PROBLEM TO BE SOLVED: To provide a photoacoustic mirror that has a high transmission efficiency on an entrance interface to an internal part and an exit interface to an external part and a high reflection efficiency on an acoustic reflection interface.SOLUTION: The photoacoustic mirror includes: a first light entry surface that has a first triangular prism and a second triangular prism, each of which has different acoustic velocities and where the first triangular prism and the second triangular prism are jointed on a joint surface a light exit second surface and a third surface where the acoustic wave entering from the second surface and reflected on the joint surface exits. The photoacoustic mirror is used where the first surface belongs to the first triangular prism, the second surface and the third surface belong to the second triangular prism, and the acoustic velocity in the second triangular prism is lower than that in the first triangular prism.COPYRIGHT: (C)2012,JPO&INPIT【課題】内部への入射界面および外部への出射界面における透過効率が高く、かつ音響反射界面における反射効率が高い光音響ミラーを提供する。【解決手段】互いに音速の異なる第一の三角プリズムと第二の三角プリズムとを有し、第一の三角プリズムと第二の三角プリズムが接合面にて接合されており、光が入射する第一の面と、光が出射する第二の面と、第二の面から入射し接合面で反射した音響波が出射する第三の面とを有し、第一の面は、第一の三角プリズムに属し、前記第二の面および第三の面は、第二の三角プリズムに属し、第一の三角プリズム内の音速より、第二の三角プリズムの音速が低い光音響ミラーを用いる。【選択図】図1
