An optical relay comprises a first scan mirror configured to receive an input optical beam, and to reflect the input optical beam as a first intermediate optical beam； a telecentric mirror configured to receive the first intermediate optical beam, and to reflect the first intermediate optical beam as a second intermediate optical beam； a second scan mirror configured to receive the second intermediate optical beam, and to reflect the second intermediate optical beam as an output optical beam； and a lens system disposed between the telecentric mirror and the first and second scan mirrors, such that the first intermediate optical beam and the second intermediate optical beam pass through the lens system. The optical relay may be a component of an optical system which further includes an optical engine.
