Spectra Physics

what is laser pulsing in mass spectrometry?

I have to do a presentation about ionisation in mass spectrometry at school and have found out generally about ionisation and electron impact
all i have left to do is write about laser pulsing but i cant find anything on the internet about it
please could anyone explain laser pulsing in as much detail as possible and possibly post some useful website??
thank you in advance
(this is the final piece i need to do!)

some lasers pulse as opposed to continuous mode

Go to "Spectra Physics" (a company) website

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