FIELD: physics.
SUBSTANCE: apparatus includes a first switching unit 17 which performs switching between a first state in which a back beam 12 is combined with a reference beam (a state in which the back beam 12 is directed to a combining unit 22) and a second state, different from the first state (a state in which the beam path for the back beam 12 is blocked or altered). A control unit 18 controls the switching unit 17 to change the first and second states. An interferometric information collecting unit 19 collects interferometric information on the back beam 12 and the reference beam 14 using the reference beam 14 or the back beam 12, detected by a detecting unit 16 in a second state, and the combined beam 15.
EFFECT: obtaining a high-resolution tomographic image owing to removal of noise caused by the autocorrelation component of the back beam.
30 cl, 8 dwg
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