本文選題：雙波長激光器　切入點(diǎn)：腔內(nèi)泵浦　出處：《長春理工大學(xué)》2017年碩士論文

【摘要】：如今,雙波長激光固體激光器在各種領(lǐng)域有著十分廣泛的應(yīng)用,比如激光通訊、激光醫(yī)療、光譜分析、激光雷達(dá)、非線性混頻等等。但是現(xiàn)在大部分雙波長激光輸出只由單一晶體實(shí)現(xiàn)雙波長激光躍遷,由于躍遷譜線的發(fā)射截面之間存在差異,使得激射的兩波長之間存在著激烈的增益競爭,所以很難獲得高效穩(wěn)定的雙波長激光輸出。本論文針對這一問題,提出了腔內(nèi)泵浦技術(shù)來實(shí)現(xiàn)雙波長同時(shí)輸出的技術(shù)方案,并開展了相關(guān)的理論分析和實(shí)驗(yàn)研究。1.通過腔內(nèi)泵浦運(yùn)轉(zhuǎn)機(jī)理對其中涉及到的間接泵浦理論、直接泵浦理論、以及準(zhǔn)三能級、四能級激光理論進(jìn)行分析,建立了能夠描述腔內(nèi)泵浦雙波長激光器振蕩機(jī)理和輸出特性的理論模型,在此基礎(chǔ)上對輸出鏡的透過率進(jìn)行了優(yōu)化設(shè)計(jì)。2.運(yùn)用ABCD矩陣模擬了腔內(nèi)泵浦雙波長激光傳輸過程,在此基礎(chǔ)上通過仿真模擬理論進(jìn)行了腔內(nèi)泵浦雙波長激光器的諧振腔設(shè)計(jì),得到了相應(yīng)的諧振腔穩(wěn)區(qū),并確定了能實(shí)現(xiàn)熱穩(wěn)腔的腔鏡參數(shù)。在此基礎(chǔ)上對腔內(nèi)束腰大小以及位置進(jìn)行了模擬,為實(shí)驗(yàn)奠定了理論基礎(chǔ)。3.通過上述腔內(nèi)泵浦雙波長激光器的理論模擬開展了實(shí)驗(yàn)研究:(1)通過Nd:YAG和Nd:YVO4激光增益介質(zhì)來實(shí)現(xiàn)高效率的946nm和1064nm激光輸出。采用808nm間接泵浦作為泵浦源,在泵浦功率為30.5W時(shí),獲得4W的雙波長輸出,此時(shí)946nm和1064nm雙波長激光輸出功率分別為1.1W和2.9W。并且在實(shí)驗(yàn)中,通過調(diào)節(jié)四能級激光增益介質(zhì)的位置實(shí)現(xiàn)了1064nm激光1.0W—2.9W輸出功率可調(diào)節(jié)。(2)隨后對泵浦源更換為879nm激光泵浦源,并開展了直接泵浦腔內(nèi)泵浦實(shí)驗(yàn)。應(yīng)用Nd:GdVO4和Nd:YVO4激光增益介質(zhì)來實(shí)現(xiàn)912nm和1064nm雙波長激光輸出,此種泵浦方式可以有效的緩解激光器的熱效應(yīng),通過對國內(nèi)外論文的調(diào)研得知,這種采用直接泵浦形式實(shí)現(xiàn)腔內(nèi)泵浦雙波長的輸出為國內(nèi)首例。在實(shí)驗(yàn)中,泵浦吸收功率為8.55W時(shí),獲得1.65W的雙波長輸出,此時(shí)912nm和1064nm雙波長激光輸出功率分別為0.58W和1.07W。
[Abstract]:Nowadays, dual-wavelength laser solid-state lasers are widely used in various fields, such as laser communication, laser medical treatment, spectral analysis, lidar, nonlinear mixing and so on.However, most of the double wavelength laser output is only realized by a single crystal. Due to the difference between the emission cross sections of the transition lines, there is a fierce gain competition between the two wavelengths of the stimulated laser.Therefore, it is difficult to obtain high efficient and stable double wavelength laser output.In order to solve this problem, an intracavity pumping technique is proposed to realize the simultaneous output of two wavelengths, and the related theoretical analysis and experimental research are carried out.The indirect pump theory, direct pump theory and quasi-three-level, four-level laser theory are analyzed by the mechanism of intracavity pumping operation.A theoretical model which can describe the oscillation mechanism and output characteristics of intracavity pumped dual-wavelength laser is established, and the transmittance of the output mirror is optimized. 2.The ABCD matrix is used to simulate the propagation process of intracavity pumped dual-wavelength laser. Based on the simulation theory, the cavity design of the intracavity pumped dual-wavelength laser is carried out, and the corresponding cavity stability region is obtained.The parameters of the cavity cavity are determined.On this basis, the size and position of the beam waist in the cavity are simulated, which lays a theoretical foundation for the experiment.Through the theoretical simulation of the intracavity pumped dual-wavelength laser, the experimental study was carried out. The Nd:YAG and Nd:YVO4 laser gain media were used to realize the high efficiency 946nm and 1064nm laser output.When the pump power is 30.5 W, the output power of 946nm and 1064nm is 1.1 W and 2.9 W, respectively.In the experiment, the 1064nm laser 1.0W-2.9W output power can be adjusted by adjusting the position of the four-level laser gain medium. Then the pump source is replaced by the 879nm laser pump source, and the direct pump intracavity pumping experiment is carried out.Using the gain medium of Nd:GdVO4 and Nd:YVO4 laser to realize the double wavelength laser output of 912nm and 1064nm, this kind of pumping method can effectively alleviate the thermal effect of laser.It is the first case in our country that the double wavelength output of intracavity pump is realized by direct pumping.In the experiment, when the pump absorption power is 8.55W, the two-wavelength output of 1.65W is obtained, and the output power of 912nm and 1064nm dual-wavelength laser is 0.58W and 1.07W, respectively.
【學(xué)位授予單位】：長春理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN248

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