A device for measuring parameters of phase elements comprising a low-coherence light source (1.1), connected to an input fiber optic coupler (2.1) splitting the light from the low-coherence light source (1.1) to a reference arm and a measurement arm, a detector (7.1) configured to receive light from reference arm and measurement arm, wherein the reference arm comprises a collimator (4.1, 4.2) located on a linear stage, characterized in that, said device further has a second fiber optic coupler (2.2) connected to a second light source (1.2) delivering light to the reference arm and measurement arm and a second detector (7.2) receiving light from reference arm and measurement arm, wherein the linear stage is motorized linear stage and the second light source (1.2) is coherent light source having a coherence length greater or equal to the range of motion of the motorized linear stage, and wherein the measurement arm comprises: a first measurement collimator (3.1) connected to the input optical coupler (2.1) and facing a free space, which is adapted to receive measured phase element (5.1, 5.3, 5.4), a second measurement collimator (3.2) located at the opposite side of the free space and facing the first measurement collimator (3.1), the second measurement collimator (3.2) being connected to the second fiber optic coupler (2.2), and the reference arm comprises: a first reference collimator (4.1) connected to the input fiber optic coupler (2.1) and facing a second reference collimator (4.2) connected to the second fiber optic coupler (2.2) wherein the second reference collimator (4.2) is located on the motorized linear stage, wherein the input optical coupler (2.1) is connected to the second detector (7.2), and the second optical coupler (2.2) is connected to the first detector (7.1) and the second light source (1.2). a low-coherence light source (1.1), connected to an input fiber optic coupler (2.1) splitting the light from the low-coherence light source (1.1) to a reference arm and a measurement arm, a detector (7.1) configured to receive light from reference arm and measurement arm, wherein the reference arm comprises a collimator (4.1, 4.2) located on a linear stage, characterized in that, said device further has a second fiber optic coupler (2.2) connected to a second light source (1.2) delivering light to the reference arm and measurement arm and a second detector (7.2) receiving light from reference arm and measurement arm, wherein the linear stage is motorized linear stage and the second light source (1.2) is coherent light source having a coherence length greater or equal to the range of motion of the motorized linear stage, and wherein the measurement arm comprises: a first measurement collimator (3.1) connected to the input optical coupler (2.1) and facing a free space, which is adapted to receive measured phase element (5.1, 5.3, 5.4), a second measurement collimator (3.2) located at the opposite side of the free space and facing the first measurement collimator (3.1), the second measurement collimator (3.2) being connected to the second fiber optic coupler (2.2), and a first measurement collimator (3.1) connected to the input optical coupler (2.1) and facing a free space, which is adapted to receive measured phase element (5.1, 5.3, 5.4), a second measurement collimator (3.2) located at the opposite side of the free space and facing the first measurement collimator (3.1), the second measurement collimator (3.2) being connected to the second fiber optic coupler (2.2), and the reference arm comprises: a first reference collimator (4.1) connected to the input fiber optic coupler (2.1) and facing a second reference collimator (4.2) connected to the second fiber optic coupler (2.2) wherein the second reference collimator (4.2) is located on the motorized linear stage, wherein the input optical coupler (2.1) is connected to the second detector (7.2), and the second optical coupler (2.2) is connected to the first detector (7.1) and the second light source (1.2).