Laser spectrum detection is an important technology which is used in laser reconnaissance and laser warning receiver.
The identification of the laser spectrum can provide the information for optic-electronic countermeasure. On the basis of
analysis of and research on the current laser spectrum detection technology, a passive laser spectrum detection system
based on the theory of coherent spectrum detection and Fourier Transform spectrum detection technology was designed.
The fiber optical antenna and modified wedge interferometer are system's important component parts, and the
parameters of them are expatiated detailedly. The spectrum information was obtained after the Opto-Electronic transform
by liner charge couple device (CCD) and Fourier transform by fast digital signal processor (DSP). The design method
and the structure principle of key parts were analyzed detailedly in this paper, it also consisted the correlative
performance analyze and setting up of experiment system. The result shows that the measure of wavelength of eight
different semiconductor lasers, The test results indicate that the response time of the designed system is less than 10ms
and the wavelength resolution is less than 10nm.