高功率窄線寬光纖激光研究及其工程化
發(fā)布時(shí)間：2018-11-09 08:54
【摘要】：光纖激光器相比于傳統(tǒng)固體激光具有光束質(zhì)量好、轉(zhuǎn)化效率高、結(jié)構(gòu)緊湊及穩(wěn)定性高等優(yōu)點(diǎn),可廣泛應(yīng)用于光纖通信、醫(yī)學(xué)治療、激光雷達(dá)、激光倍頻、光束相干合成等眾多領(lǐng)域。高功率、窄線寬光纖激光器是目前光纖激光器研究的主要目標(biāo)和熱點(diǎn)之一。受激布里淵散射(SBS)是光纖中一種非常重要的非線性效應(yīng),對(duì)于單頻光纖激光器來(lái)說(shuō),SBS效應(yīng)的低閾值限制了窄線寬光纖激光器的功率提升,如何有效抑制SBS效應(yīng)是提高窄線寬光纖激光器功率的難點(diǎn)。本文首先設(shè)計(jì)并搭建一套中心波長(zhǎng)分別為1064 nm和1030 nm的兩級(jí)主振蕩功率放大(MOPA)全光纖激光系統(tǒng),分析和研究了SBS效應(yīng)對(duì)兩種不同波長(zhǎng)單頻種子源功率放大的影響,同時(shí)對(duì)不同波長(zhǎng)的單頻激光器在放大過(guò)程中的差異性進(jìn)行對(duì)比研究。結(jié)果發(fā)現(xiàn)當(dāng)兩者輸出光功率分別大于20.4 W和21.2 W時(shí),均出現(xiàn)較為嚴(yán)重的SBS,表明想獲得更高功率的輸出,必需采取有效措施對(duì)SBS效應(yīng)進(jìn)行抑制,防止反向散射光功率急劇增加。其次,以白噪聲作為射頻信號(hào)源,采用相位調(diào)制技術(shù),設(shè)計(jì)并搭建了一套三級(jí)MOPA全光纖激光系統(tǒng),分析和研究了信號(hào)光頻譜寬度與光纖放大器系統(tǒng)SBS閾值之間的關(guān)系,通過(guò)改變白噪聲信號(hào)的幅值,實(shí)現(xiàn)精確控制信號(hào)光譜寬,獲得了中心波長(zhǎng)為1030.60 nm、線寬為0.9 GHz、平均功率為75 W的窄線寬準(zhǔn)連續(xù)近衍射極限激光輸出,相應(yīng)的X方向與Y方向的光束質(zhì)量因子分別為M2X=1.23,M2Y=1.24。最后,本文對(duì)基于白噪聲相位調(diào)制的全光纖激光放大器進(jìn)行電學(xué)、機(jī)械及熱管理等系統(tǒng)設(shè)計(jì),初步完成了一臺(tái)高功率、窄線寬全光纖激光放大器工程化樣機(jī)的制作,并進(jìn)行了工程化測(cè)試,獲得了中心波長(zhǎng)為1030.60 nm、譜寬為0.9 GHz、平均功率為75 W的窄線寬準(zhǔn)連續(xù)近衍射極限激光輸出。本文的研究工作有望為實(shí)現(xiàn)更高功率單頻窄線寬光纖激光器的產(chǎn)業(yè)化提供可靠的理論依據(jù)和實(shí)驗(yàn)基礎(chǔ)。
[Abstract]:Compared with conventional solid-state lasers, fiber lasers have the advantages of good beam quality, high conversion efficiency, compact structure and high stability. They can be widely used in optical fiber communication, medical treatment, lidar, laser frequency doubling, etc. Beam coherent synthesis and many other fields. High power, narrow linewidth fiber laser is one of the main targets and hot spots in fiber laser research. Stimulated Brillouin scattering (SBS) is a very important nonlinear effect in fiber. For a single frequency fiber laser, the low threshold of SBS effect limits the power increase of narrow linewidth fiber laser. How to effectively suppress the SBS effect is a difficult problem to improve the power of narrow linewidth fiber laser. In this paper, a two-stage main oscillator power amplifier (MOPA) all-fiber laser system with central wavelength of 1064 nm and 1030 nm is designed and constructed. The effect of SBS effect on the power amplification of two different wavelength single-frequency seed sources is analyzed and studied. At the same time, the difference in amplification process of single frequency laser with different wavelengths is compared and studied. The results show that when the output optical power is more than 20.4W and 21.2W, both of them have more serious SBS, which indicates that it is necessary to take effective measures to suppress the SBS effect in order to obtain higher output power. Prevent a sharp increase in the power of backscattered light. Secondly, using white noise as radio frequency signal source and phase modulation technology, a three-stage MOPA all-fiber laser system is designed and built. The relationship between signal optical spectrum width and SBS threshold of fiber amplifier system is analyzed and studied. By changing the amplitude of the white noise signal, the spectral width of the signal can be accurately controlled, and the narrow linewidth of the center wavelength of 1030.60 nm, line width of 0.9 GHz, average power of 75 W is obtained, and the narrow linewidth quasi-continuous near-diffraction limit laser output is obtained. The corresponding beam quality factors in X direction and Y direction are M2XO 1.23 and M2YN 1.24, respectively. Finally, the electrical, mechanical