Abstract: A laser therapy device comprising a pulsed laser light source. Each triggering of tissue irradiation causes application of a first heating laser pulse of a first power and a first pulse duration and at least a second heating laser pulse of a second power and a second pulse duration to the tissue. Changes in volume resulting from the rising and the decreasing power gradient of the first laser pulse are detected. The therapy device, on the basis of the measured values relative to the change in volume and taking into consideration at least the predetermined rises of the power gradients of the first heating laser pulse, determines an estimated value for the temperature increase in the tissue during irradiation of the first heating laser pulse, and generates, from the estimated value, a command that causes adjustment of the second power and/or the second pulse duration of the second laser pulse.