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Conference on Lasers and Electro-Optics

Continuous laser source for cooling Rubidium atoms using second harmonic generation from a PPLN crystal

Alexandre Bresson, Xavier Orlik, Aurélien Manchon, Fabien Lienhart

Published May 16, 2004• 0 citations
OpenAlex

Abstract

We have realized a compact, 0.2 W continuous sub-MHz laser source at 780 nm from second harmonic generation inside a periodically poled LiNbO/sub 3/ crystal. The fiber system fulfill requirements for cooling and trapping Rubidium atoms.

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Quantum Electronics and Laser Science Conference•Jan 1, 2008•0 citations
We report on efficient generation of continuous-wave squeezed light and second harmonics with a periodically poled MgO:LiNbO(3) (PPMgLN) crystal which enables us to utilize the large nonlinear optical coefficient d(33). We achieved the squeezing level of -7.60+/-0.15 dB at 860 nm by utilizing a subthreshold optical parametric oscillator with a PPMgLN crystal. We also generated 400 mW of second harmonics at 430 nm from 570 mW of fundamental waves with 70% of conversion efficiency by using a PPMgLN crystal inside an external cavity.
One of the prominent platforms for quantum technologies, cold atoms require reliable laser systems. We present the design, implementation, and characterization of a simple, compact, and economical laser system at 780 nm, entirely based on fiber components. Two semiconductor lasers at 1560 nm are amplified in a single erbium-doped fiber amplifier and frequency-doubled in a periodically-poled lithium niobate crystal. We characterize the amplitude noise and the linewidth of the lasers, as well as the SHG efficiency. With an RMS relative amplitude noise of 3 × 10−4 at 1 s and linewidths below 1 MHz, our system is suitable for cooling and trapping of Rb atoms.
Improvements in the power level of sources near 1550 nm and in the efficiency of waveguide frequency doublers enabled us to lock a frequency-doubled source directly to the 5S(1/2) ? 5D(5/2) two-photon transitions near 778 nm. We obtained a sufficiently powerful second-harmonic signal, exceeding 2 mW, by doubling an external-cavity diode laser that was amplified by an erbium-doped fiber amplifier in a periodically poled LiNbO(3) channel waveguide. Our experimental scheme can be used for realizing compact, high-performance frequency standards near 1550 nm for fiber-optic communication and sensing applications.
A new laser system is developed to laser cool rubidium atoms based on frequency doubling of a 1560 nm fiber bench. The use of telecom components gives a reliable and compact system robust compare to environmental perturbations. The laser system is validated by realizing a rubidium magneto-optical trap and an optical molasses. The laser system should find applications for onboard cold atoms experiments like inertial captors or atomic clocks. It is concluded that this laser system can also address potassium atoms which have a laser cooling wavelength of 767 nm.