and thermal management system of all-fiber laser amplifier based on white noise phase modulation is designed, and a prototype of high-power, narrow-linewidth all-fiber laser amplifier is made. The narrow linewidth quasi-continuous near diffraction limit laser output with 1030.60 nm, spectral width of 0.9 GHz, average power of 75 W has been obtained by engineering test. The research work in this paper is expected to provide a reliable theoretical and experimental basis for the industrialization of high-power single-frequency narrow linewidth fiber lasers.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN248
本文編號(hào)：2319941
[Abstract]:Compared with conventional solid-state lasers, fiber lasers have the advantages of good beam quality, high conversion efficiency, compact structure and high stability. They can be widely used in optical fiber communication, medical treatment, lidar, laser frequency doubling, etc. Beam coherent synthesis and many other fields. High power, narrow linewidth fiber laser is one of the main targets and hot spots in fiber laser research. Stimulated Brillouin scattering (SBS) is a very important nonlinear effect in fiber. For a single frequency fiber laser, the low threshold of SBS effect limits the power increase of narrow linewidth fiber laser. How to effectively suppress the SBS effect is a difficult problem to improve the power of narrow linewidth fiber laser. In this paper, a two-stage main oscillator power amplifier (MOPA) all-fiber laser system with central wavelength of 1064 nm and 1030 nm is designed and constructed. The effect of SBS effect on the power amplification of two different wavelength single-frequency seed sources is analyzed and studied. At the same time, the difference in amplification process of single frequency laser with different wavelengths is compared and studied. The results show that when the output optical power is more than 20.4W and 21.2W, both of them have more serious SBS, which indicates that it is necessary to take effective measures to suppress the SBS effect in order to obtain higher output power. Prevent a sharp increase in the power of backscattered light. Secondly, using white noise as radio frequency signal source and phase modulation technology, a three-stage MOPA all-fiber laser system is designed and built. The relationship between signal optical spectrum width and SBS threshold of fiber amplifier system is analyzed and studied. By changing the amplitude of the white noise signal, the spectral width of the signal can be accurately controlled, and the narrow linewidth of the center wavelength of 1030.60 nm, line width of 0.9 GHz, average power of 75 W is obtained, and the narrow linewidth quasi-continuous near-diffraction limit laser output is obtained. The corresponding beam quality factors in X direction and Y direction are M2XO 1.23 and M2YN 1.24, respectively. Finally, the electrical, mechanical and thermal management system of all-fiber laser amplifier based on white noise phase modulation is designed, and a prototype of high-power, narrow-linewidth all-fiber laser amplifier is made. The narrow linewidth quasi-continuous near diffraction limit laser output with 1030.60 nm, spectral width of 0.9 GHz, average power of 75 W has been obtained by engineering test. The research work in this paper is expected to provide a reliable theoretical and experimental basis for the industrialization of high-power single-frequency narrow linewidth fiber lasers.
【學(xué)位授予單位】：南京郵電大學(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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