本文選題：被動鎖模光纖激光器 + 增益開關(guān)　； 參考：《深圳大學(xué)》2017年碩士論文

【摘要】：超連續(xù)譜光源具有超寬帶、高亮度和高空間相干性等優(yōu)點,是光學(xué)相干攝影術(shù)、光譜分析、生物成像、光學(xué)相干斷層成像、高精度光學(xué)頻率測量和波分復(fù)用光通信系統(tǒng)等領(lǐng)域的理想光源。研究超連續(xù)譜的產(chǎn)生機制,不僅具有重要的學(xué)術(shù)意義,而且具有非常重要的實際應(yīng)用價值。本文圍繞該主題研究的內(nèi)容如下:1.闡述了基于可飽和吸收體的被動鎖模摻鐿光纖激光器的發(fā)展概況、增益開關(guān)半導(dǎo)體激光器的發(fā)展概況、超連續(xù)譜光源的發(fā)展概況以及簡單介紹了光子晶體光纖的特性。2.采用基于SESAM的鎖模技術(shù)搭建了中心波長處在1030.28 nm、脈沖寬度達到4.6 ps的脈沖種子源,進而通過使用三級MOPA光纖放大器將脈沖激光的平均功率放大至8.62 W,最后將其用于泵浦零色散波長處在1030 nm的8 m PCF,獲得了帶寬為1740 nm(460~2200 nm)、輸出功率為3.51 W的超連續(xù)譜光源。3.采用基于SESAM的鎖模技術(shù)搭建了中心波長處在1064.32 nm、脈沖寬度達到13.6 ps的脈沖種子源,進而通過使用三級MOPA光纖放大器將脈沖激光的平均功率放大至13.50 W,最后將其用于泵浦零色散波長處在1030 nm的8 m PCF,獲得了帶寬為1750 nm(450~2200 nm)、輸出功率為3.65 W的超連續(xù)譜光源。4.采用基于SESAM的鎖模技術(shù)搭建了雙波長類噪聲脈沖光纖激光器,其中心波長分別為1064.15 nm和1064.98 nm。通過使用四級MOPA光纖放大器將脈沖激光的平均功率放大至17.10 W,最后將其用于泵浦零色散波長處在1030 nm的4 m和8 m PCF。當PCF的長度為4 m時,最大光譜帶寬達到了1910 nm(450~2360 nm),而此時的輸出功率為7.09 W,光-光轉(zhuǎn)化效率達到了58.21%,功率穩(wěn)定性約為0.51%。當PCF的長度為8 m時,其最大光譜帶寬達到了1754 nm(446~2200 nm),其中3-dB帶寬(不計剩余泵浦光及ASE光)達到了1740 nm(460~2200 nm),占全帶寬的99.20%,而此時的輸出功率達到了4.04 W。5.通過使用增益開關(guān)技術(shù)對半導(dǎo)體激光器進行增益調(diào)制,獲得了中心波長為1052.99 nm類噪聲脈沖種子源。通過使用四級MOPA光纖放大器將脈沖激光的平均功率放大至16.91 W,最后將其用于泵浦零色散波長處在1030 nm的4 m、5 m和8 m PCF。在重復(fù)頻率為5 MHz時,其最短波長達到了415 nm(8 m PCF),為了進一步使光譜往短波方向展寬,我們將激光重復(fù)頻率降低至2 MHz,最終使超連續(xù)譜在短波方向展寬至390 nm(4 m PCF),并被組裝成超連續(xù)譜光源樣機。
[Abstract]:The supercontinuous spectral light source has the advantages of ultra-wideband, high brightness and high spatial coherence. It is optical coherence photography, spectral analysis, biological imaging, optical coherence tomography, etc. Ideal light source for high-precision optical frequency measurement and wavelength division multiplexing optical communication systems. It is not only of great academic significance to study the generation mechanism of supercontinuum spectrum, but also of great practical application value. The contents of this thesis are as follows: 1. The development of passive mode-locked ytterbium-doped fiber laser based on saturable absorber, the development of gain switched semiconductor laser, the development of supercontinuum spectrum light source and the characteristics of photonic crystal fiber. A pulse seed source with a central wavelength of 1030.28 nm and a pulse width of 4.6 PS was constructed using the mode-locking technique based on SESAM. Furthermore, the average power of pulsed laser is amplified to 8.62 W by using three-stage MOPA fiber amplifier. Finally, it is used to pump 8m PCF with zero dispersion wavelength at 1030 nm. A supercontinuum light source of 1740 nm(460~2200 nm bandwidth and 3.51 W output power is obtained. A pulse seed source with a central wavelength of 1064.32 nm and a pulse width of 13.6ps was constructed using the mode-locking technique based on SESAM. Then, the average power of pulsed laser is amplified to 13.50W by using three-stage MOPA fiber amplifier. Finally, it is used to pump 8m PCF with zero dispersion wavelength at 1030 nm. A supercontinuum light source with a bandwidth of 1750 nm(450~2200 nm and an output power of 3.65 W is obtained. A dual-wavelength noise-like pulsed fiber laser with center wavelengths of 1064.15 nm and 1064.98 nm was constructed using mode-locking technique based on SESAM. The average power of the pulsed laser is amplified to 17.10 W by using a four-stage MOPA fiber amplifier. Finally, it is used to pump 4 m and 8 m PCF with zero dispersion wavelength at 1030 nm. When the length of PCF is 4 m, the maximum spectral bandwidth reaches 1910 nm(450~2360 nm, and the output power is 7.09 W, the optical-optical conversion efficiency reaches 58.21, and the power stability is about 0.51W. When the length of PCF is 8 m, the maximum spectral bandwidth reaches 1754 nm(446~2200 NMU, in which the 3-dB bandwidth (excluding the residual pump light and ASE light) reaches 1740 nm(460~2200 NMU, accounting for 99.20% of the total bandwidth, and the output power reaches 4.04 W. 5. By using the gain switching technique to modulate the gain of the semiconductor laser, the 1052.99 nm noise pulse seed source with the center wavelength of 1052.99 nm is obtained. The average power of the pulsed laser is amplified to 16.91 W by using a four-stage MOPA fiber amplifier. Finally, it is used to pump the 4m and 8m PCFs with zero dispersion wavelength at 1030 nm. When the repetition rate is 5 MHz, the shortest wavelength reaches 415 nm(8 m PCF, in order to further widen the spectrum in the direction of shortwave, The laser repetition rate is reduced to 2 MHz, and the supercontinuum spectrum is widened to 390 nm(4 m PCF in the shortwave direction, and the supercontinuum source prototype is assembled.
【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN248

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