本文選題：雙腔雙頻固體激光器 + Pound-Drever-Hall穩(wěn)頻　； 參考：《西安理工大學(xué)》2017年碩士論文

【摘要】：大頻差可調(diào)諧雙腔雙頻固體激光器是合成波長絕對(duì)距離干涉測量系統(tǒng)的理想光源。在絕對(duì)距離干涉測量技術(shù)中,不僅要求合成波長具有合適的量值大小,而且要求合成波長具有較高的穩(wěn)定性,以提高測距精度。合成波長的量值大小取決于雙頻激光器的頻差大小,要保證合成波長的穩(wěn)定性,就必須保證雙頻激光器的頻差穩(wěn)定性。因此,開展雙腔雙頻激光器頻率穩(wěn)定技術(shù)研究具有重要的科學(xué)意義和應(yīng)用價(jià)值。本論文在綜述激光穩(wěn)頻技術(shù)研究現(xiàn)狀的基礎(chǔ)上,分析了雙腔雙頻固體激光器的結(jié)構(gòu)特點(diǎn)和工作原理,介紹了傳統(tǒng)Pound-Drever-Hall (PDH)穩(wěn)頻系統(tǒng)的組成和工作原理及特點(diǎn),設(shè)計(jì)了基于正交解調(diào)原理的雙腔雙頻固體激光器PDH穩(wěn)頻方案,采用正交解調(diào)PDH穩(wěn)頻方法,將直線腔和直角腔諧振頻率同時(shí)鎖定在同一 F-P參考腔的兩個(gè)不同諧振峰中心頻率處,從而穩(wěn)定雙頻激光的頻差大小。針對(duì)傳統(tǒng)PDH穩(wěn)頻系統(tǒng)采用移相器所帶來的缺陷,設(shè)計(jì)了無移相器的正交解調(diào)PDH穩(wěn)頻方案,采用正交參考信號(hào)分別提取誤差信號(hào)的同相分量和正交分量,再通過數(shù)字相敏檢波運(yùn)算得到穩(wěn)頻誤差信號(hào)。實(shí)驗(yàn)研究了單腔單頻固體激光器正交解調(diào)PDH鑒頻特性及頻率跟蹤特性。建立了1064nm單頻固體激光器正交解調(diào)PDH鑒頻實(shí)驗(yàn)系統(tǒng),鑒頻系統(tǒng)的線性動(dòng)態(tài)范圍約為8.39MHz,鑒頻靈敏度為24.4mV/MHz,并分析了影響鑒頻靈敏度的主要原因;將正交解調(diào)PDH鑒頻誤差信號(hào)反饋調(diào)節(jié)F-P參考腔的腔長,使F-P腔諧振頻率實(shí)時(shí)跟蹤單頻固體激光器諧振頻率的變化,實(shí)驗(yàn)得到了預(yù)期的頻率跟蹤效果,頻率跟蹤時(shí)長約1h,實(shí)驗(yàn)驗(yàn)證了正交解調(diào)PDH穩(wěn)頻方案是可行的。建立了雙腔雙頻固體激光器正交解調(diào)PDH穩(wěn)頻系統(tǒng),并進(jìn)行了初步實(shí)驗(yàn)研究,研究結(jié)果驗(yàn)證了該穩(wěn)頻方案的可行性。
[Abstract]:Large frequency difference tunable two-cavity double-frequency solid-state laser is an ideal light source for synthetic wavelength absolute distance interferometry system. In absolute distance interferometry, the synthetic wavelength is not only required to have an appropriate value, but also to have high stability to improve the ranging accuracy. The magnitude of the synthetic wavelength depends on the frequency difference of the dual-frequency laser. In order to ensure the stability of the synthetic wavelength, the stability of the frequency difference of the dual-frequency laser must be guaranteed. Therefore, it is of great scientific significance and application value to study the frequency stabilization technology of dual-cavity dual-frequency lasers. On the basis of summarizing the research status of laser frequency stabilization technology, this paper analyzes the structure and working principle of dual-cavity dual-frequency solid-state laser, and introduces the composition, working principle and characteristics of the traditional Pound-Drever-Hall frequency stabilization system. Based on the principle of quadrature demodulation, a dual-cavity dual-frequency solid-state laser PDH frequency stabilization scheme is designed. By using the orthogonal demodulation PDH stabilization method, the resonant frequencies of the linear cavity and the right-angle cavity are locked simultaneously at the central frequencies of two different resonant peaks in the same F-P reference cavity. In order to stabilize the frequency difference of double frequency laser. Aiming at the defects caused by the phase shifter used in the traditional PDH frequency stabilization system, a phase shifter free quadrature demodulation PDH frequency stabilization scheme is designed. The quadrature reference signal is used to extract the in-phase and quadrature components of the error signal, respectively. Then the frequency stabilization error signal is obtained by digital phase sensitive detection operation. The frequency discrimination and frequency tracking characteristics of single cavity single frequency solid state laser with orthogonal demodulation PDH are studied experimentally. The experimental system of 1064nm single-frequency solid-state laser quadrature demodulation PDH frequency discriminator is established. The linear dynamic range of the system is about 8.39 MHz, and the sensitivity of frequency discrimination is 24.4 MV / MHz. the main reasons that affect the frequency discrimination sensitivity are analyzed. The feedback of the quadrature demodulation PDH frequency discrimination error signal is used to adjust the cavity length of the F-P reference cavity, so that the resonant frequency of the F-P resonator can be tracked in real time. The experimental results show that the desired frequency tracking effect is obtained. The frequency tracking time is about 1 h. The experiment results show that the quadrature demodulation PDH stabilization scheme is feasible. A dual-cavity dual-frequency solid-state laser quadrature demodulation PDH frequency stabilization system is established, and a preliminary experimental study is carried out. The research results verify the feasibility of the scheme.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN248

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