高精度光學頻率合成技術研究
發(fā)布時間:2018-07-05 00:12
本文選題:光學頻率合成 + 光學頻率梳; 參考:《華東師范大學》2017年博士論文
【摘要】:光原子鐘的頻率不穩(wěn)定度和不確定度都已達到1 0-18量級,它們在在基本物理常數(shù)測量、深空導航、測地學等領域具有重要的應用。而這些應用均要求將光原子鐘在某一特定光學波段的輸出信號轉換到其他光學波段或微波波段,從而進行精密測量和比對研究,還要求在轉換過程中不能破壞光原子鐘高頻率穩(wěn)定度、高頻率精度的優(yōu)異性能。因此高精度光學頻率合成技術的研究意義重大。由于光學波段信號的頻率值在1014 Hz量級,遠大于電子元件的響應范圍,所以現(xiàn)有的基于電子技術的微波頻率合成方法很難直接應用于光學頻率合成中。飛秒光學頻率梳可在寬達一個光學倍頻程的波段內同時輸出許多等頻率間隔的頻率成分,這一頻譜特性使其能夠在不同波段的光頻信號之間以及光頻信號和微波信號之間建立聯(lián)系,為進行不同光頻之間的相互轉換提供了便捷的橋梁。本論文研究了高精度、低噪聲的光學分頻技術,通過集成窄線寬飛秒光梳技術和傳輸振蕩器技術,并提出消除微波頻率噪聲的光頻自參考微波頻率基準技術,首次實現(xiàn)了分頻數(shù)可預置光學分頻器。通過此高精度光學分頻器與基于光學倍頻效應的頻率轉換器之間的比對實驗,本文證明了這一高精度光學分頻器在頻率轉換過程中引入的頻率不穩(wěn)定度達到6×10-19(1秒積分時間),分頻不確定度為1.4×10-21。該光學分頻器的精度比目前最精確的光鐘的精度還要好3個數(shù)量級,因此在對光鐘信號進行分頻時不會降低其頻率精度,可滿足世界上最好光鐘的應用要求;诖烁呔裙鈱W分頻技術,本文還將一套線寬為0.7 Hz、頻率不穩(wěn)定度達到1×10-15的1064 nm窄線寬穩(wěn)頻激光的頻率精確轉換到一套可大范圍調諧的鈦寶石單頻連續(xù)激光器,實現(xiàn)了輸出波長在700 nm-990nm范圍內的光學頻率合成器。該光學頻率合成器能在700 nm-990 nm波段中任意指定頻率處實現(xiàn)高精度單頻窄線寬激光輸出。本文將此光學頻率合成器在778.6 nm波段的輸出與另一臺獨立的778.6 nm窄線寬激光進行拍頻測試,證明了此光學頻率合成器輸出激光的平均線寬達到1 Hz,頻率不穩(wěn)定度達到1.5×10-15(1秒積分時間),它主要受限于光學頻率合成器的參考激光的線寬和頻率穩(wěn)定度。在此基礎上,本文還實現(xiàn)了光學頻率合成器在不同波段的多通道同時輸出,并證明了該系統(tǒng)在多通道輸出過程中引入的頻率不穩(wěn)定度為8×10-19,不同通道之間的頻率比值不確定度為2×10-21。高精度光學頻率合成技術的研究可為光鐘應用提供必要的工具,同時為開展精密光譜和精密測量等領域的研究提供了有效的技術手段。
[Abstract]:The frequency instability and uncertainty of the optical atomic clocks have reached 10-18 orders of magnitude. They have important applications in the fields of basic physical constants, deep space navigation, geodesy and other fields. These applications require that the output signals of the optical atomic clocks be transferred to other optical or microwave bands in a particular optical band. Precision measurement and comparison study also require that the high frequency stability and high frequency accuracy of the optical atomic clock can not be destroyed during the conversion process. Therefore, the research of high precision optical frequency synthesis is of great significance. Because the frequency value of the optical band signal is at the magnitude of 1014 Hz, it is far larger than the response range of the electronic components, so the existing base The microwave frequency synthesis method in electronic technology is difficult to apply directly to the optical frequency synthesis. The femtosecond optical frequency comb can simultaneously output a number of frequency components with equal frequency intervals within a band of one optical frequency multiplier, which makes it able to be between the optical frequency signals of different bands, as well as the optical and microwave signals. In this paper, a high precision and low noise optical frequency division technology is studied in this paper. By integrating the narrow linewidth femtosecond combing technology and the transmission oscillator technology, the optical frequency reference frequency reference technology for eliminating the microwave frequency noise is proposed for the first time. Through comparison experiments between this high-precision optical frequency divider and frequency converter based on optical frequency multiplier effect, this paper proves that the frequency instability of this high precision optical frequency divider is 6 * 10-19 (1 second integral time), and the frequency division uncertainty is 1.4 * 10-21. The precision of the optical frequency divider is 3 orders of magnitude better than the precision of the most accurate clock. Therefore, the frequency accuracy of the clock signal will not be reduced, and the application requirement of the best clock in the world is met. Based on this high precision optical frequency division technique, a set of line width is 0.7 Hz and the frequency instability reaches 1 * 10. The frequency of the 1064 nm narrow line width and frequency stabilization laser of the -15 is accurately converted to a range of tunable titanium gem single frequency CW lasers. The optical frequency synthesizer of the output wavelength in the range of 700 nm-990nm is realized. The optical frequency synthesizer can achieve high precision single frequency narrow linewidth laser transmission at any specified frequency rate in the 700 nm-990 nm band. In this paper, the output of this optical frequency synthesizer in 778.6 nm band and another independent 778.6 nm narrow line width laser is tested. It is proved that the average line width of the output laser of the optical frequency synthesizer reaches 1 Hz and the frequency instability reaches 1.5 * 10-15 (1 second integration time). It is mainly limited to the reference of the optical frequency synthesizer. On the basis of this, the multi channel simultaneous output of the optical frequency synthesizer at different wavelengths is realized, and the frequency instability of the system is 8 * 10-19, the frequency ratio uncertainty between different channels is 2 * 10-21. high precision optical frequency coincidence. The research of technology can provide the necessary tools for the application of optical clock, and also provide effective technical means for the research of precision spectroscopy and precision measurement.
【學位授予單位】:華東師范大學
【學位級別】:博士
【學位授予年份】:2017
【分類號】:TN74
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1 劉永順;許樹玲;;淺談頻率合成技術及其發(fā)展[J];安陽師范學院學報;2006年02期
2 楊j,
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