A miniature frequency-stabilized VCSEL system emitting at 795 nm based on LTCC modules

We present a compact frequency-stabilized laser system locked to the Rubidium absorption line of a micro-fabricated reference cell. A Printed Circuit Board (PCB) is used to carry all the components and part of the electronics, and Low-Temperature Co-fired Ceramic (LTCC) modules are used to temperaturestabilize the laser diode and the miniature Rubidium cell (cell inner dimensions: 5 mm diameter and 2 mm height). The measured frequency stability of the laser, in terms of Allan deviation, is ≤ 8×10 for integration times of 10 – 10 seconds. The current overall dimensions of the system are 70 × 40 × 50 mm, with good potential for realization of a frequency-stabilized laser module with few cm volume.