  In this article, we report on a magneto-optical trap (MOT) created by the
2nd-order external cavity diode lasers (ECDLs). The lasers were characterized.
We have observed the non-continuous changes of the wavelength as a function of
the laser diode current. This study is beneficial for achieving tunable
atom-atom interactions, quantum tunneling, precision measurement, ultracold
plasma, as well as quantum computing.
