Font Size: a A A

Research On Enlarging The Optical Power By Injection Locking In Cold Atom Experiments

Posted on:2017-12-29Degree:MasterType:Thesis
Country:ChinaCandidate:D WangFull Text:PDF
GTID:2348330509459810Subject:Radio Physics
Abstract/Summary:PDF Full Text Request
In the experiments of atom interferometry gravity measurement, laser plays an important role. Laser with different frequency and power are used in atom cooling and trapping, launching and state preparation, interferometry and detection process. When cooling and trapping atoms, laser with high power, stable frequency and narrow line width is needed. Injection locking technique can get such laser. Injection locking refers to using a master laser with low power, single mode and narrow line width as a seed to inject into a high power slave laser, under certain condition, the high power slave laser will be locked by the injecting laser. The frequency, phase and polarization of the high power laser will be same as the injecting seed laser. In this way, laser with high power, single mode and narrow line width is obtained.During the period of my master, high power FP laser is obtained, which meets the requirement and is used as the slave laser in the injection locking experiment.In the injection locking experiment, DBR laser is used as the master laser, FP laser is used as the slave laser. The FP laser control circuit is made, including current source circuit and temperature control circuit. Because current and temperature are important factors that affect the laser output characteristics, so the current source and the temperature control system should be of high performance. Through experimental tests, stability of the current source is 20?A and 4-hours stability is 0.1%; temperature control precision is better than 1mK with stability better than 0.01% in 11 hours.In experiments, three sets of lasers are made. The second set of laser improves temperature control structure of the first set and gets laser with power of 77 m W and wavelength of 780.2464 nm by injection locking. The third set of laser replaces the laser tube of the second set with one of bigger power, and gets laser with power of 150 m W and wavelength of 780.2464 nm. Some characteristics of injection locking are tested, including locking condition, locking stability and locking range. Summary of the injection locking experiment is given at the end of the paper, and some suggestions for future work are put forward.
Keywords/Search Tags:injection locking, laser, current source, temperature control
PDF Full Text Request
Related items