本文選題：一體化Y型腔正交偏振雙頻激光器 + 頻差閉鎖�。� 參考：《國防科學(xué)技術(shù)大學(xué)》2015年碩士論文

【摘要】：雙頻激光器廣泛應(yīng)用于干涉和光學(xué)傳感測量領(lǐng)域,其測量精度和量程決定于雙頻激光器頻差穩(wěn)定性以及頻差輸出范圍。Y型腔正交偏振雙頻激光器具有零頻差閉鎖、頻差輸出范圍大、高頻差穩(wěn)定性等潛在優(yōu)勢,有望在高速大量值以及精密測量中發(fā)揮重要作用。本文主要研究一體化Y型腔正交偏振雙頻激光器頻差閉鎖、頻差穩(wěn)定性及其在微力測量中的應(yīng)用。為進(jìn)一步改善Y型腔正交偏振雙頻激光器性能,推進(jìn)其在精密加速度、微力測量等領(lǐng)域的應(yīng)用提供理論與實(shí)驗依據(jù)。首先對影響Y型腔正交偏振雙頻激光器閉鎖閾值頻差的因素進(jìn)行了系統(tǒng)分析。理論分析了工作點(diǎn)、泵浦電流以及損耗等因素對激光器閉鎖閾值頻差影響,實(shí)驗重點(diǎn)研究了泵浦電流和工作點(diǎn)對閉鎖閾值頻差影響。在電流允許范圍內(nèi),激光器閉鎖閾值頻差隨泵浦電流值增大而減小;工作點(diǎn)越靠近增益曲線中心,激光器閉鎖閾值頻差越小。泵浦電流大于2.2mA時,調(diào)節(jié)激光器公共腔長獲得最佳工作點(diǎn),激光器閉鎖閾值頻差可降至幾MHz。系統(tǒng)研究了磁場抑制Y型腔正交偏振雙頻激光器頻差閉鎖問題。從磁光效應(yīng)出發(fā),理論分析了磁場抑制雙頻激光器頻差閉鎖原理。利用方體線圈產(chǎn)生均勻磁場,通過Ansoft Maxwell軟件對方體線圈內(nèi)磁場分布進(jìn)行了仿真分析。對橫向磁場抑制Y型腔正交偏振雙頻激光器頻差閉鎖效果進(jìn)行了實(shí)驗研究,結(jié)果表明,泵浦電流為1.8mA條件下,當(dāng)磁場強(qiáng)度大于10mT時,激光器閉鎖閾值頻差可降至幾十KHz,實(shí)現(xiàn)了激光器的零頻差閉鎖。對Y型腔正交偏振雙頻激光器頻差穩(wěn)定性進(jìn)行了研究。理論與實(shí)驗研究表明,環(huán)境氣流、泵浦電流穩(wěn)定性以及溫度分布是影響雙頻激光器頻差穩(wěn)定性主要因素。激光器自身熱源帶來的兩子腔溫度梯度隨機(jī)變化成為限制激光器頻差穩(wěn)定性提高的關(guān)鍵因素。利用Y型腔正交偏振雙頻激光器搭建了氣體膜盒結(jié)構(gòu)微力測量系統(tǒng),開展了靜態(tài)微力測量實(shí)驗研究。采用大撓度下的集中力模型對微力測量原理進(jìn)行了理論推導(dǎo),通過實(shí)驗對微力測量系統(tǒng)性能進(jìn)行了分析。實(shí)驗表明,當(dāng)力值小于7mN時,激光器輸出頻差變化量與待測力間成線性關(guān)系,比例因子為1.23842×10~9Hz/N;待測力大于7mN后,激光器頻差變化量發(fā)生非線性變化。激光器頻差漂移及待測力作用點(diǎn)成為影響微力測量系統(tǒng)精度的主要因素。
[Abstract]:Dual-frequency lasers are widely used in the fields of interferometry and optical sensing measurement. The accuracy and range of measurement are determined by the stability of the frequency difference of the dual-frequency laser and the output range of the frequency difference. Y-cavity orthogonal polarization dual-frequency laser has zero frequency difference locking. The potential advantages of wide output range of frequency difference and stability of high frequency difference are expected to play an important role in high speed and large value and precision measurement. In this paper, the frequency difference locking, frequency difference stability and its application in micro-force measurement of an integrated Y-cavity quadrature polarization dual-frequency laser are studied. It provides theoretical and experimental basis for further improving the performance of Y-cavity orthogonal polarization dual-frequency laser and promoting its application in the fields of precision acceleration and micro-force measurement. Firstly, the factors influencing the locking threshold frequency difference of Y cavity orthogonal polarization dual frequency laser are analyzed systematically. The effects of operating point, pump current and loss on the frequency difference of laser latchup threshold are analyzed theoretically. The effects of pump current and operating point on the latch-up threshold frequency difference are studied in the experiment. The threshold frequency difference of the laser latching decreases with the increase of the pump current, and the closer the operating point is to the center of the gain curve, the smaller the frequency difference of the latching threshold is. When the pump current is greater than 2.2mA, the optimal operating point can be obtained by adjusting the length of the common cavity, and the frequency difference of the latching threshold can be reduced to several MHz. The problem of frequency difference latchup of Y-cavity orthogonal polarization dual-frequency laser with magnetic field suppression is studied systematically. Based on the magneto-optic effect, the principle of frequency difference latchup of magnetic field suppression dual frequency laser is theoretically analyzed. The uniform magnetic field is generated by the square coil, and the magnetic field distribution in the coils is simulated by Ansoft Maxwell software. The effect of transverse magnetic field on the suppression of frequency difference latchup of Y-cavity orthogonal polarization dual-frequency laser is studied experimentally. The results show that when the pump current is 1.8mA, the magnetic field intensity is greater than 10mT. The threshold frequency difference of laser latching can be reduced to dozens of kHz, and the zero frequency difference latchup of laser is realized. The frequency difference stability of Y cavity orthogonal polarization dual frequency laser is studied. Theoretical and experimental studies show that the ambient flow, pump current stability and temperature distribution are the main factors affecting the stability of the frequency difference of the dual-frequency laser. The random variation of the temperature gradient of the two subcavities caused by the laser's own heat source is the key factor to limit the stability of the laser frequency difference. Using Y-cavity orthogonal polarization dual-frequency laser, a gas diaphragm structure micro-force measurement system is built, and the static micro-force measurement experiment is carried out. The principle of micro-force measurement is derived theoretically by using the concentrated force model under large deflection, and the performance of micro-force measurement system is analyzed by experiments. The experimental results show that when the force value is less than 7mN, there is a linear relationship between the output frequency difference and the force to be measured, and the ratio factor is 1.23842 脳 10 ~ (9) Hz / N, and when the force is larger than 7mN, the variation of laser frequency difference is nonlinear. The laser frequency shift and the application point of the force to be measured are the main factors that affect the precision of the micro-force measurement system.
【學(xué)位授予單位】：國防科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN248

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本文編號：1978246