Acousto-optic crystal optical waveguide and acoustic wave sensor having the same

An acoustic wave sensor with acousto-optic crystal optical waveguide includes:

• a light source used for offering a light beam;
• at least one acousto-optic crystal optical waveguide including an acousto-optic crystal core and an inner cladding layer covers the acousto-optic crystal core, wherein the acousto-optic crystal core comprises an input terminal and an output terminal, the light beam inputs into the input terminal and outputs from the output terminal, the light beam transmits through the acousto-optic crystal core in waveguide propagation modes, the acousto-optic crystal density of the acousto-optic crystal core produces periodic change to make refraction index of the acousto-optic crystal core produce periodic change to form a grating that makes a light beam with specific wavelength unable to transmit through the acousto-optic crystal core in waveguide propagation modes and refract to outside of the acousto-optic crystal optical waveguide from the acousto-optic crystal core to change spectrum of the light beam transmitting through the acousto-optic crystal core when the acousto-optic crystal optical waveguide is affected by a continuous acoustic wave;
• and
• a photo detector receiving the light beam transmitted from the output terminal, wherein the photo detector is used for analyzing the light beam transmitting through the acousto-optic crystal optical waveguide.