Figure 2

Schematic of the laser system. Each primary oscillator passes light through a fibered optical isolator and into a combination of fused fiber splitter/combiners to create beatnotes. The three primary oscillators that are frequency stabilized via beatnotes seed four EDFAs, which in turn seed four PPLN crystals. The Raman outputs are controlled using fibered AOMs at 1560 nm, after the amplifiers but before the PPLN crystals. After the PPLN crystals, the light is sent to various micro-optic modules to split, combine, and output the light via PM optical fibers. AOMs contained within the 1 × 3 micro-optic bench, (e) in Fig. 3, provide control of the 3D MOT fibers. To create a frequency reference for the RF control of the laser system, we employ a PLDRO to generate a 3.5 GHz signal for mixing with the high frequency beatnote in the system - the beat between 3D MOT/Raman 2 and Repump/Raman 1; we exert control over the Repump/Raman 1 laser via mixing with a DDS. A part of the power of the PLDRO is mixed with a DDS control frequency and doubled to drive the EOM in the 2D MOT chain that addresses the repump transition. The other beat notes are controlled similarly but do not require a high frequency reference like the PLDRO - we divide down the various beatnotes and mix directly with DDS signals. The PLDRO and DDS are phase locked to a 100 MHz input signal. RF and microwave connections are in black, 1560 nm PM fibers are in blue, and 780 nm PM fibers are in red.