GaAs-based distributed feedback laser at 780 nm for ⁸⁷Rb cold atom quantum technology

High-Q Si3N4 Ring Resonators for Locking 780nm GaAs-Based Distributed Feedback Laser

“…High-Q microring resonators have applications in gyroscopes, frequency comb generation, and feedback systems to control narrow linewidth integrated lasers [1][2][3]. This paper demonstrates the highest Q values measured for microring resonators at 780 nm wavelength.…”

Narrow Linewidth Distributed Feedback Diode Lasers for Cooling in Cold Atom Systems

“…The DFB lasers were fabricated on a two-quantum-well GaAs/AlGaAs wafer material using an epilayer structure which was optimized for high-power applications and included a far-field reduction layer to improve the optical coupling into optical fibres [2]. The DFB gratings were patterned using a hydrogen silsesquioxane (HSQ) mask by electron beam lithography (EBL) and etched using chlorine dry etching (Fig.…”

“…Where cold atoms are used, for example to provide higher accuracy for atomic clocks, the systems make use of large, expensive lasers which are power-hungry and frequency doubled lasers are required to achieve certain wavelengths. The lasers for cooling are required to have very narrow linewidths (< 1 MHz) to target specific atomic transitions, such as the 87 Rb absorption line at 780.24 nm [2]. Distributed feedback (DFB) diode lasers are ideal for miniature systems as the lasers can be a few mm long [2] with narrow linewidths [3] and can be integrated with Si 3 N 4 photonics for chip scale systems [4].…”

“…The lasers for cooling are required to have very narrow linewidths (< 1 MHz) to target specific atomic transitions, such as the 87 Rb absorption line at 780.24 nm [2]. Distributed feedback (DFB) diode lasers are ideal for miniature systems as the lasers can be a few mm long [2] with narrow linewidths [3] and can be integrated with Si 3 N 4 photonics for chip scale systems [4]. In this work, 4 mm long distributed feedback (DFB) lasers have been fabricated emitting at 780.24 nm with power levels > 60 mW, linewidths of 612 kHz with a high side-mode suppression ratio of > 40 dBm (SMSR).…”

Distributed Feedback Lasers for Quantum Cooling Applications

“…Currently, many systems make use of large, expensive, power-hungry laser systems [2]; however semiconductor lasers offer a less expensive, chip-scale alternative. Semiconductor lasers can be easily integrated with other components and offer a much lower power consumption [3] which is desirable for the realisation of compact atomic clocks [4]. Single frequency lasers or distributed feedback (DFB) lasers are presented here which offer a solution.…”