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The diffractive scattering of photon off proton $\gamma^{(*)} p \to \gamma Y$(where $Y$ denotes the proton dissociative system or the elastically scatteredproton) is measured in two different kinematic regimes at high energy with theH1 detector at HERA. i) the process is studied for the first time at largetransverse photon momentum $p_t^{\gamma} > 2$ GeV in photoproduction regime($Q^2 < 0.01$ GeV$^2$)and photon-proton c.m.s. energy $175 < W < 247 {\rmGeV}$. The cross section is measured differentially in $t$ and in $\xpom$. Themeasurement is compared to a LL BFKL prediction of QCD. ii) inelectroproduction, the Deeply Virtual Compton Scattering (DVCS) $\gamma^* p \to\gamma p$ cross section has been measured more precisely and in an extendedkinematic domain: at photon virtualities $4<Q^2<80$ GeV$^2$ and $30<W<140$ GeV.The measurement is compared to NLO QCD calculations using the DGLAPapproximation and to Colour Dipole model predictions.Comment: Contribution to the Proceedings of International Europhysics  Conference on High Energy Physics EPS, July 17th-23rd 2003, Aachen, German

Studies of DVCS and photoproduction of photons at high t with the H1 detector