Someone posted here on the photoacoustic effect a few days ago (https://news.ycombinator.com/item?id=21454851 https://news.ycombinator.com/item?id=21454851) and

Someone posted here on the photoacoustic effect a few days ago (https://news.ycombinator.com/item?id=21454851 https://news.ycombinator.com/item?id=21454851) and the link above is a cool old paper I discovered down that Internet rabbit hole...