1. An image generation system, the system generating an ultrasound image and a photo-acoustic image of an object, the system comprising: a laser source outputting a first laser pulse having a first wavelength or a second laser pulse having a second wavelength; an optical filter receiving and filtering the first laser pulse and the second laser pulse, the optical filter almost completely absorbing the energy of the first laser pulse, generating and transmitting a photoacoustics-based ultrasound to the object, the object scattering and reflecting the photoacoustics-based ultrasound so an echo is generated; the optical filter almost completely transmitting the second laser pulse so the second laser pulse is transmitted to the object, the object generating and sending a photo-acoustic wave; and an optical-based ultrasound sensor disposed close to the optical filter, the optical-based ultrasound sensor receiving the echo to generate the ultrasound image of the object and receiving the photo-acoustic wave to generate the photo-acoustic image of the object.