Wide-Bandgap Material Ultra Low Loss UV to NIR Photonics

Photonic integrated circuits with ultra-low losses (< 0.1 dB/cm) in the visible region are critical for miniaturizing atom based quantum communication, information processing systems, and optical atomic clocks. Today, these systems employ free-space beam delivery with complex optical systems that occupy racks and tabletops. Photonic integration is the next key step to reduction in size and complexity paving the way for compact low power, low cost systems. Recent efforts to integrate laser beam delivery at visible wavelengths include low loss Al2O3 and Si3N4 waveguides. Si3N4 is transparent from 405nm-2350nm and has been used for devices at telecom wavelength (1550nm). We have demonstrated laser cooling beam delivery interface for 780nm rubidium atom clock applications. We have also demonstrated lowest propagation losses of <0.1 dB/cm in visible region (>450 nm) and highest Loaded Q resonators with ~ 9 million loaded Q at 674 nm and are working towards resonator based SBS laser and stabilization cavity.