共查询到19条相似文献,搜索用时 203 毫秒
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构建了可自启动的双波长运转掺铒光纤锁模激光器.通过优化增益光纤长度,利用掺铒光纤在1530nm附近的再吸收效应调节激光器的增益谱,使激光器在1530nm和1560nm附近具有相同的增益强度.实验中采用31cm掺铒光纤作为增益光纤,以透射式半导体可饱和吸收体作为锁模器件,实现了自启动双波长锁模运转.激光器锁模输出重复频率为58.01MHz,信噪比为58.2dB,最高输出功率为4.8mW.锁模输出的光谱在1532.4nm和1552.3nm处具有两个强度接近的谱峰,谱峰间距约为20nm.该激光器无需手动调节即可实现双波长运转,更便于实际使用. 相似文献
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双波长飞秒激光器量子理论研究 总被引:2,自引:0,他引:2
本文建立了一个不涉及具体光腔结构的双波长固体飞秒激光器模型,分析了群达弥散(GVD)、自相位调制(SPM)、交叉耦合、损耗调制和增益放大的动态平衡过程.从场算符的定义出发,导出了双波长飞秒激光器的量子锁模方程组,并且将该量子销模方程组化为经典锁模方程组.结果表明,该方程组和非线性薛定谔方程有着类似的结构,方程组存在稳定的脉冲解,因而从理论上证明了双波长飞秒激光器可以实现双波长同时锁模. 相似文献
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《光子学报》2021,50(7)
报道了一种基于非线性放大环形镜的"8"字形腔波长可调谐锁模掺镱光纤激光器。当泵浦功率为240 mW时,光纤激光器输出中心波长在1 064.1 nm处的耗散孤子,其光谱3 dB带宽为7.7 nm,重复频率为18.8 MHz,输出光信噪比高达71.2 dB,脉冲宽度为867 fs。分别通过调节偏振控制器和泵浦功率实现了锁模光纤激光器在1 032.8~1 065.1 nm以及1 037.4~1 041.9 nm内调谐输出。探究了不同锁模状态下的光谱与脉冲特性,获得了时间带宽积接近傅里叶变换极限的高斯型脉冲。该光纤激光器结构简单,易于调谐,稳定性好,可为实现波长调谐、耗散孤子锁模提供技术参考。 相似文献
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超宽带近红外和蓝光飞秒激光脉冲产生的实验研究 总被引:3,自引:3,他引:0
增益介质中泵浦光束提供的软光阑效应对于实现克尔透镜稳定锁模及其超宽带光谱脉冲的产生具有非常重要的作用.实验上首先对半导体泵浦全固化钛宝石飞秒激光器的锁模动态特性进行了研究,在4 W绿光泵浦状态下获得了平均输出功率为570 mW、中心波长在794 nm~835 nm范围内调谐、光谱带宽最大可达135 nm的近红外光脉冲输出,其相应的时域变换极限脉冲宽度均小于10 fs.另外,将光束聚焦在超薄BBO晶体上,获得了中心波长在418 nm~429 nm之间调谐、光谱宽带时域变换极限小于15 fs的蓝光飞秒脉冲. 相似文献
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利用化学腐蚀法在光纤包层表面成功制备了调制深度为3.9%的单壁碳纳米管饱和吸收体.组建了环形腔结构的全光纤掺铒光纤激光器,以制备的单壁碳纳米管薄膜为锁模元件,利用倏逝场锁模实现了锁模输出.锁模脉冲的中心波长为1556 nm,3 dB光谱带宽为24 nm,脉冲宽度为147 fs,重复频率为150 MHz.在520mW抽运功率下,平均输出功率为21 mW,相应的单脉冲能量为0.14 nJ. 相似文献
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报道了一种新的交叉锁模多波长钛宝石飞秒激光器的设计原理。该激光器能够同步产生两列或三列飞秒光脉冲。持续期短到25fs的双波长脉冲调谐在755-848nm之间,同步精度约10fs。 相似文献
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High-Efficiency Generation of 0.12 mJ,8.6 Fs Pulses at 400 nm Based on Spectral Broadening in Solid Thin Plates 下载免费PDF全文
《中国物理快报》2017,(7)
We demonstrate efficient generation of continuous spectrum centered at 400 nm from solid thin plates. By frequency doubling of 0.8 mJ, 30 fs Ti:sapphire laser pulses with a BBO crystal, 0.2 mJ, 33 fs laser pulses at400 nm are generated. Focusing the 400-nm pulses into 7 thin fused silica plates, we obtain 0.15 mJ continuous spectrum covering 350-450 nm. After compressing by 3 pairs of chirped mirrors, 0.12 mJ, 8.6 fs pulses are achieved.To the best of our knowledge,this is the first time that sub-10-fs pulses centered at 400 nm are generated by solid thin plates, which shows that spectral broadening in solid-state materials works not only at 800 nm but also at different wavelengths. 相似文献
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相干合成技术是超快光学领域的重要研究方向之一.当单路脉冲激光的连续谱超过一个倍频程时,精确控制其光谱相位(色散管理)是获得亚周期超短脉冲激光的关键.由于常见的脉冲压缩系统存在光谱带宽限制,因此多通道相干合成技术受到了广泛的关注.本文将充气空心光纤展宽后的超倍频程连续光谱分波段独立压缩,并利用平衡光学互相关方法锁定子脉冲之间的相位延迟,获得了4.1 fs的合成脉冲.实验结果表明相干合成技术在高能量亚周期超快光场调控中存在优势. 相似文献
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Z. Várallyay J. Fekete Á. Bányász R. Szipőcs 《Applied physics. B, Lasers and optics》2007,86(4):567-572
Compression of sub-nanojoule laser pulses using a commercially available photonic crystal fiber (PCF) with zero dispersion
wavelength of 860 nm is discussed. A twofold pulse compression starting from 24 fs transform limited seed pulses around 800 nm
is experimentally demonstrated as a verification of our simulations. Theory shows that by the optimization of input and output
chirp parameters up to the third order, high quality, 5.7 fs pulses can be generated from a cost efficient experimental setup.
