We have developed spectrally encoded photoacoustic microscopy using a digital mirror device for multiwavelength tomography, which enables fast spectral imaging of optical absorption. The optical illumination wavelengths are multiplexed at a laser pulse repetition rate of ∼2 kHz. Liquid samples, whole blood, and blood vessels in mouse ears were imaged. Compared with internal wavelength tuning of a narrow-band laser, external wavelength tuning based on a digital mirror device improves the data

more »

... uisition speed of spectral photoacoustic microscopy. Compared with external wavelength scanning of a wide-band laser with the same pulse energy, spectral encoding improves the signal-to-noise ratio. Wang, Maslov, and Wang: Spectrally encoded photoacoustic microscopy using a digital mirror device Downloaded From: http://biomedicaloptics.spiedigitallibrary.org/ on 06/29/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Fig. 2 Absorption spectra of (a) DQOCI dye and (b) bovine blood measured by a spectrophotometer and the photoacoustic imaging system in highenergy wavelength scanning, low-energy wavelength scanning, and spectrally encoded modes.