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Gigahertz modulation of tunable terahertz radiation from photomixers driven at telecom wavelengths
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View: Figures


Image of FIG. 1.
FIG. 1.

Normalized FTIR spectra of terahertz waves emitted by the based photomixer illuminated by two cw telecom lasers. The gap observed between 0.9 and 1.2 THz is due to the low transparency in this spectral region of the -thick Mylar beamsplitter used in the FTIR spectrometer (transmission in inset). The FTIR was operated in rapid scan mode.

Image of FIG. 2.
FIG. 2.

Normalized FTIR spectra of the photomixer output when the device is illuminated by the two telecom lasers modulated in amplitude. Several frequency offsets corresponding to , 0.64, 0.8, and 1.25 THz are presented. Both the emissions with the high-frequency modulation on (plain curves) and off (dotted lines) are shown.

Image of FIG. 3.
FIG. 3.

FTIR spectra at several extinction ratios for frequency offsets between the two modulated telecom lasers of 0.66 THz. Insert: Sideband power , normalized to the carrier power , plotted as a function of the extinction ratio . The filled and open diamonds represent the peak amplitudes at frequency and , respectively. The dashed line indicates the theoretical law.

Image of FIG. 4.
FIG. 4.

Microwave sidebands at several modulation frequencies from 8.1 to 20 GHz. The electro-optic bandwidth of the Mach–Zehnder modulator is 20 GHz. Spectra are shown as frequency shift relative to the 0.66 THz carrier and the amplitude are normalized by the factor .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Gigahertz modulation of tunable terahertz radiation from photomixers driven at telecom wavelengths