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High frequency stability of semiconductor lasers in atomic spectroscopy, high resolution spectroscopy, quantum metrology, optical fiber communications , laser measuring and laser cooling of atoms in a series of basic research and high-tech product development in a wide range of applications, the stability of the semiconductor laser frequency of great significance for the characterization of laser frequency stabilization degree of frequency stability measurement also has a certain research value. The laser frequency is about 1014 ~ 1015HZ, direct measurement of the laser frequency stability is very difficult. Theoretical analysis shows that the laser frequency stability beat frequencies with the same degree of stability . This paper presents a measuring instrument, the beat frequency technique based on semiconductor laser frequency stability for relative measurements. First acousto-optic modulator using a laser frequency, having a frequency difference generating two light beams , and then by mixing optical device , the \signal , and then be converted by the photo detector into an electrical signal , the circuit design of the photodetector signal amplification , filtering, pulse converter , based on LPC2214 ARM7 TDMI experimental chip hardware platform using Allan variance calculation process data , laser drawn relative frequency stability. The experimental results show that we have developed measurement system with measurement of rapid , intuitive display , easy to operate , easy to manufacture , low cost , accurate , high precision characteristics. Therefore, the measurement system has some practical value , can be widely used in the semiconductor laser stability tests, may also apply to some of the other laser frequency stability performance of the test .
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