DFB Diode Laser Frequency Doubling And Frequency Locking Via MTS

This thesis presents a new integrated optical system. We make theoretical analysis and research on two key techniques in this system—the second harmonic of laser from distributed feedback laser diode (DFB-LD) and it’s frequency locking. At last, High power780nm laser can be get by frequency multiplicate the high power continuously wave1560nm which has been amplified by EDFA.Over time, the central frequency of a diode laser will drift, so stabilizing the laser becomes important to suits the remand of stable and narrow line width laser in our experiment. So, modulation transfer spectroscopy (MTS) which shield from outside magnitude changes and has a steep slope is used to lock DFB-LD.In Chapter1, the background of atom interferometers and the new optical system we designed is introduced.In Chapter2, the principle of diode laser and DFB-LD is illustrated.In Chapter3, the principle of nonlinear optic and the theory of second harmonic generation are briefly summarized. It has a relationship between temperature and efficiency of second harmonic generation, so we made a temperature control system to get high efficiency, more stable780nm laser.In Chapter4, the normal way of stabling the DFB-LD is briefly presented. We choose MTS to lock DFB-LD, which is less affected by external environment and has a steep slope. Finally, the MTS theory and methods to improve SNR of MTS signal are summarized.In Chapter5, the whole work is summarized and the advice of the improvement of the system is given.