Fig. 1. Scheme of the AA-DFG system based on a monolithic multichannel tandem LN superlattice.

Fig. 2. Performances of the AA-DFG system pumped by Gaussian- or square-shaped pulses with 20 kW peak power and 50 ns duration. (a), (b) Pump-to-idler conversion efficiencies under different primary signal power and DFG length proportion; the color bars show the pump-to-idler conversion efficiency in percentage. (c), (d) Pulse profiles of the pump, residual pump, idler, primary signal, and secondary signal under the circled optimal working points for both cases. (a), (c) Pumped by Gaussian pulses. (b), (d) Pumped by square pulses.

Fig. 3. Acceptance bandwidths of the pump and primary signal laser with respect to (a) OPA domain periodicity variation, and (b) crystal temperature tuning range. The color bars show the periodicity variation in micrometers and temperature tuning range in degrees Celsius.

Fig. 4. Pump-to-idler conversion efficiency with respect to input beam diameter and DFG length proportion for primary signal power of 0.4 W with different OPA domain periodicity variations. (a) 0, (b) 0.06, (c) 0.12, and (d) 0.24 μm. The color bars show the pump-to-idler conversion efficiency in percentage.

Fig. 5. Pump-to-idler conversion efficiency with respect to input beam diameter and DFG length proportion for primary signal power of 4 W with different OPA domain periodicity variations. (a) 0, (b) 0.06, (c) 0.12, and (d) 0.24 μm. The color bars show the pump-to-idler conversion efficiency in percentage.

Fig. 6. Comparisons between AA-DFG systems with input primary signal powers of 4 W and 0.4 W on the (a) optimal length proportion of DFG section, (b) input beam diameter, and (c) pump-to-idler conversion efficiency with respect to OPA domain periodicity variation.