Fig. 1. Vectorial diagram of noncollinear acoustic-optic interaction

Fig. 2. Experimental setup of the AOTF-based microscopic spectral imaging system

Fig. 3. Diffraction spectra of AOTF at the different acoustic frequencies. (a) 127 MHz; (b) 134 MHz; (c) 148 MHz; (d) 155 MHz; (e) 162 MHz; (f) 169 MHz

Fig. 4. Performance of AOTF-based microscopic spectral imaging system. (a) Relationship between spectral bandwidth of diffracted beam and central optical wavelength; (b) frequency tuning relation of noncollinear AOTF

Fig. 5. Hyperspectral images of lung cancer tissue with different center wavelengths of diffraction beams. (a) Without filtering; (b) 629.20 nm; (c) 576.21 nm; (d) 567.91 nm; (e) 542.12 nm; (f) 529.45 nm; (g) 503.84 nm; (h) 482.85 nm

Fig. 6. Relationship between the hyperspectral image intensity of the lung cancer tissue and the diffraction light center wavelength

Fig. 7. Intensity difference curves of target area and adjacent tissue