Optical properties of DAST in the THz range.

We report the far-infrared properties of the organic crystal DAST, a popular terahertz emitter, from 0.6-12 THz through use of a THz spectrometer incorporating air-plasma THz generation and electro-optic (EO) sampling in a poled EO polymer. We identify absorption features at 1.1, 3.1, 5.2, 7.1, 8.4, 11, and 12.3 THz and at 1.1, 1.3, 1.6, 2.2, 3, 5.2, 7.2, 9.6 and 11.7 THz for a-axis and b-axis polarized THz radiation respectively. These results allow for more accurate prediction of the optimum crystal thickness for broadband THz emission via optical rectification and difference frequency generation.

[1]  Jingle Liu,et al.  Birefringence and absorption coefficients of alpha barium borate in terahertz range , 2009 .

[2]  S. Okada,et al.  Terahertz Properties of a New Organic Crystal, 4'-Dimethylamino-N-methyl-4-stilbazolium p-Chlorobenzenesulfonate , 2005 .

[3]  Shuji Okada,et al.  Widely tunable terahertz-wave generation in an organic crystal and its spectroscopic application , 2004 .

[4]  Xu Xie,et al.  Coherent control of THz wave generation in ambient air. , 2006, Physical review letters.

[5]  B. Fischer,et al.  Dynamic range in terahertz time-domain transmission and reflection spectroscopy. , 2005, Optics letters.

[6]  H. Takahashi,et al.  Far-infrared properties of DAST. , 2000, Optics letters.

[7]  Markus Kress,et al.  Terahertz-pulse generation by photoionization of air with laser pulses composed of both fundamental and second-harmonic waves. , 2004, Optics letters.

[8]  Jingdong Luo,et al.  Wideband 15THz response using organic electro-optic polymer emitter-sensor pairs at telecommunication wavelengths , 2008 .

[9]  Peter Günter,et al.  Generation of terahertz pulses through optical rectification in organic DAST crystals: theory and experiment , 2006 .

[10]  Peter Günter,et al.  Infrared and Raman spectroscopy of the organic crystal DAST: Polarization dependence and contribution of molecular vibrations to the linear electro-optic effect , 2002 .

[11]  C. R. Nair,et al.  Electron–phonon coupling and vibrational modes contributing to linear electro‐optic effect of the efficient NLO chromophore 4‐(N,N‐dimethylamino)‐N‐methyl‐4′‐toluene sulfonate (DAST) from their vibrational spectra , 2009 .

[12]  Ultra-Broadband, Frequency-agile THz-wave Generator and its Applications , 2008 .

[13]  George Rodriguez,et al.  Terahertz emission from ultrafast ionizing air in symmetry-broken laser fields. , 2007, Optics express.

[14]  Hiromasa Ito,et al.  New method to determine the refractive index and the absorption coefficient of organic nonlinear crystals in the ultra-wideband THz region. , 2010, Optics express.

[15]  J. Coutaz,et al.  A reliable method for extraction of material parameters in terahertz time-domain spectroscopy , 1996 .

[16]  Timothy M. Korter,et al.  Theoretical analysis of the solid-state terahertz spectrum of the high explosive RDX , 2008 .

[17]  Peter Günter,et al.  Electro‐optic properties of the organic salt 4‐N,N‐dimethylamino‐4′‐N′‐methyl‐stilbazolium tosylate , 1996 .

[18]  Xuemei Zheng,et al.  Organic Broadband Terahertz Sources and Sensors , 2007 .

[19]  S. Okada,et al.  Modification of DAST-based compounds toward enhanced terahertz-wave generation , 2009 .

[20]  K. Kawase,et al.  Prism-coupled Cherenkov phase-matched terahertz wave generation using a DAST crystal. , 2010, Optics express.

[21]  Masatsugu Yamashita,et al.  Generation and detection of broadband coherent terahertz radiation using 17-fs ultrashort pulse fiber laser. , 2008, Optics express.

[22]  Xiang Zhang,et al.  Terahertz optical rectification from a nonlinear organic crystal , 1992 .

[23]  Masashi Yoshimura,et al.  Development of DAST-derivative crystals for terahertz waves generation , 2009 .

[24]  P. Crozat,et al.  Optical phase detection in a 4-N,N-dimethylamino-4′-N′-methyl-stilbazolium tosylate crystal for terahertz time domain spectroscopy system at 1.55 μm wavelength , 2010 .