  We present the development of a time- and angle-resolved photoemission
spectroscopy based on a Yb-based femtosecond laser and a hemispherical electron
analyzer. The energy of the pump photon is tunable between 1.4 and 1.9 eV, and
the pulse duration is around 30 fs. We use a KBe$_2$BO$_3$F$_2$ non-linear
optical crystal to generate probe pulses, of which the photon energy is up to
6.7 eV, and obtain an overall time resolution of 1 ps and energy resolution of
18 meV. In addition, $\beta$-BaB$_2$O$_4$ crystals are used to generate
alternative probe pulses at 6.05 eV, giving an overall time resolution of 130
fs and energy resolution of 19 meV. We illustrate the performance of the system
with representative data on several samples (Bi$_2$Se$_3$, YbCd$_2$Sb$_2$,
FeSe).
