Apparatus for applying laser radiation (for medical purposes); Laser beam delivery apparatus for medical use; Laser beam delivery instruments for medical use; Laser devices for medical application; Laser light transmitting apparatus for medical use; Laser light treatment apparatus for medical use; Lasers for medical purposes; Medical apparatus for producing laser radiation; Medical instruments incorporating lasers; Medical laser apparatus; Medical laser beam apparatus; Light production apparatus for medical use; Visible light treatment apparatus; Visible light treatment instruments