A laser processing system, comprising: a laser device which is set up to direct a processing beam onto a processing region of a workpiece; and a device for distance measurement, the device comprising: a collimator lens system (120, 210), which defines an optical axis and is set up to collimate an optical measuring beam of a coherence interferometer or an optical coherence tomograph; a deflection lens system, which comprises at least one transmissive optical element (222, 224), which is displaceable relative to the optical axis in order to deflect the collimated optical measuring beam from the optical axis; and a focusing lens system (130, 230), which is set up to focus the deflected optical beam and the processing beam onto a workpiece; wherein said deflection lens system is arranged in the beam path in front of the focusing lens system (130, 230); wherein said deflection lens system comprises a first transmissive optical element and a second transmissive optical element, which are arranged one behind the other in the beam path and at least one of which is displaceable, wherein the first transmissive optical element is a plane-concave lens and the second transmissive optical element is a plane-convex lens, or wherein the first transmissive optical element is a plane-convex lens and the second transmissive optical element is a plane-concave lens, wherein the plane-concave lens has a first radius and the plane-convex lens has a second radius, wherein the absolute value of the first radius and the absolute value of the second radius are essentially identical. a laser device which is set up to direct a processing beam onto a processing region of a workpiece; and a device for distance measurement, the device comprising: a collimator lens system (120, 210), which defines an optical axis and is set up to collimate an optical measuring beam of a coherence interferometer or an optical coherence tomograph; a deflection lens system, which comprises at least one transmissive optical element (222, 224), which is displaceable relative to the optical axis in order to deflect the collimated optical measuring beam from the optical axis; and a focusing lens system (130, 230), which is set up to focus the deflected optical beam and the processing beam onto a workpiece; wherein said deflection lens system is arranged in the beam path in front of the focusing lens system (130, 230); wherein said deflection lens system comprises a first transmissive optical element and a second transmissive optical element, which are arranged one behind the other in the beam path and at least one of which is displaceable, wherein the first transmissive optical element is a plane-concave lens and the second transmissive optical element is a plane-convex lens, or wherein the first transmissive optical element is a plane-convex lens and the second transmissive optical element is a plane-concave lens, wherein the plane-concave lens has a first radius and the plane-convex lens has a second radius, wherein the absolute value of the first radius and the absolute value of the second radius are essentially identical. a collimator lens system (120, 210), which defines an optical axis and is set up to collimate an optical measuring beam of a coherence interferometer or an optical coherence tomograph; a deflection lens system, which comprises at least one transmissive optical element (222, 224), which is displaceable relative to the optical axis in order to deflect the collimated optical measuring beam from the optical axis; and a focusing lens system (130, 230), which is set up to focus the deflected optical beam and the processing beam onto a workpiece; wherein said deflection lens system is arranged in the beam path in front of the focusing lens system (130, 230); wherein said deflection lens system comprises a first transmissive optical element and a second transmissive optical element, which are arranged one behind the other in the beam path and at least one of which is displaceable, wherein the first transmissive optical element is a plane-concave lens and the second transmissive optical element is a plane-convex lens, or wherein the first transmissive optical element is a plane-convex lens and the second transmissive optical element is a plane-concave lens, wherein the plane-concave lens has a first radius and the plane-convex lens has a second radius, wherein the absolute value of the first radius and the absolute value of the second radius are essentially identical.