超宽带高平坦度全光纤化超连续谱光源装备研制

发布时间：2018-05-08 22:08

本文选题：被动锁模光纤激光器 + 增益开关　；参考：《深圳大学》2017年硕士论文

【摘要】：超连续谱光源具有超宽带、高亮度和高空间相干性等优点,是光学相干摄影术、光谱分析、生物成像、光学相干断层成像、高精度光学频率测量和波分复用光通信系统等领域的理想光源。研究超连续谱的产生机制,不仅具有重要的学术意义,而且具有非常重要的实际应用价值。本文围绕该主题研究的内容如下:1.阐述了基于可饱和吸收体的被动锁模掺镱光纤激光器的发展概况、增益开关半导体激光器的发展概况、超连续谱光源的发展概况以及简单介绍了光子晶体光纤的特性。2.采用基于SESAM的锁模技术搭建了中心波长处在1030.28 nm、脉冲宽度达到4.6 ps的脉冲种子源,进而通过使用三级MOPA光纤放大器将脉冲激光的平均功率放大至8.62 W,最后将其用于泵浦零色散波长处在1030 nm的8 m PCF,获得了带宽为1740 nm(460~2200 nm)、输出功率为3.51 W的超连续谱光源。3.采用基于SESAM的锁模技术搭建了中心波长处在1064.32 nm、脉冲宽度达到13.6 ps的脉冲种子源,进而通过使用三级MOPA光纤放大器将脉冲激光的平均功率放大至13.50 W,最后将其用于泵浦零色散波长处在1030 nm的8 m PCF,获得了带宽为1750 nm(450~2200 nm)、输出功率为3.65 W的超连续谱光源。4.采用基于SESAM的锁模技术搭建了双波长类噪声脉冲光纤激光器,其中心波长分别为1064.15 nm和1064.98 nm。通过使用四级MOPA光纤放大器将脉冲激光的平均功率放大至17.10 W,最后将其用于泵浦零色散波长处在1030 nm的4 m和8 m PCF。当PCF的长度为4 m时,最大光谱带宽达到了1910 nm(450~2360 nm),而此时的输出功率为7.09 W,光-光转化效率达到了58.21%,功率稳定性约为0.51%。当PCF的长度为8 m时,其最大光谱带宽达到了1754 nm(446~2200 nm),其中3-dB带宽(不计剩余泵浦光及ASE光)达到了1740 nm(460~2200 nm),占全带宽的99.20%,而此时的输出功率达到了4.04 W。5.通过使用增益开关技术对半导体激光器进行增益调制,获得了中心波长为1052.99 nm类噪声脉冲种子源。通过使用四级MOPA光纤放大器将脉冲激光的平均功率放大至16.91 W,最后将其用于泵浦零色散波长处在1030 nm的4 m、5 m和8 m PCF。在重复频率为5 MHz时,其最短波长达到了415 nm(8 m PCF),为了进一步使光谱往短波方向展宽,我们将激光重复频率降低至2 MHz,最终使超连续谱在短波方向展宽至390 nm(4 m PCF),并被组装成超连续谱光源样机。
[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.
【学位授予单位】：深圳大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN248

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