A High-stability Compact Optical System for Integrating Sphere Cold Atom Clock

SummaryA high-stability compact optical system is proposed for integrating sphere cold atom clock. Both an extended cavity diode laser with linewidth of about 50 kHz and a distribution feedback Bragg laser are applied as laser sources. The frequency of the former is locked with high frequency stability of the 10 ⁻¹³ level between 1~10 ⁴ s averaging time. A new scheme of laser frequency stabilization and shift is realized and the laser power is stabilized to the 10 ⁻⁵ level between 1~10 ⁴ s averaging time. The reasonable arrangement of the optical paths enables a compact system with a total size of 500mm×500mm×200mm.