Trigger laser (or break a beam) without anything on the other side

is possible detect when laser beam broken without photocell (or similar device) on receiving end?

i'm not particularly married laser i'm interested in concept of "breaking beam". restriction circuit behind (in case arduino uno/mega) needs able tell beam broken in under millisecond, otherwise solution not useful in case.
i've tried infrared proximity sensors , works it's couple of ms slow (at least ones had lying around). tried pir sensor , lag time on on couple of seconds, it's not either. photocells seemed work best in application can't place them -or else- on receiving end; has one-sided operation only, speak.

any recommendations appreciated.

is supposed serious question ?
is possible call doesn't have phone?
how respond question ?
is there difference?
you have transmitter (laser) no receiver.
how suppose wiuld detect if beam was
broken if have no way define " not broken" ?
are going reply " oh, that's simple. it's not broken if beam
doesn't hit !" ?
how know that?

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