Fig. 6: Experimental setup of c. w. DFG based on another ZGP micro-waveguide and characterizations of spectra of pump, signal, and corresponding LWIR idler waves. | Nature Communications

Fig. 6: Experimental setup of c. w. DFG based on another ZGP micro-waveguide and characterizations of spectra of pump, signal, and corresponding LWIR idler waves.

From: Highly efficient octave-spanning long-wavelength infrared generation with a 74% quantum efficiency in a χ(2) waveguide

Fig. 6

a The schematic of c. w. mid-infrared laser generation through DFG in ZGP waveguide. WDM wavelength division multiplexer, L lens, FC fiber collimator, LPF long-pass filter. The setup is composed of three parts, including a home-built c. w. tunable random Raman fiber laser (RRFL) at a wavelength around 1350 nm, which is used as DFG pump source, as depicted in Supplementary Note 4, a commercial erbium-doped fiber amplifier (EDFA) seeded by tunable signal-frequency DFB laser (Conquer, KG-TLS-13-P-FA) emitting in the spectral range of 1527–1567 nm as DFG signal source, and another ZGP waveguide, cut at θ = 65.4° and φ = 0°. The RRFL and EDFA sources are combined by a fiber wavelength division multiplexer (WDM) as an all-fiber laser driver for DFG in the ZGP waveguide. b Typical pump spectra tuning from 1340 to 1370 nm. c Typical signal spectra tuning from 1550 to 1565 nm. d The measured spectra of generated LWIR lasing tunable from 10.28 to 10.58 μm through DFG in the ZGP waveguide.

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