(a) The Fourier spectrum of wavelength dependent THz traces pumped from 1250 nm to 2050 nm. (b) Peak-to-peak electric-field strength versus pump wavelength, showing that PNPA performs best on the range 1250 nm to 1800 nm.

Contexts in source publication

Context 1

... dependent measurements also highlight another useful aspect of PNPA. While most organic generation crystals perform best in a select range of wavelengths, PNPA generates strongly in a broad range of pump wavelengths, as shown in Figure 4. Figure 4a shows the THz spectra recorded using the 529 μm thick crystal and varying the pump wavelength from 1250 nm to 2150 nm in 100 nm steps, with a constant pump pulse energy of ~0.26 mJ. ...

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... dependent measurements also highlight another useful aspect of PNPA. While most organic generation crystals perform best in a select range of wavelengths, PNPA generates strongly in a broad range of pump wavelengths, as shown in Figure 4. Figure 4a shows the THz spectra recorded using the 529 μm thick crystal and varying the pump wavelength from 1250 nm to 2150 nm in 100 nm steps, with a constant pump pulse energy of ~0.26 mJ. In each associated spectrum, shorter pump wavelengths from 1250 nm to 1550 nm exhibit a peak in spectral amplitude at ~1.5 THz, followed by an absorption dip just above 2 THz, and significant amplitude up to higher frequencies limited by the pump pulse duration. ...

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... wavelengths from 1650 nm to 2050 nm also produce high spectral amplitudes below 2 THz, but these longer pump wavelengths appear to be better phase matched for higher THz frequencies (2-5 THz). Figure 4b shows peak-to-peak electric-field versus pump wavelength. We see that from 1250 nm to 1800 nm there is a fairly consistent peak-to-peak THz field strength, with an approximately 10% increase leading to a maximum output at 1565 nm. ...