（1）用a repetition rate of 1 kHz. a wavelength of 800 nm. 40, NA = 0.65 microscope objective在LiNbO3中能诱导负的折射率改变FIGURE 1 Refractive index profiles of two typical waveguides measuredwith a shearing interference microscope at a wavelength of 550 nm. (a) neand (b) no of a waveguide in z-cut LiNbO3 written with 1 J, 420 fs pulses.(c) ne and (d) no of a waveguide in an x-cut crystal written with 0.2 J,380 fs pulses. (e) Waveguide mode field at a wavelength of 633 nm correspondingto t
