Detection system, catheter device, and laser ablation device

A laser ablation device for outputting an ablation laser beam from a distal end of an optical fiber and irradiating a target area with the ablation laser for treatment, comprising:

• a laser beam source that outputs the ablation laser beam input to a proximal end portion side of the optical fiber;
• at least one light source that outputs a plurality of test beams input to the proximal end portion side of an optical fiber and having different wavelengths and providing different bending losses of the optical fiber;
• at least one reflector that reflects each of the test beams propagating through the optical fiber, on a distal end portion side of the optical fiber;
• a plurality of light receivers arranged to receive a plurality of reflected beams each being a beam reflected by the at least one reflector, on the proximal end portion side;
• a first optical multiplexer/demultiplexer configured to multiplex the plurality of test beams;
• a second optical multiplexer/demultiplexer configured to demultiplex the plurality of reflected beams;
• and
• a determination unit comprising a calculation unit and storage unit which are configured so that the determination unit, based on information about the reflected beams at the plurality of light receivers, compares the information about the reflected beams with reference set values,
• wherein the information about the reflected beams includes received light intensities of the reflected beams at the light receivers, and the reference set values are thresholds of the received light intensities, and
• the determination unit is configured so that it determines whether the optical fiber is bent or broken based on the received light intensities of the reflected beams.