  The residual cavity-pulling effect limits further narrowing of linewidth in
dual-wavelength (DW) good-bad-cavity active optical clocks (AOCs). In this
paper, we for the first time experimentally realize the cavity-length
stabilization of the 1064/1470 nm DW-AOCs by utilizing the phase locking
technique of two independent 1064 nm good-cavity lasers. The frequency tracking
accuracy between the two main-cavities of DW-AOCs is better than $3 \times
{10^{ - 16}}$ at 1 s, and can reach $1 \times {10^{ - 17}}$ at 1000 s. Each
1470 nm bad-cavity laser achieves a most probable linewidth of 53 Hz, which is
about a quarter of that without phase locking. The influence of the
asynchronous cavity-lengths variation between two DW laser systems is
suppressed.
