<prompt> Laser used in LASIK-ExcimerArgonHolmiumNd-yag  <response>: Excimer excited dimer lasers are used in photo refractive keratotomy PRK, LASIK and phototherapeutic keratectomy. Mechanism : produce UV light of very sho wavelength which breaks chemical bonds of biologic materials, conveing them into small molecules that diffuse away. Ref: AK Khurana 6thE pg462 