698nm超穩(wěn)激光器優(yōu)化研究
發(fā)布時間：2018-08-12 18:00
【摘要】：具有極高頻率穩(wěn)定性的穩(wěn)頻激光在高分辨率光譜學、光鐘、量子信息科學、引力波探測等領域具有重要應用。特別是在時間頻率領域,由于其優(yōu)越的性能和矚目的進展,鍶原子光鐘有望成為下一代頻率標準。鍶原子光鐘參考躍遷線的自然線寬在m Hz量級,為了實現鍶原子參考躍遷線的精密測量,需要研制具有極高頻率穩(wěn)定度的698nm穩(wěn)頻激光。本實驗中,穩(wěn)頻激光系統是以698nm外腔半導體激光器為光源,利用PDH穩(wěn)頻技術將激光頻率鎖定到光學參考腔共振頻率上。2013年,實驗室相關研究人員獲得了1s頻率穩(wěn)定度為1.4×10~（-14）的穩(wěn)頻激光。通過對穩(wěn)頻結果進行分析,針對系統中仍可能存在的問題,本文主要從伺服控制系統、參考腔溫度控制、剩余幅度調制和激光功率等方面開展對698nm穩(wěn)頻激光系統的優(yōu)化研究工作。在測量光學參考腔精細度的實驗中,首次使用偏頻法同時測量了參考腔線寬和誤差信號電壓頻率轉換關系,有效提高了基于高精細度腔穩(wěn)激光系統中誤差信號斜率的測量精度。在剩余幅度抑制實驗中,提出將電光晶體溫度控制在剩余幅度最大點的觀點,有效降低了激光頻率對溫度的敏感度。通過文中一系列優(yōu)化措施,將兩套穩(wěn)頻激光系統進行拍頻比對,測得拍頻信號1s平均時間的頻率穩(wěn)定度為2.65×10~（-15）,其中一套激光系統1s平均時間的頻率穩(wěn)定度優(yōu)于1.87×10~（-15）,較優(yōu)化前穩(wěn)定度提高了約一個量級。
[Abstract]:The steady frequency laser with extremely high frequency stability has important applications in the fields of high resolution spectroscopy, optical clock, quantum information science, gravitational wave detection and so on. Especially in the field of time and frequency, strontium atomic light clock is expected to become the next generation frequency standard due to its superior performance and remarkable progress. The natural linewidth of the reference transition line of strontium atomic clock is in the order of m Hz. In order to realize the precise measurement of the reference transition line of strontium atom, it is necessary to develop 698nm stable frequency laser with very high frequency stability. In this experiment, the frequency stabilized laser system uses 698nm external cavity semiconductor laser as the light source, and uses the PDH frequency stabilization technology to lock the laser frequency onto the optical reference cavity resonance frequency. A frequency stabilized laser with 1 s frequency stability of 1.4 脳 10 ~ (-14) was obtained by laboratory researchers. Through the analysis of the frequency stabilization results, aiming at the possible problems in the system, this paper mainly from the servo control system, reference cavity temperature control, The residual amplitude modulation and laser power are studied on the optimization of 698nm frequency stabilized laser system. In the experiment of measuring the fineness of the optical reference cavity, the bias frequency method is used to measure the relationship between the reference cavity linewidth and the voltage and frequency conversion of the error signal for the first time, which effectively improves the measurement accuracy of the error signal slope in the laser system based on the high precision cavity stabilization. In the residual amplitude suppression experiment, the idea of controlling the temperature of the electro-optic crystal at the maximum residual amplitude is put forward, which effectively reduces the sensitivity of the laser frequency to the temperature. Through a series of optimization measures in this paper, the beat frequency of two stable laser systems is compared. The frequency stability of 1 s average time of beat frequency signal is 2.65 脳 10 ~ (-15). The frequency stability of 1 s average time of a laser system is better than 1.87 脳 10 ~ (-15), which is about one order of magnitude higher than that before optimization.
【學位授予單位】：中國科學院研究生院（國家授時中心）
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN248
本文編號：2179853
[Abstract]:The steady frequency laser with extremely high frequency stability has important applications in the fields of high resolution spectroscopy, optical clock, quantum information science, gravitational wave detection and so on. Especially in the field of time and frequency, strontium atomic light clock is expected to become the next generation frequency standard due to its superior performance and remarkable progress. The natural linewidth of the reference transition line of strontium atomic clock is in the order of m Hz. In order to realize the precise measurement of the reference transition line of strontium atom, it is necessary to develop 698nm stable frequency laser with very high frequency stability. In this experiment, the frequency stabilized laser system uses 698nm external cavity semiconductor laser as the light source, and uses the PDH frequency stabilization technology to lock the laser frequency onto the optical reference cavity resonance frequency. A frequency stabilized laser with 1 s frequency stability of 1.4 脳 10 ~ (-14) was obtained by laboratory researchers. Through the analysis of the frequency stabilization results, aiming at the possible problems in the system, this paper mainly from the servo control system, reference cavity temperature control, The residual amplitude modulation and laser power are studied on the optimization of 698nm frequency stabilized laser system. In the experiment of measuring the fineness of the optical reference cavity, the bias frequency method is used to measure the relationship between the reference cavity linewidth and the voltage and frequency conversion of the error signal for the first time, which effectively improves the measurement accuracy of the error signal slope in the laser system based on the high precision cavity stabilization. In the residual amplitude suppression experiment, the idea of controlling the temperature of the electro-optic crystal at the maximum residual amplitude is put forward, which effectively reduces the sensitivity of the laser frequency to the temperature. Through a series of optimization measures in this paper, the beat frequency of two stable laser systems is compared. The frequency stability of 1 s average time of beat frequency signal is 2.65 脳 10 ~ (-15). The frequency stability of 1 s average time of a laser system is better than 1.87 脳 10 ~ (-15), which is about one order of magnitude higher than that before optimization.
【學位授予單位】：中國科學院研究生院（國家授時中心）
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN248
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，本文編號：2179853
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