Ka whakakotahihia e ēnei whakakotahi hihi, he mea hanga ki te BK7 (H‑K9L) te silica kua hanumi rānei, ngā hihi e rua e haere mai ana (UV, e kitea ana, e tata ana rānei ki te IR) hei putanga kotahi. Mā te tuku i ngā kaiwhakamahi ki te whakakikorua i te mārama e kitea ana ki te hihi laser e kore e kitea, ka tino māmā ake te tukanga whakahāngai.
E 20 tau te roangaru e arotahi ana ki te whakarato i ngā hua whatu tino tika.