Embodiments of the present invention provide for a photoacoustic imaging probe for use in a photoacoustic imaging system, said probe comprising a cohesive composite acoustic lens incorporating aspheric geometry and exhibiting low or practically no measurable dispersion of acoustic waves constructed of at least one material with a low acoustic impedance and attenuation and a relatively low acoustic velocity and at least one other material with a low acoustic impedance and attenuation and a relatively high acoustic velocity is immersed in preferably a low acoustic velocity and low acoustic impedance fluid. The lens may be designed as an acoustic reflective lens or an acoustic lens incorporating spheric geometry. The lens focuses acoustic waves on an acoustic imager which detects the image. The lens may be considered to be essentially monochromatic.
