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As regards laser interaction , it is modelled by a Beer-Lambert type heat source , in which lateral scattering and material absorption are considered through two characteristic parameters .
 As, laser, heat source, material, absorption, parameters
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:
 As, laser, heat source, material, absorption, parameters