Fig. 1. Schematic of the experimental setup. The squeezed state in the HG00 mode of the OPA is first measured at PD1 with flip1. The BSS changes the spatial profile of the light, and the squeezing level is then measured at PD2. Flip2 is used to direct the generated modes for purity measurement. PD, photoelectric detector; HWP, half-wave plate; BS, beam splitter; MC, mode cleaner.

Fig. 2. Holograms loaded onto SLM1 and SLM2 for generating HG10 and HG50 modes.

Fig. 3. OPA squeezing. The measurement parameters of the spectrum analyzer are RBW, 300 kHz; VBW, 1 kHz; analysis frequency, 3 MHz.

Fig. 4. Squeezed spatial modes. The measurement parameters of the spectrum analyzer are RBW, 300 kHz; VBW, 1 kHz; analysis frequency, 3 MHz.

Fig. 5. Theoretical and experimental modes and interferograms.

Fig. 6. Purity of the generated modes and the inferred squeezing in the perfect modes.