Gänger Benjamin, Phieler Jan, Nagler Benjamin, Widera Artur
Department of Physics and Research Center OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany.
Rev Sci Instrum. 2018 Sep;89(9):093105. doi: 10.1063/1.5045827.
We report on the design and construction of a versatile setup for experiments with ultracold lithium (Li) gases. We discuss our methods to prepare an atomic beam and laser cool it in a Zeeman slower and a subsequent magneto-optical trap, which rely on established methods. We focus on our laser system based on a stable interference-filter-stabilized, linear-extended-cavity diode laser, so far unreported for lithium wavelengths. Moreover, we describe our optical setup to combine various laser frequencies for cooling, manipulation, and detection of Li atoms. We characterize the performance of our system preparing degenerate samples of Li atoms via forced evaporation in a hybrid crossed-beam optical-dipole trap plus confining magnetic trap. Our apparatus allows one to produce quantum gases of ≈ 10…10 fermionic lithium-6 atoms at nanokelvin temperatures in cycle times below 10 s. Our optical system is particularly suited to study the dynamics of fermionic superfluids in engineered optical potentials.
我们报告了一种用于超冷锂（Li）气体实验的通用装置的设计与构建。我们讨论了制备原子束并在塞曼减速器及随后的磁光阱中对其进行激光冷却的方法，这些方法基于已有的方法。我们重点介绍了基于稳定的干涉滤光片稳定的线性扩展腔二极管激光器的激光系统，该系统用于锂波长的情况迄今尚未见报道。此外，我们描述了用于组合各种激光频率以冷却、操控和检测锂原子的光学装置。我们通过在混合交叉束光偶极阱加限制磁阱中进行强迫蒸发来制备锂原子简并样品，以此表征我们系统的性能。我们的装置能够在低于10秒的循环时间内，在纳开尔文温度下产生约10⁴…10⁵个费米子锂 - 6原子的量子气体。我们的光学系统特别适合于研究工程光学势中费米子超流体的动力学。
