新型光纤激光器的实验研究
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摘要
自从世界上第一台光纤激光器出现以后,光纤激光器便以其特有的优点引起广泛的关注和研究,随之光纤激光器也迅速发展起来。近年来光通信、光纤分布式拉曼温度传感及人眼安全波段的激光空间传感等迅速发展对高功率光纤激光器有着迫切需求。本文的主要工作围绕着高功率的单频和调Q光纤激光器展开了研究,获得了丰硕的成果。
本论文主要的研究成果有:
1.用傅里叶变换的方法对锁模激光器模式间的位相和振幅涨落对锁模脉冲列特性的影响进行了分析。将锁模激光器中各模式的位相和振幅涨落作傅里叶展开,再通过增益谱抽样的傅里叶变化得到其时域行为。分析结果表明振幅的系统涨落及随机涨落均不引起脉宽的明显变化,只引起脉冲间背景的加大,但位相的随机涨落会使脉冲列强度产生波动。所用物理图像简明,结果对锁模脉激光器实验研究有参考意义。
2.研制成功DFB自注入锁定环腔光纤激光器,利用DFB激光器作为种籽源实现自注入锁定,同时利用掺铒光纤的SHB效应有效地压窄了作为种籽源的DFB光纤激光器线宽,获得了功率为116mW,线宽小于2kHz的单频光纤激光器。激光器稳定性很好,并且具有进一步提高输出功率的潜力。
3.研究了掺铒光纤作为可饱和吸收体的被动调Q光纤激光器的输出特性,利用环腔结构获得了信噪比＞80dB,中心波长稳定,峰值功率＞0.2W,脉宽＜4us的调Q激光输出。此调Q激光器成本低廉,结构紧凑,输出稳定。
4.研究了环形腔掺铒光纤激光器的在增益调开关下的输出特性,获得了脉宽可调,重复频率可调的脉冲输出,输出峰值功率＞0.3W,脉宽小于1us。研究了光纤DFB激光器增益开关特性,获得脉宽＜200ns的脉冲输出。
5.研究了基于光纤中RS-SBS效应的被动调Q光纤激光器,对腔结构做了重要改进,通过内置起偏器和偏振控制器,降低了激光器的阈值,在1.5um和1um波段分别获得了脉宽＜20ns和＜2ns的脉冲输出,峰值功率200W-400W。研究了在1.5um波段的受激布里渊被动锁模光纤激光器输出特性。
本论文创新点有:
1.提出利用小功率的光纤DFB激光器做种籽源,在掺铒光纤内诱发空间烧孔,通过环路放大结构实现自注入锁定的方案,同时实现了窄线宽和大功率的单频激光输出,线宽＜2kHz,功率为116mW。
2.首次研究了光纤DFB激光器的在增益开关下的输出特性,所获得的脉冲峰值功率远高于激光器在稳衡条件下工作时的功率,输出脉宽＜200ns。
3.在现有RS-SBS被动调Q激光器的基础上,通过加入起偏器及偏振控制器,极大的降低了这种激光器的阈值,在很低的泵浦水平下获得了脉宽＜12ns,峰值功率200W～400W的调Q脉冲输出。
Since the first fiber laser appeared in the world, it has attracted broad focus and research for its unique advantages, followed by its rapid development. In recent years, with the development of optical communication, laser weapon, Distributed Fiber Raman Photon Temperature Sensor and space sensing with laser wavelength at the human eye's safe band, it has caused urgent demand for appropriate high-power light source. The research of this thesis concerns mostly high-power single-frequency and Q-switched fiber laser.
The major results in the dissertation are obtained as the following:
1. Use Fourier transform method to analyse the influence of modal amplitude and phase fluctuations in a mode-locked laser on performance of its output pulse. Results show that the pulse shape and the bandwidth remain essentially constant when the modes have amplitude and phase fluctuations, but appear superimposed on a fluctuations background. The phase variations will cause the fluctuation of peak. The physical picture in this paper is concise and is helpful to get stable mode-locked laser output in experiments.
