The main working mode of high energy laser system is to focus the transmitting laser beam on target under thecondition that the target is tracked in closed loop by fine tracking module, so that it can be damaged or invalidated.Therefore, in order to achieve this effect, an optical device of common aperture is designed for high energy laser system.The emitting system of this device consists of an off-axis two-trans primary telescope module, a Galileo transmissiontelescope module used in focusing and a beam feeding module composed of dichroic mirror, fast mirror and otheroptical elements; at the same time, the receiving system of this device consists of the same off-axis two-trans primarytelescope module, an imaging module used in fine tracking and the same beam feeding module. Taking incoherentcombination laser in space as incident ray, we use optical design software in both sequential mode and non-sequentialmode to design and simulate this device. The simulation results show that the distribution of spot at 0.5km~5km isobtained after the laser is modulated by different focusing quantities in the focusing telescope module, and the RMSvalue of laser wave front is better than λ/20 for emitting system. In addition, the performance of an imaging opticalsystem composed of the primary telescope module and the fine tracking imaging module approach the diffraction limitafter optimizing, and the system transfer function is greater than 0.6 at 70lp/mm. Such results in this paper confirm thatthe structure of this optical transceiver possesses reasonable structure and reliable performance, which meets therequirements of engineering application for high energy laser system.
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