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We describe an experimental setup for producing a large cold erbium (Er)sample in a narrow-line magneto-optical trap (MOT) in a simple and efficientway. We implement a pair of angled slowing beams with respect to the Zeemanslower axis, and further slow down atoms exiting from the Zeeman slower. Thesecond-stage slowing beams enable the narrow-line MOT to trap atoms exitingfrom the Zeeman slower with higher velocity. This scheme is particularly usefulwhen the Zeeman slower is at low optical power without the conventionaltransverse cooling between an oven and a Zeeman slower, in which case wesignificantly improve the loading efficiency into the MOT and are able to trapmore than $10^8$ atoms in the narrow-line MOT of $^{166}$Er. This workhighlights our implementation, which greatly simplifies laser cooling andtrapping of Er atoms and also should benefit other similar elements.

Efficient production of a narrow-line erbium magneto-optical trap with two-stage slowing