Fig. 2.

(a, b) Bright field images in identical structure area for skeletal muscle tissues without and with toluidine blue staining. (c, d) PT images on the area outlined by black rectangles on (a, b). (e, f) PT images at white square area on (c, d), where the lateral line noise arising from the instability of stage motion is reduced by the line filter of FFT. (g) Normalized intensity profiles on line A-B in (e) and (f). Pump laser powers are 1.0 mW and 0.1 mW for measurement of unstained and stained tissue, respectively. Probe laser powers are 1 mW for both tissues.