10 ( ) ( ) PCA Fig. 10 Output image of generated THz waves using THz camera: (upper) ridge waveguide, (lower) PCA. 9 (a) (b) Fig. 9 (a) Temporal pulses and (b) spectrum from TDS measurement. GaAs-PCA PCA (PPLN) 9 DAST 1/ fs 0.1 THz 7THz 50 db (SNR) (NEC IRV- T0831) 10 PCA PCA PCA 5. DAST DAST 17fs 425

7 2014/11 Vol. J97 C No. 11 n 10/n µm DAST PCA THz 50 db SNR JST JSPS S Shuzhen Fan [1] M. Tonouchi, Cutting-edge terahertz technology, Nat. Photonics, vol.1, pp , Feb [2] [3] X.-C. Zhang and J. Xu, Introduction to THz Wave Photonics, Springer, Berlin, [4] S. Hayashi, K. Nawata, H. Sakai, T. Taira, H. Minamide, and K. Kawase, High-power, single-longitudinal-mode terahertz-wave generation pumped by a microchip Nd:YAG laser, Opt. Express, vol.20, issue 3, pp , Jan [5] S.R. Tripathi, K. Murate, H. Uchida, K. Takeya, and K. Kawase, A fiber-laser pumped, high-power terahertz wave source based on optical rectification of femtosecond pulses in 4-dimethylamino-N-methyl-4- stilbazolium tosylate crystal, Appl. Phys. Express, vol.6, , [6] K. Takeya, K. Suizu, H. Sai, T. Ouchi, and K. Kawase, IEEE J. Sel. Top. Quantum Electron., vol.19, , [7] vol.89, no.6, pp , June [8] J. Takayanagi, H. Jinno, S. Ichino, K. Suizu, M. Yamashita, T. Ouchi, S. Kasai, H. Ohtake, H. Uchida, N. Nishizawa, and K. Kawase, Highresolution time-of-flight terahertz tomography using a femtosecond fiber laser, Opt. Express, vol.17, issue 9, pp , [9] K. Kawase, Y. Ogawa, Y. Watanabe, and H. Inoue, Non-destructive terahertz imaging of illicit drugs using spectral fingerprints, Opt. Express, vol.11, issue 20, pp , [10] Y. Watanabe, K. Kawase, T. Ikari, H. Ito, Y. Ishikawa, and H. Minamide, Component spatial pattern analysis of chemicals using terahertz spectroscopic imaging, Appl. Phys. Lett., vol.83, no.4, pp , [11] J. Takayanagi, S. Kanamori, K. Suizu, M. Yamashita, T. Ouchi, S. Kasai, H. Ohtake, H. Uchida, N. Nishizawa, and K. Kawase, Generation and detection of broadband coherent terahertz radiation using 17-fs ultrashort pulse fiber laser, Opt. Express, vol.16, issue 17, pp , [12] vol.38, no.2, pp , Feb [13] K. Kawase, H. Minamide, K. Imai, J. Shikata, and H. Ito, Injection-seeded terahertz-wave parametric generator with wide tunability, Appl. Phys. Lett., vol.80, pp , [14] S.R. Tripathi, Y. Taira, S. Hayashi, K. Nawata, K. Murate, H. Minamide, and K. Kawase, Terahertz wave parametric amplifier, Opt. Lett., vol.39, issue 6, pp , [15] B.S. Williams, S. Kumar, Q. Hu, and J.L. Reno, High-power terahertz quantum-cascade lasers, Electron. Lett., vol.42, issue 2, pp.89 91, Jan [16] H. Hirori, A. Doi, F. Blanchard, and K. Tanaka, Single-cycle terahertz pulses with amplitudes exceeding 1 MV/cm generated by optical rectification in LiNbO 3, Appl. Phys. Lett., vol.98, , [17] D.H. Auston, K.P. Cheung, and P.R. Smith, Picosecond photoconducting Hertzian dipoles, Appl. Phys. Lett., vol.45, pp , [18] M. Tani, S. Matsuura, K. Sakai, and S. Nakashima, Emission characteristics of photoconductive antennas based on low-temperature-grown GaAs and semiinsulating GaAs, Appl. Opt., vol.36, issue 30, pp , [19] T. Löffler, T. Hahn, M. Thomson, F. Jacob, and H.G. Roskos, Large-area electro-optic ZnTe terahertz emitters, Opt. Express, vol.13, issue 14, pp , July [20] P.Y. Han, M. Tani, F. Pan, and X.-C. Zhang, Use of the organic crystal DAST for terahertz beam applications, Opt. Lett., vol.25, issue 9, pp ,

