[1] PARTHENOPOULOS D A,RENTZEPIS P M. 3-Dimensional optical storage memory[J]. Science,1989,245:843-845. [2] CUMPSTON B H,ANANTHAVEL S P,BARLOW S,et al.. Two-photon polymerization initiators for three dimensional optical data storage and microfabrication[J]. Nature,1999,398:51-54. [3] ZHOU W,KUEBLER S M,BRAUN K L,et al. An efficient two-photon generated photoacid applied to positive tone 3D microfabrication[J]. Science,2002,296:1106-1109. [4] XING J F,DONG X Z,KAWATA S,et al.. Improving spatial resolution of two-photon microfabrication by using photoinitiator with high initiating efficiency[J]. Appl. Phys. Lett.,2007,90:131106. [5] DENK W,STRICKLER J H,WEBB W W. Two-photon laser scanning fluorescence microscopy[J]. Science,1990,248:73-76. [6] BELFIELD K D,BONDAR M V,HERNANDEZ F E,et al.. Two-photon absorption cross section determination for fluorene derivatives: analysis of the methodology and elucidation of the origin of the absorption processes[J]. J. Phys. Chem. B,2007,111:12723-12729. [7] PHAN T G,BULLEN A. Practical intravital two-photon microscopy for immunological research: faster, brighter, deeper[J]. Immunology and Cell Biology,2010,88:438-444. [8] KOHLER R H,CAO J,ZIPFEL W R,et al.. Exchange of protein molecules through connections between higher plant plastids[J]. Science,1997,276:2039-2042. [9] HE G S,YUAN L,CUI Y,et al.. Studies of two-photon pumped frequency-upconverted lasing properties of a new dye material[J]. J. Appl. Phys.,1997,81:2529-2537. [10] HE G S,ZHAO C F,BHAWALKAR J D,et al.. Two-photon pumped cavity lasing in novel dye doped bulk matrix rods[J]. Appl. Phys. Lett.,1995,67:3703-3705. [11] SPANGLER C W. Recent development in the design of organic materials for optical limiting[J]. J. Mater. Chem.,1999,9:2013-2020. [12] MOREL Y,IBANEZ A,ANDRAUD C,et al.. Nonlinear absorption spectra of transparent organic crystals for optical limiting applications at visible wavelengths[J]. Synthetic Metals,2000,115:265-268. [13] MIAH M I. Stimulated photoluminescence and optical limiting in CdI2[J]. Optical Materials,2002,20(4):279-282. [14] ISHII K,SHIINE M,HOSHINO S I,et al.. Control of photobleaching in photodynamic therapy using the photodecarbonylation reaction of ruthenium phthalocyanine complexes via stepwise two-photon excitation[J]. J. Phys. Chem. B,2008,112:3138-3143. [15] ZHUO SH M,CHEM J X,JIANG X SH,et al.. Extracting diagnostic stromal organization features based on intrinsic two-photon excited fluorescence and second-harmonic generation signals[J]. J. Biomed. Opt.,2009,14(2):020503. [16] TWAROWSKI A J,KLIGER D S. Multiphoton absorption spectra using thermal blooming[J]. Chem. Phys.,1977,20:259-264. [17] SHEIK-BAHAE M,SAID A A,WEI T,et al.. Sensitive measurement of optical nonlinearities using a single beam[J]. IEEE J. Quantum Electron.,1990,26:760-769. [18] HERMANN J P,DUCUING J. Absolute measurement of two-photon cross sections[J]. Phys. Rev. A,1972,5:2557-2568. [19] BOGGESS T F,BOHNERT K M,MANSOUR K,et al.. Simultaneous measurement of the two-photon coefficient and free-carrier cross section above the bandgap of crystalline silicon[J]. IEEE J. Quantum Electron.,1986,22:360-368.