To lase, or lasing, is correct terminology, despite what you haven't heard.

https://www.thefreedictionary.com/lasing

https://www.clf.stfc.ac.uk/Pages/ar0...ing_effect.pdf

https://physics.aps.org/articles/v7/129

https://www.dictionary.com/browse/lasing

https://www.merriam-webster.com/dictionary/lase

https://www.lexico.com/en/definition/lase

https://www.yourdictionary.com/lase

https://www.collinsdictionary.com/di...y/english/lase

https://www.wordnik.com/words/lase

To lase, or lasing, is not a made up, nor incorrect terminology.