2. The invention of DFB self-injection ring cavity fiber laser is successfully made, in which DFB laser is used as the seed source to achieve self-injection and the SHB effect of erbium doped fiber taken to narrow the linewidth of light from the DFB fiber laser. Finally we gained a single-frequency fiber laser with power of 116mW and linewidth of less than 2kHz. The laser works very stably with the potential of further boosting the output power.
3. The characteristics of the output of passively Q-switched fiber laser with erbium doped fiber as the saturable absorber is investigated. We have obtained Q-switched laser output with stable center wavelength which has peak power of more than 0.2W, pulse width of less than 4us and SNR of more than 80 dB by using the ring cavity configuration. This Q-switched fiber laser has several good qualities such as low cost, compact configuration and stable output.
4. The characteristics of the output of gain switching ring cavity erbium doped fiber is investigated. We gained pulse width and repetition frequency tunable output with peak power of more than 0.3W and pulse width of less than 1us. We also carried out some research about the characteristics of the gain guiding of DFB fiber laser and gained the pulse output with pulse width of less than 200ns. This kind of fiber laser has huge potential in future application.
5. Self-Q-switched fiber lasers with Rayleigh-SBS ring mirrors is investigated. Through adding polarizer and polarization controller to reduce the threshold of the laser, we gained pulse output with peak power of 200W-400W and pulse width of less than 20ns in the band of 1.5 um and 2ns in the band of 1um. We also did some research about the output characteristics of SBS passively mode-locked fiber laser in the band of 1.5um.
The innovative results in this dissertation are as following:
1. By using low-power DFB fiber laser as the seed source to induce spatial hole burning in erbium doped fiber and the ring cavity configuration to achieve self-injection, we gained narrow linewidth and high power single-frequency laser output with linewidth of less than 2kHz and power of more than 120mW.
2. We investigated for the first time the output characteristics of DFB fiber laser under gain switching and the peak power of the pulse. We gained the pulse width of less than 200ns, the pulse power is far above the output power of the laser under stable conditions.
3. Through adding polarizer and polarization controller in traditional RS-SBS passively Q-switched fiber laser to reduce the threshold of the laser, we gained Q-switched pulse output with pulse width of less than 12ns and power of 200W-400W under low pump level.
本论文主要的研究成果有:
1.用傅里叶变换的方法对锁模激光器模式间的位相和振幅涨落对锁模脉冲列特性的影响进行了分析。将锁模激光器中各模式的位相和振幅涨落作傅里叶展开,再通过增益谱抽样的傅里叶变化得到其时域行为。分析结果表明振幅的系统涨落及随机涨落均不引起脉宽的明显变化,只引起脉冲间背景的加大,但位相的随机涨落会使脉冲列强度产生波动。所用物理图像简明,结果对锁模脉激光器实验研究有参考意义。
2.研制成功DFB自注入锁定环腔光纤激光器,利用DFB激光器作为种籽源实现自注入锁定,同时利用掺铒光纤的SHB效应有效地压窄了作为种籽源的DFB光纤激光器线宽,获得了功率为116mW,线宽小于2kHz的单频光纤激光器。激光器稳定性很好,并且具有进一步提高输出功率的潜力。
3.研究了掺铒光纤作为可饱和吸收体的被动调Q光纤激光器的输出特性,利用环腔结构获得了信噪比＞80dB,中心波长稳定,峰值功率＞0.2W,脉宽＜4us的调Q激光输出。此调Q激光器成本低廉,结构紧凑,输出稳定。
4.研究了环形腔掺铒光纤激光器的在增益调开关下的输出特性,获得了脉宽可调,重复频率可调的脉冲输出,输出峰值功率＞0.3W,脉宽小于1us。研究了光纤DFB激光器增益开关特性,获得脉宽＜200ns的脉冲输出。
5.研究了基于光纤中RS-SBS效应的被动调Q光纤激光器,对腔结构做了重要改进,通过内置起偏器和偏振控制器,降低了激光器的阈值,在1.5um和1um波段分别获得了脉宽＜20ns和＜2ns的脉冲输出,峰值功率200W-400W。研究了在1.5um波段的受激布里渊被动锁模光纤激光器输出特性。
本论文创新点有:
1.提出利用小功率的光纤DFB激光器做种籽源,在掺铒光纤内诱发空间烧孔,通过环路放大结构实现自注入锁定的方案,同时实现了窄线宽和大功率的单频激光输出,线宽＜2kHz,功率为116mW。
2.首次研究了光纤DFB激光器的在增益开关下的输出特性,所获得的脉冲峰值功率远高于激光器在稳衡条件下工作时的功率,输出脉宽＜200ns。
3.在现有RS-SBS被动调Q激光器的基础上,通过加入起偏器及偏振控制器,极大的降低了这种激光器的阈值,在很低的泵浦水平下获得了脉宽＜12ns,峰值功率200W～400W的调Q脉冲输出。
