Figure 1: Experimental Setup. Encoding the input beam:

The 803-nm input mode (dark red) is prepared by modulating the spatial phase of photons from a fiber-coupled laser diode (LD) via a spatial light modulator (SLM). Frequency conversion: A nonlinear crystal (Mg:ppLN) is pumped with a Gaussian beam emitted by from a fiber-coupled 1540-nm LD (light red). The pump power is controlled using a fiber polarization controller (PC) and a polarizing beam splitter. The polarization states of the pump and input modes are set using half-wave plates (HWP). The 1540-nm and the 803-nm light are combined via a dichroic mirror (DM1) and focused to the center of the nonlinear crystal via an achromatic lens. A second dichroic mirror (DM2) blocks the pump light, and transmits the 803-nm beam and the 527-nm sum-frequency mode (green). SFG analysis: The 803-nm light is blocked by an interference filter (IF) and the intensity profile of the sum-frequency field is analyzed using a CCD. The phase-structure of the SFG mode is analyzed using a phase mask and a single-mode fiber (SMF). The power coupled into the single-mode fiber is monitored using a power meter (PM).