Further calculations show that 1 ps pulses with central wavelength of 800 nm can be compressed down to 50 fs in the normal
dispersion regime of the fiber with proper dispersion compensation. Calculations also show that dispersion flattened fibers
can improve both the quality and the duration of compressed pulses.
PACS 42.65.Re 相似文献
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Procino I Velotta R Altucci C Amoruso S Bruzzese R Wang X Tosa V Sansone G Vozzi C Nisoli M 《Optics letters》2007,32(13):1866-1868
We demonstrate the use of a very simple, compact, and versatile method, based on the hollow-fiber compression technique, to shorten the temporal length of visible laser pulses of 100-300 fs to pulse durations shorter than approximately 50 fs. In particular, 200 fs, frequency-doubled, Nd:glass laser pulses (527 nm) were spectrally broadened to final bandwidths as large as 25 nm by nonlinear propagation through an Ar-filled hollow fiber. A compact, dispersive, prism-pair compressor was then used to produce as short as 40 fs, 150 microJ pulses. A very satisfactory agreement between numerical simulations and measurements is found. 相似文献
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Sub-20 fs visible pulses with 750 nJ energy from a 100 kHz noncollinear optical parametric amplifier
We demonstrate the operation of a 100 kHz noncollinear optical parametric amplifier that is pumped by just a few microjoules of 800 nm pulses with 50 fs duration. The device delivers sub-20 fs pulses tunable from 460 nm to beyond 1 microm and pulse energies up to 750 nJ when it is pumped with 7 microJ of energy. The design of the single-stage amplifier has been carefully optimized, and the design considerations are discussed. 相似文献
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E. Riedle M. Beutter S. Lochbrunner J. Piel S. Schenkl S. Spörlein W. Zinth 《Applied physics. B, Lasers and optics》2000,71(3):457-465
Noncollinearly phase-matched optical parametric amplifiers (NOPAs) pumped by the blue light of a frequency-doubled Ti:sapphire
regenerative amplifier are a convenient source of continuously tunable ultrashort pulses in the visible and near infrared
for spectroscopic experiments. We present the underlying principles, report recent improvements and describe the experiences
gained from the routine use of a number of NOPAs in our laboratories. We find that the setup can easily be optimized for the
given experimental requirements. Typical output-pulse energies in the visible are 5 to 10 μJ and a few μJ in the NIR from
200 μJ regenerative-amplifier pulses at 800 nm. From 460 to 700 nm, pulse lengths between 10 and 20 fs are routinely achieved,
while the length increases monotonically from about 20 fs at 900 nm to just below 50 fs at 1600 nm. In all cases this corresponds
to a dramatic shortening compared to the length of the pump pulses of around 100 fs. First results show that the 700 to 900 nm
region can be accessed with sub-50-fs pulse lengths by use of an intermediate white-light generator in a two-stage setup.
Received: 29 November 1999 / Published online: 5 July 2000 相似文献
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B. Kibler R. Fischer G. Genty D.N. Neshev J.M. Dudley 《Applied physics. B, Lasers and optics》2008,91(2):349-352
Experiments and numerical simulations are used to study non-phasematched single-mode third harmonic generation occurring simultaneously
with fs pulse spectral broadening in highly nonlinear fibre. Pump pulses around 100 fs at 1560 nm injected into sub-5 cm lengths
of commercially-available highly nonlinear fibre are observed to undergo spectral broadening spanning over 700 nm at the -30 dB
level, and to simultaneously generate third harmonic radiation around 520 nm. Simulations based on a generalized nonlinear
envelope equation are shown to well reproduce the spectral structure of the broadened pump pulses and the generated third
harmonic signal.
PACS 42.65.-k; 42.81.Dp 相似文献
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McWilliam A Lagatsky AA Brown CT Sibbett W Zhukov AE Ustinov VM Vasil'ev AP Rafailov EU 《Optics letters》2006,31(10):1444-1446
A quantum-dot-based saturable absorber has been demonstrated to initiate the generation of femtosecond pulses from a passively mode-locked solid-state laser. Control and tuning of the pulse duration from 58 ps to 158 fs was achieved. The 158 fs transform-limited pulses at 1280 nm are the shortest pulses that were produced from the Cr:forsterite laser passively mode locked by an InAs/InGaAs quantum-dot semiconductor saturable absorber mirror. 相似文献