An optical interfacial element integrated with a high power acoustic resonator to provide for acoustic cleaning of an optical surface or surfaces of the optical interfacial element, comprising: a high power acoustic resonator, wherein the high power acoustic resonator comprises: an acoustic body having a first end and a second end, wherein the first end comprises a base of the acoustic body and the second end defines a surface with an opening disposed in the defined surface configured to provide access to an interior of the acoustic body; a transducer coupled with the first end and configured to vibrate the acoustic body; an optical interfacial element (40, 50, 60, 70, 80, 90, 100, 125, 155) coupled with the acoustic body, disposed at or proximal to the opening and configured to provide for the transmission of electromagnetic radiation into and out of the optical interfacial element (40, 50, 60, 70, 80, 90, 100, 125, 155), wherein: the optical interfacial element (40, 50, 60, 70, 80, 90, 100, 125, 155) is also configured to seal the interior of the acoustic body from an external environment; and the acoustic body is configured to provide for transmitting the vibrations of the acoustic body onto the optical interfacial element to acoustically clean the optical interfacial element (40, 50, 60, 70, 80, 90, 100, 125, 155); characterized by an optical system which is configured to provide an optical path or paths between the first end of the acoustic body and the optical interfacial element (40, 50, 60, 70, 80, 90, 100, 125, 155) located in the opening in the second end of the acoustic body, wherein the optical system passing from the first end to the second end of the acoustic body is disposed entirely within a volume defined by an outer surface of the acoustic body. a high power acoustic resonator, wherein the high power acoustic resonator comprises: an acoustic body having a first end and a second end, wherein the first end comprises a base of the acoustic body and the second end defines a surface with an opening disposed in the defined surface configured to provide access to an interior of the acoustic body; a transducer coupled with the first end and configured to vibrate the acoustic body; an acoustic body having a first end and a second end, wherein the first end comprises a base of the acoustic body and the second end defines a surface with an opening disposed in the defined surface configured to provide access to an interior of the acoustic body; a transducer coupled with the first end and configured to vibrate the acoustic body; an optical interfacial element (40, 50, 60, 70, 80, 90, 100, 125, 155) coupled with the acoustic body, disposed at or proximal to the opening and configured to provide for the transmission of electromagnetic radiation into and out of the optical interfacial element (40, 50, 60, 70, 80, 90, 100, 125, 155), wherein: the optical interfacial element (40, 50, 60, 70, 80, 90, 100, 125, 155) is also configured to seal the interior of the acoustic body from an external environment; and the acoustic body is configured to provide for transmitting the vibrations of the acoustic body onto the optical interfacial element to acoustically clean the optical interfacial element (40, 50, 60, 70, 80, 90, 100, 125, 155); characterized by an optical system which is configured to provide an optical path or paths between the first end of the acoustic body and the optical interfacial element (40, 50, 60, 70, 80, 90, 100, 125, 155) located in the opening in the second end of the acoustic body, wherein the optical system passing from the first end to the second end of the acoustic body is disposed entirely within a volume defined by an outer surface of the acoustic body. the optical interfacial element (40, 50, 60, 70, 80, 90, 100, 125, 155) is also configured to seal the interior of the acoustic body from an external environment; and the acoustic body is configured to provide for transmitting the vibrations of the acoustic body onto the optical interfacial element to acoustically clean the optical interfacial element (40, 50, 60, 70, 80, 90, 100, 125, 155); characterized by an optical system which is configured to provide an optical path or paths between the first end of the acoustic body and the optical interfacial element (40, 50, 60, 70, 80, 90, 100, 125, 155) located in the opening in the second end of the acoustic body, wherein the optical system passing from the first end to the second end of the acoustic body is disposed entirely within a volume defined by an outer surface of the acoustic body.