  We present light curves and classification spectra of 17 hydrogen-poor
superluminous supernovae (SLSNe) from the Pan-STARRS1 Medium Deep Survey (PS1
MDS). Our sample contains all objects from the PS1 MDS sample with
spectroscopic classification that are similar to either of the prototypes
SN2005ap or SN2007bi, without an explicit limit on luminosity. With a redshift
range $0.3 < z < 1.6$, PS1MDS is the first SLSN sample primarily probing the
high-redshift population; our multi-filter PS1 light curves probe the
rest-frame UV emission, and hence the peak of the spectral energy distribution.
We measure the temperature evolution and construct bolometric light curves, and
find peak luminosities of $(0.5-5) \times 10^{44}$ erg s$^{-1}$ and lower
limits on the total radiated energies of $(0.3-2) \times 10^{51}$ erg. The
light curve shapes are diverse, with both rise- and decline times spanning a
factor of $\sim 5$, and several examples of double-peaked light curves. When
correcting for the flux-limited nature of our survey, we find a median peak
luminosity at 4000 {\AA} of $M_{\rm 4000} = -21.1$ mag, and a spread of $\sigma
= 0.7$ mag.
