Fig. 1. Schematic of the optical system DL: diode laser; PBS: polarization beam splitter; ISO: isolator; FC: fiber coupler; FEOM: fiber-coupled electro-optic modulator; PD: photodetector; TA: tapered amplifier; AOM: acousto-optic modulator; F-P: Fabry-Perot cavity

Fig. 2. Schematic of microwave drive circuit for the optical system AO: analog output; DO: digital output; VCO: voltage controlled oscillator; FEOM: fiber electro-optic modulator;DDS: direct digital synthesizer; TTL: transistor-transistor logic; VCA: voltage controlled attenuator; AOM: acousto-optic modulator

Fig. 3. Phase noise of the microwave circuit for driving Raman laser

Fig. 4. Rubidium atomic saturation absorption spectra of the FEOM1 output laser. (a) Rubidium vapor cell temperature is 25 °C;(b) Rubidium vapor cell temperature is 35 °C

Fig. 5. Design drawing of the optical system (overall size of the optical system is 400 mm × 483 mm × 133 mm)

Fig. 6. Temperature of the environment and theoptical system over time

Fig. 7. Laser power stability of optical system before and after temperature control

Fig. 8. Rubidium atom interference fringes with interference time of 71 ms