Device for producing holograms by the contact copying method, comprising a hologram master a hologram master , a coherent light source for generating coherent light , a transport device for supplying and removing holographic recording material so that it is arranged adjacent to the hologram master for an exposure process, and a reaction chamber which surrounds the hologram master and protects the holographic recording material from ambient light and foreign material during the exposure process, wherein the coherent light of the coherent light source is irradiated into the reaction chamber during the exposure process, so that the coherent light passes through the holographic recording material arranged adjacent to and in front of the hologram master and is at least partially reflected back at the hologram master , so that changes are brought about inside the holographic recording material due to interference between the coherent light passing through the holographic recording material and the light at least partially reflected back from the hologram master . to form a hologram, or so that the hologram master is transmitted so that a portion of the coherent light passes through the hologram master unchanged and a further portion of the coherent light passes through the hologram master unchanged of the coherent light is deflected at the holgram master , so that, due to interference between the one unchanged portion of the coherent light and the further deflected portion of the coherent light , changes are brought about inside the holographic recording material arranged adjacent to and behind the holgram master , which changes form the hologram forming the hologram, wherein a cooling device for removing heat from the reaction chamber is formed, characterized in that at least one element of the cooling device is connected in a thermally conductive manner to the hologram master in order to cool the hologram master . comprising a hologram master a hologram master , a coherent light source for generating coherent light , a transport device for supplying and removing holographic recording material so that it is arranged adjacent to the hologram master for an exposure process, and a reaction chamber which surrounds the hologram master and protects the holographic recording material from ambient light and foreign material during the exposure process, wherein the coherent light of the coherent light source is irradiated into the reaction chamber during the exposure process, so that the coherent light passes through the holographic recording material arranged adjacent to and in front of the hologram master and is at least partially reflected back at the hologram master , so that changes are brought about inside the holographic recording material due to interference between the coherent light passing through the holographic recording material and the light at least partially reflected back from the hologram master . to form a hologram, or so that the hologram master is transmitted so that a portion of the coherent light passes through the hologram master unchanged and a further portion of the coherent light passes through the hologram master unchanged of the coherent light is deflected at the holgram master , so that, due to interference between the one unchanged portion of the coherent light and the further deflected portion of the coherent light , changes are brought about inside the holographic recording material arranged adjacent to and behind the holgram master , which changes form the hologram forming the hologram, wherein a cooling device for removing heat from the reaction chamber is formed, characterized in that at least one element of the cooling device is connected in a thermally conductive manner to the hologram master in order to cool the hologram master . <EOS>