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Laser-matter interactions in laser additive manufacturing ( LAM ) occur on short time scales ( 10−6–10−3 s ) and have traditionally proven difficult to characterise .
 laser additive manufacturing, LAM, time scales, s
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 laser additive manufacturing, LAM, time scales, s