A Fabry-Perot interferometer , comprising: - a first mirror plate comprising a first semi-transparent mirror (M1), - a second mirror plate comprising a second semi-transparent mirror (M2) to define an optical cavity together with the first mirror (M1), - three actuators (ACU1, ACU2, ACU3) to change the distance (d F ) between the first mirror (M1) and the second mirror (M2), and - one or more first supporting elements (S1) to support the first mirror plate , wherein the first mirror plate has a first substantially planar surface (SRF11) and a second substantially planar surface (SRF12) defining the maximum thickness (h 100 ) of the first mirror plate , wherein the first mirror plate is bonded to the one or more first supporting elements (S1) by three or more joints (J1), wherein each joint (J1) is bonded to the first mirror plate at a bonding region (REG1), wherein the distance (d 1 ) between each bonding region (REG1) and the first substantially planar surface (SRF11) is greater than 30% of the thickness (h 100 ) of the mirror plate , and the distance (d 2 ) between each bonding region (REG1) and the second substantially planar surface (SRF12) is greater than 30% of the thickness (h 100 ) of the mirror plate , characterized in that each bonding region (REG1) of the first mirror plate is substantially perpendicular to the first substantially planar surface (SRF11) of the first mirror plate , wherein the interferometer further comprises one or more second supporting elements (S1), and a base plate (BASE1), wherein the first mirror plate is attached to the base plate (BASE1) by the one or more first supporting elements (S1), wherein the second mirror plate is attached to the actuators (ACU1, ACU2, ACU3) by the one or more second supporting elements (S1), wherein the actuators (ACU1, ACU2, ACU3) are bonded to the base plate (BASE1), and wherein the distance (d F ) between the first mirror (M1) and the second mirror (M2) is in the range of 0.2 μm to 10 μm. - a first mirror plate comprising a first semi-transparent mirror (M1), - a second mirror plate comprising a second semi-transparent mirror (M2) to define an optical cavity together with the first mirror (M1), - three actuators (ACU1, ACU2, ACU3) to change the distance (d F ) between the first mirror (M1) and the second mirror (M2), and - one or more first supporting elements (S1) to support the first mirror plate , wherein the first mirror plate has a first substantially planar surface (SRF11) and a second substantially planar surface (SRF12) defining the maximum thickness (h 100 ) of the first mirror plate , wherein the first mirror plate is bonded to the one or more first supporting elements (S1) by three or more joints (J1), wherein each joint (J1) is bonded to the first mirror plate at a bonding region (REG1), wherein the distance (d 1 ) between each bonding region (REG1) and the first substantially planar surface (SRF11) is greater than 30% of the thickness (h 100 ) of the mirror plate , and the distance (d 2 ) between each bonding region (REG1) and the second substantially planar surface (SRF12) is greater than 30% of the thickness (h 100 ) of the mirror plate , characterized in that each bonding region (REG1) of the first mirror plate is substantially perpendicular to the first substantially planar surface (SRF11) of the first mirror plate , wherein the interferometer further comprises one or more second supporting elements (S1), and a base plate (BASE1), wherein the first mirror plate is attached to the base plate (BASE1) by the one or more first supporting elements (S1), wherein the second mirror plate is attached to the actuators (ACU1, ACU2, ACU3) by the one or more second supporting elements (S1), wherein the actuators (ACU1, ACU2, ACU3) are bonded to the base plate (BASE1), and wherein the distance (d F ) between the first mirror (M1) and the second mirror (M2) is in the range of 0.2 μm to 10 μm. <EOS>