Since the first fiber laser appeared in the world, it has attracted broad focus and research for its unique advantages, followed by its rapid development. In recent years, with the development of optical communication, laser weapon, Distributed Fiber Raman Photon Temperature Sensor and space sensing with laser wavelength at the human eye's safe band, it has caused urgent demand for appropriate high-power light source. The research of this thesis concerns mostly high-power single-frequency and Q-switched fiber laser.
The major results in the dissertation are obtained as the following:
1. Use Fourier transform method to analyse the influence of modal amplitude and phase fluctuations in a mode-locked laser on performance of its output pulse. Results show that the pulse shape and the bandwidth remain essentially constant when the modes have amplitude and phase fluctuations, but appear superimposed on a fluctuations background. The phase variations will cause the fluctuation of peak. The physical picture in this paper is concise and is helpful to get stable mode-locked laser output in experiments.
2. The invention of DFB self-injection ring cavity fiber laser is successfully made, in which DFB laser is used as the seed source to achieve self-injection and the SHB effect of erbium doped fiber taken to narrow the linewidth of light from the DFB fiber laser. Finally we gained a single-frequency fiber laser with power of 116mW and linewidth of less than 2kHz. The laser works very stably with the potential of further boosting the output power.
3. The characteristics of the output of passively Q-switched fiber laser with erbium doped fiber as the saturable absorber is investigated. We have obtained Q-switched laser output with stable center wavelength which has peak power of more than 0.2W, pulse width of less than 4us and SNR of more than 80 dB by using the ring cavity configuration. This Q-switched fiber laser has several good qualities such as low cost, compact configuration and stable output.
4. The characteristics of the output of gain switching ring cavity erbium doped fiber is investigated. We gained pulse width and repetition frequency tunable output with peak power of more than 0.3W and pulse width of less than 1us. We also carried out some research about the characteristics of the gain guiding of DFB fiber laser and gained the pulse output with pulse width of less than 200ns. This kind of fiber laser has huge potential in future application.
5. Self-Q-switched fiber lasers with Rayleigh-SBS ring mirrors is investigated. Through adding polarizer and polarization controller to reduce the threshold of the laser, we gained pulse output with peak power of 200W-400W and pulse width of less than 20ns in the band of 1.5 um and 2ns in the band of 1um. We also did some research about the output characteristics of SBS passively mode-locked fiber laser in the band of 1.5um.
The innovative results in this dissertation are as following:
1. By using low-power DFB fiber laser as the seed source to induce spatial hole burning in erbium doped fiber and the ring cavity configuration to achieve self-injection, we gained narrow linewidth and high power single-frequency laser output with linewidth of less than 2kHz and power of more than 120mW.
2. We investigated for the first time the output characteristics of DFB fiber laser under gain switching and the peak power of the pulse. We gained the pulse width of less than 200ns, the pulse power is far above the output power of the laser under stable conditions.
3. Through adding polarizer and polarization controller in traditional RS-SBS passively Q-switched fiber laser to reduce the threshold of the laser, we gained Q-switched pulse output with pulse width of less than 12ns and power of 200W-400W under low pump level.
引文
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