{"first_sentence": {"type": "/type/text", "value": "The M2 model, in the characterization of laser beams, is currently the preferred way of quantitatively describing a laser beam including its propagation through free space and lenses; specifically as ratios of its parameters with respect to the simplest theoretical gaussian laser beam."}, "physical_format": "Hardcover", "last_modified": {"type": "/type/datetime", "value": "2008-04-29 15:03:11.581851"}, "weight": "3.5 pounds", "languages": [{"key": "/l/eng"}], "publishers": ["CRC"], "number_of_pages": 1175, "isbn_13": ["9780824755690"], "id": 11010033, "edition_name": "2 edition", "isbn_10": ["0824755693"], "publish_date": "July 23, 2004", "key": "/b/OL8125805M", "authors": [{"key": "/a/OL2871045A"}], "title": "Handbook of Optical and Laser Scanning, Second Edition (Optical Engineering)", "type": {"key": "/type/edition"}, "subjects": ["Applied optics", "Optics", "Lasers in Medicine", "Technology & Industrial Arts", "Medical", "Scanning Systems", "Engineering - General", "Technology / Lasers", "Lasers", "Congresses", "Optical scanners"], "physical_dimensions": "10.1 x 7.3 x 1.9 inches", "revision": 1}