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Some more information: I want making something like this: Laser precipitation monitor (Distrometer)

Thanks for answer, In fact, it's for a photosensor/phototransistor. I want to sense small particles and calculate the time the particle enters/exits the beam and measure the size of the particles. So it has to have relative fixed dimensions.

For some measurement techniques, I have to produce a sheeted (rectangular) laser beam in dimensions of the range of 20/30mmx1mm or 2mm. (max 0.5-3mW) I searched on the internet already for some weeks find such low-cost laser diodes of compact systems, but without luck. I hope someone can help...