Adaptive optics for enhanced signal in CARS microscopy

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Wright, A.J. and Poland, S.P. and Girkin, J.M. and Freudiger, C.W. and Evans, C.L. and Xie, X.S. (2007) Adaptive optics for enhanced signal in CARS microscopy. Optics Express, 15 (26). pp. 18209-18219. ISSN 1094-4087 (http://dx.doi.org/10.1364/OE.15.018209)

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Abstract

We report the use of adaptive optics with coherent anti-Stokes Raman scattering (CARS) microscopy for label-free deep tissue imaging based on molecular vibrational spectroscopy. The setup employs a deformable membrane mirror and a random search optimization algorithm to improve signal intensity and image quality at large sample depths. We demonstrate the ability to correct for both system and sample-induced aberrations in test samples as well as in muscle tissue in order to enhance the CARS signal. The combined system and sample-induced aberration correction increased the signal by an average factor of ~3x for the test samples at a depth of 700 μm and ~6x for muscle tissue at a depth of 260μm. The enhanced signal and higher penetration depth offered by adaptive optics will augment CARS microscopy as an in vivo and in situ biomedical imaging modality.

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