A surgical laser system comprising: an array of laser diodes configured to output laser energy; a fiber bundle comprising a plurality of optical fibers and including a proximal end configured to receive laser energy from the array of laser diodes; a delivery fiber including a proximal end configured to receive laser energy from a distal end of the fiber bundle; and a tubular sheath defining a lumen in which at least a portion of the delivery fiber is disposed, wherein the tubular sheath is insertable into a working channel of an endoscope or cystoscope, and a distal end of the tubular sheath is configured to deliver laser energy discharged from the delivery fiber into a body of a patient, wherein the array of laser diodes includes first and second sub-arrays, the sub-arrays being separately operable, characterised in that the delivery fiber (114, 114C) includes a multiple cladding fiber comprising: a central light delivery medium; a first cladding surrounding the central light delivery medium and having a first index of refraction; an annular light delivery medium surrounding the first cladding; and a second cladding surrounding the annular light delivery medium and having a second index of refraction, wherein the laser energy output from the first sub-array of the laser diodes is optically coupled to the central light delivery medium, and the laser energy output from the second subarray of the laser diodes is optically coupled to the annular light delivery medium, or wherein the activation of the first and second subarrays of the laser diodes is configured to deliver laser energy through optical fibers of the fiber bundle that are oriented in a line, wherein the delivery fiber (114, 114A) has a rectangular core surrounded by a cladding to deliver a rectangular or line shaped output beam through the delivery fiber (114, 114A). an array of laser diodes configured to output laser energy; a fiber bundle comprising a plurality of optical fibers and including a proximal end configured to receive laser energy from the array of laser diodes; a delivery fiber including a proximal end configured to receive laser energy from a distal end of the fiber bundle; and a tubular sheath defining a lumen in which at least a portion of the delivery fiber is disposed, wherein the tubular sheath is insertable into a working channel of an endoscope or cystoscope, and a distal end of the tubular sheath is configured to deliver laser energy discharged from the delivery fiber into a body of a patient, wherein the array of laser diodes includes first and second sub-arrays, the sub-arrays being separately operable, characterised in that the delivery fiber (114, 114C) includes a multiple cladding fiber comprising: a central light delivery medium; a first cladding surrounding the central light delivery medium and having a first index of refraction; an annular light delivery medium surrounding the first cladding; and a second cladding surrounding the annular light delivery medium and having a second index of refraction, the delivery fiber (114, 114C) includes a multiple cladding fiber comprising: a central light delivery medium; a first cladding surrounding the central light delivery medium and having a first index of refraction; an annular light delivery medium surrounding the first cladding; and a second cladding surrounding the annular light delivery medium and having a second index of refraction, a central light delivery medium; a first cladding surrounding the central light delivery medium and having a first index of refraction; an annular light delivery medium surrounding the first cladding; and a second cladding surrounding the annular light delivery medium and having a second index of refraction, wherein the laser energy output from the first sub-array of the laser diodes is optically coupled to the central light delivery medium, and the laser energy output from the second subarray of the laser diodes is optically coupled to the annular light delivery medium, or wherein the activation of the first and second subarrays of the laser diodes is configured to deliver laser energy through optical fibers of the fiber bundle that are oriented in a line, wherein the delivery fiber (114, 114A) has a rectangular core surrounded by a cladding to deliver a rectangular or line shaped output beam through the delivery fiber (114, 114A).