8 [21] K. Suizu, K. Miyamoto, T. Yamashita, and H. Ito, High-power terahertz-wave generation using DAST crystal and detection using mid-infrared powermeter, Opt. Lett., vol.32, pp , Oct [22] T. Matsukawa, Y. Takahashi, R. Miyabara, H. Koga, H. Umezawa, I. Kawayama, M. Yoshimura, S. Okada, M. Tonouchi, Y. Kitaoka, Y. Mori, and T. Sasaki, Development of DAST-derivative crystals for terahertz waves generation, J. Cryst. Growth, vol.311, issue 3, pp , Jan [23] K. Takeya, Y. Takemoto, I. Kawayama, H. Murakami, T. Matsukawa, M. Yoshimura, Y. Mori, and M. Tonouchi, Terahertz emission from coherent phonons in lithium ternary chalcopyrite crystals illuminated by 1560 nm femtosecond laser pulses, EPL, vol.91, 20004, [24] F. Pan, G. Knöpfle, Ch. Bosshard, S. Follonier, R. Spreiter, M.S. Wong, and P. Günter, Electro-optic properties of the organic salt 4-N,N-dimethylamino- 4 -N -methyl-stilbazolium tosylate, Appl. Phys. Lett., vol.69, pp.13 15, [25] M. Jazbinsek, L. Mutter, and P. Gunter, Photonic applications with the organic nonlinear optical crystal DAST, IEEE J. Sel. Top. Quantum Electron., vol.14, issue 5, pp , [26] X.-C. Zhang, X.F. Ma, Y. Jin, T.-M. Lu, E.P. Boden, P.D. Phelps, K.R. Stewart, and C.P. Yakymyshyn, Terahertz optical rectification from a nonlinear organic crystal, Appl. Phys. Lett., vol.61, issue 26, pp , [27] A. Schneider, M. Stillhart, and P. Günter, High efficiency generation and detection of terahertz pulses using laser pulses at telecommunication wavelengths, Opt. Express, vol.14, issue 12, pp , [28] P.D. Cunningham and L.M. Hayden, Optical properties of DAST in the THz range, Opt. Express, vol.18, issue 23, pp , [29] E.D. Palik, Handbook of Optical Constants of Solid, Academic Press, New York, [30] S. Kasai, T. Katagiri, J. Takayanagi, K. Kawase, and T. Ouchi, Reduction of phonon resonant terahertz wave absorption in photoconductive switches using epitaxial layer transfer, Appl. Phys. Lett., vol.94, issue 11, pp , [31] M. Tani, K. Horita, T. Kinoshita, C.T. Que, E. Estacio, K. Yamamoto, and M.I. Bakunov, Efficient electro-optic sampling detection of terahertz radiation via Cherenkov phase matching, Opt. Express, vol.19, issue 21, pp , [32] H. Uchida, H. Ochiai, K. Suizu, T. Shibuya, and K. Kawase, Improving the laser-induced-damage tolerance characteristics of 4-dimethylamino-N-methyl-4- stilbazoliumtosylate crystals for THz wave generation by annealing, Jpn. J. Appl. Phys., vol.51, , [33] K.H. Yang, P.L. Richards, and Y.R. Shen, Generation of far - infrared radiation by picosecond light pulses in LiNbO 3, Appl. Phys. Lett., vol.19, issue 9, pp , [34] M.C. Hoffmann and J.A. Fülöp, Intense ultrashort terahertz pulses: generation and applications, J. Phys. D, vol.44, no.8, , [35] C. Zhang, Y. Avetisyan, A. Glosser, I. Kawayama, H. Murakami, and M. Tonouchi, Bandwidth tunable THz wave generation in large-area periodically poled lithium niobate, Opt. Express, vol.20, issue 8, pp , [36] K. Suizu, K. Koketsu, T. Shibuya, T. Tsutsui, T. Akiba, and K. Kawase, Extremely frequencywidened terahertz wave generation using Cherenkovtype radiation, Opt. Express, vol.17, pp , April [37] K. Suizu, T. Shibuya, H. Uchida, and K. Kawase, Prism-coupled Cherenkov phase-matched Terahertz wave generation using a DAST crystal, Opt. Express, vol.18, pp , Feb [38] S. Fan, H. Takeuchi, T. Ouchi, K. Takeya, and K. Kawase, Broadband terahertz wave generation from a MgO:LiNbO 3 ridge waveguide pumped by a 1.5 µm femtosecond fiber laser, Opt. Lett., vol.38, no.10, pp ,

9 2014/11 Vol. J97 C No () COE

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