There are several varieties of laser, such as CO2 lasers, Nd-YAG lasers, ruby lasers, and dye lasers, which have different wavelengths and characteristics for handling different sorts of problems.
雷射的種類有二氧化碳雷射、(雅鉻雷射、紅寶石雷射、亞歷山大雷射、染料雷射等，依其不同的波長、特性，處理不同的問題。