2007-09-012024-05-16https://scholars.lib.ntu.edu.tw/handle/123456789/669375摘要：我們計畫建造一座最先進的原子磁力測量儀，這座磁力測量儀以鹼金屬原子為介質，可以測量到極微小的磁場變化(約在10-18T Hz-1/2的量級)，其將來可能的應用包括凝態物理實驗之微磁場測量，重力波測量，核磁共振信號，古地磁測量，非破壞磁檢測，及用來作生物磁場的檢測，例如人類大腦，心臟運作時的微量磁場變化。 我們所要建造的原子磁力測量儀，是以共振非線性磁光效應來運作，其中非線性光學的效應(即Faraday activity)是因微小的磁場，造成原子自旋的旋進，而產生的。偏振光進入此原子氣後，其偏振面會因此效應而改變，因此只要能偵測微小的偏振態的不同，即可計算出造成此現象的磁場大小。這個磁力測量儀主要的元件包含原子氣(可用鉀，銣等原子)，驅動及偵測的雷射，及隔絕外界磁場的屏蔽。我們整個團隊有完成這個計畫所需包括磁學，非線性光學等的關鍵技術，本計畫總主持人有二十年以上在SQUID，及核磁共振的實驗經驗，而本子計畫主持人則有超過十年的非線性光學的經驗，這些都是我們在建造此原子磁力測量儀的優勢。 <br> Abstract: In this proposal, we will build a state-of-art atomic magnetometer, which utilize the alkali metal atom as the medium, to measure the tiny change of magnetic field (in the order of 10-18 T Hz-1/2). The potential application of this magnetometer includes condensed-matter experiments, gravitational wave detection, detection of NMR signals, studies of palaeomagnetism, non-destructive testing, underwater ordinance detection, and most importantly as the magnetic field sensors has been in the area of biomagnetism, e.g., detection of the weak magnetic fields produced by the human brain, heart and other organs. This magnetometer to be built is based on the resonant nonlinear magneto-optical effect, in which the nonlinear optical property (Faraday activity) of the atomic gas is changed by very small magnetic field. The detection of the tiny polarization of the probe light field can be traced back to determined the change of the magnetic field. The center pieces of this fT atomic magnetometer are the highly blocking magnetic shield and a pair of pump-probe diode laser system tuned to the transition frequency of the alkali atom. Our main investigator is the expert in magnetics, who has tens of years research on SQUID, NMR and magnetic sensors. The investigator of this subproject also have many years experience in nonlinear optics. The key to the success of building this magnetometer is the combination of the experienced and knowledgeable experts in magnetics and nonlinear optics, which can be perfectly provided by our research team.原子磁力測量儀共振非線性磁光效應atomic magnetometerresonant nonlinear magneto-optical effect