Try the following:
#example figure1
ax1.plot(range(2),range(2),linewidth=2)
ax1.minorticks_on()
ax1.tick_params('both', length=20, width=2, which='major')
ax1.tick_params('both', length=10, width=1, which='minor')
You can repeat the same for ax2
. Does this work for you?