Write a literature review in the effects of selecting laser meam spot profile (e.g crircle.ellipce,line heat source)in microstructure and morphology of coating layer (such porosity ,crack,homegenioty).

structure:1-list the different laser beam profile .
2.speak about the required needed in laser spot (such uniform intensity,and avoid high thermal gradient around the laser spot which could lead to cracks )(maybe put pitures).
3-Deep critical literature with high quality of influence in differents beam profile in co2 laser in the coating quality.(focus in WC-12CO ,INCONAL 625 coating powder.
compare the advantages and disadvantges of each laser beam profile.

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