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Calculated DFG output in PPLN around as a function of signal wavelength at various temperatures. The pump wavelength is fixed and the signal is assumed to be tunable. A MIR idler bandwidth of greater than 500 nm is easily obtained.
Experimental setup for DFG in the MIR region in PPLN. LD: laser diode, ECL: external cavity diode laser, EDFA: erbium-doped fiber amplifier, OL: objective lens, PC: phase compensator, : mirror, DM: dichroic mirror, : lens, Ge: Ge filter, PbSe: PbSe detector, LIA: lock-in amplifier, PM: power meter, : quarter wave plate, : half wave plate.
Measured DFG power around as a function of signal wavelength. The PPLN temperature was set from 50 to 64 °C. These temperatures are distinguished by the thickness and width of the curves. The signal wavelength was scanned from 1540 to 1600 nm. These provided idler wavelengths of 2414–2280 nm. The measured area was limited to part of the calculated area as shown in Fig. 1.
Comparison of calculated DFG output power and measured idler power as a function of PPLN temperature. The pump wavelength was fixed at 940 nm and the signal wavelength was also set at a constant 1570 nm. The QPM periods were , 27.2, 27.3, and . The measured values are shown as closed circles, triangles, squares, and open circles, respectively. The calculated curves are shown in gray.
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