title: A webcam in Bayer-mode as a light beam profiler for the near infra-red.
abstract: Beam profiles are commonly measured with complementary metal oxide semiconductors (CMOS) or charge coupled devices (CCD). The devices are fast and reliable but expensive. By making use of the fact that the Bayer-filter in commercial webcams is transparent in the near infra-red (>800 nm) and their CCD chips are sensitive up to about 1100 nm, we demonstrate a cheap and simple way to measure laser beam profiles with a resolution down to around ±1 μm, which is close to the resolution of the knife-edge technique.
authors: Christian Doppler Laboratory for Photoacoustic Imaging and Laser Ultrasonics, Science Park 2/2. OG, Altenberger Straße 69, 4040 Linz, Austria.
authors: Gregor
authors: G
authors: Langer
authors: Armin
authors: A
authors: Hochreiner
authors: Peter
authors: P
authors: Burgholzer
authors: Thomas
authors: T
authors: Berer
keywords: Bayer-mode; Beam profiler; Webcam
references: Appl Spectrosc. 2004 Nov;58(11):1372-5
references: 18070412
references: Opt Lett. 1982 May 1;7(5):196-8
references: 19710869
references: Appl Opt. 1975 Dec 1;14(12):2809-10
references: 20155108
references: Rev Sci Instrum. 2009 May;80(5):054901
references: 19485524
references: Lasers Surg Med. 2008 Feb;40(2):139-45
references: 18306154