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Refractive index and absorption coefficient of COANP at terahertz frequencies. Dots: measured data. Solid lines: best fit to the measured data using a Lorentz two-oscillator model (Ref. 10) [see Eqs. (1)–(3) and Table I]. In the upper panel, the optical group indices (dotted line), (dashed line), and (dash-dotted line) are plotted for comparison as a function of wavelength (upper x scale) (Ref. 11).
The coherence lengths are shown for terahertz generation through optical rectification in COANP exploiting (upper panel) and (lower panel) as a function of terahertz frequency and laser wavelength.
The coherence length is shown for terahertz generation through optical rectification in COANP exploiting using a laser wavelength of 776 nm (solid line). For comparison, the coherence length of ZnTe at the same laser wavelength is plotted as a dotted line.
Terahertz pulse emitted from a 1.72 mm thick COANP crystal exploiting and detected in ZnTe using a laser wavelength of 776 nm (solid line). Terahertz pulse emitted from a 2.0 mm thick ZnTe crystal under identical conditions for comparison (dotted line). Top: Signals in time-domain. Bottom: Fourier spectra of the same signals. The curves are normalized to the maximum amplitude of the ZnTe signal in both time- and frequency-domain. Dashed line: Terahertz spectrum of ZnTe calculated from the terahertz spectrum generated in COANP (see text for details).
Parameters for the refractive index and the absorption coefficient of COANP in the Lorentz model [see Eqs. (1)–(3)]. An additional parameter used in the model calculation is the high frequency refractive index .
FoM for the generation of pulses with a central frequency of 1 THz and other relevant parameters of COANP in comparison with commonly used inorganic terahertz emitters.
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