A 780nm Fully-Fibered Laser System, for Quantum Sensors in Hollow-Core Photonic Crystal Fibers

In this proceeding we present the design and characterization of a relatively simple, compact, and cost-effective laser system for quantum technologies. It operates at 780 nm to work with Rubidium (Rb) atoms, and apart from the frequency locking setup it is entirely based on fiber components. This improves reliability and makes it less complex and more versatile with respect to a free-space system. We also describe our experimental setup, aimed at demonstrating the possibility of confining atoms in hollow-core photonic-crystal fibers (HCPCF), while still being able to keep atoms cold and performing quantum sensing measurements. We finally present our characterization of the system. The measured features (rms relative amplitude noise of 3·10-4 at 1 s; linewidths well below 1 MHz; pressure in the vacuum chamber lower <10-9 mbar) indeed make our system a suitable candidate for applications in quantum sensors and atom interferometers, which are briefly discussed.