Yishan Wang

State Key Laboratory Of Transient Optics And Photonics, Ch’ang-an, Shaanxi, China

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Publications (91)165.33 Total impact

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    ABSTRACT: We demonstrate an all polarization-maintaining (PM) fiber-based optical frequency comb and provide the detailed environmental stability analysis results. The frequency comb has been built by commercial available PM fiber completely, and its static uncertainty in optical domain is 350 Hz in 1 s when referenced to a low noise oven controlled crystal oscillator. The acoustic resonant frequencies of the system have been measured. It is proved that acoustic-vibration induced phase noise could be eliminated by low pass vibration-isolation structure. Further, the existence of the optimum working temperature is illustrated. At this temperature (289.6 K), the out-loop integrated phase noise of f<sub>r</sub> and the temperature-drift induced instability of f<sub>CEO</sub> reach the lowest level 31.6 μrad and 0 kHz/(mW∙K) respectively. Finally, the system is proved to be stable under different humidity (18% ~80%) by a 240-day-long record of the f<sub>CEO</sub>.
    Optics Express 06/2015; 23(13):17549-17559. · 3.53 Impact Factor
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    ABSTRACT: We experimentally demonstrate an all-fiber single-polarization dual-wavelength Yb-doped fiber laser passively mode-locked with a 45°-tilted fiber grating for the first time. Stable dual-wavelength operation exhibits double-rectangular spectral profile centered at 1033 and 1053 nm, respectively. The 3 dB bandwidth of each rectangular optical spectrum is estimated as 10 nm. The separation of two fundamental repetition rates is 6 kHz. By employing the 45° TFG with the polarization-dependent loss of 33 dB, output pulses with 27 dB polarization extinction ratio are implemented in the experiment. The single pulse centered at 1053 nm is researched by using a filter at the output port of the laser, and the experimental results denote that the output ps pulses are highly chirped. The formation mechanism of dual-wavelength operation is investigated.
    Laser Physics Letters 06/2015; 12(6):065102. DOI:10.1088/1612-2011/12/6/065102 · 2.96 Impact Factor
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    ABSTRACT: We report a refractive index (RI) and liquid level sensing system based on a hybrid grating structure comprising of a 45° and an 81° tilted fiber gratings (TFGs) that have been inscribed into a single mode fiber in series. In this structure, the 45°-TFG is used as a polarizer to filter out the transverse electric (TE) component and enable the 81°-TFG operating at single polarization for RI and level sensing. The experiment results show a lower temperature cross-sensitivity, only about 7.33 pm/°C, and a higher RI sensitivity, being around 180 nm/RIU at RI=1.345 and 926 nm/RIU at RI=1.412 region, which are significantly improved in comparison with long period fiber gratings. The hybrid grating structure has also been applied as a liquid level sensor, showing 3.06 dB/mm linear peak ratio sensitivity.
    Optics Communications 04/2015; 351. DOI:10.1016/j.optcom.2015.04.038 · 1.54 Impact Factor
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    ABSTRACT: A spectro-temporal filtering method is proposed to increase the contrast ratio of chirped pulses. The advantages of this method include easy cascading, high transmission, and it can also be used in the high-energy chirped pulse amplifier (CPA) system. The effectiveness of the proposed method was experimentally verified by operating the spectro-temporal filtering method on a Ti:sapphire CPA system and then measuring the contrast ratio of pulse based on optical Kerr gate effect(OKG). The measuring result demonstrated that, after passing through one-stage spectro-temporal filtering system with transmittance up to 70%, the contrast ratio of the pulse was improved by an order of magnitude.
    Journal of Modern Optics 01/2015; 62(7):1-5. DOI:10.1080/09500340.2014.994682 · 1.17 Impact Factor
  • Journal of Lightwave Technology 01/2015; DOI:10.1109/JLT.2015.2422076 · 2.86 Impact Factor
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    ABSTRACT: A direct-current-driven plasma jet is developed by applying a longitudinal electric field on the flowing argon at ambient air. This plasma shows a torch shape with its cross-section increased from the anode to the cathode. Comparison with its counterparts indicates that the gas flow plays a key role in variation of the plasma structure and contributes much to enlarging the plasma volume. It is also found that the circular hollow metal base promotes generation of plasma with a high-power volume density in a limited space. The optical emission spectroscopy (OES) diagnosis indicates that the plasma comprises many reactive species, such as OH, O, excited N2, and Ar metastables. Examination of the rotational and vibrational temperature indicates that the plasma is under nonequilibrium condition and the excited species OH(A 2Σ+), O(5P), and N2(C 3Πu) are partly generated by energy transfer from argon metastables. The spatially resolved OES of plasma reveals that the negative glow, Faraday dark space, and positive column are distributed across the gas gap. The absence of the anode glow is attributed to the fact that many electrons in the vicinity of the anode follow ions into the positive column due to the ambipolar diffusion in the flowing gas.
    Scientific Reports 09/2014; 4:6323. DOI:10.1038/srep06323 · 5.58 Impact Factor
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    Wei Zhao, Xiaohong Hu, Yishan Wang
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    ABSTRACT: Three kinds of pulse amplification techniques including chirped-pulse amplification (CPA), parabolic pulse amplification, and divided-pulse amplification (DPA) based on rare-earth doped fiber gain medium are reviewed. Large core area fiber and cladding-pumping technique compose the foundation of high average power, high pulse energy fiber CPA technology. Femtosecond pulses have been demonstrated at average powers of up to 830 W, pulse energies of up to 2.2 mJ and compressed pulse duration of 23 fs from different fiber CPA systems. The state-of-the-art performance of fiber CPA system to date is the simultaneous generation of 530 W, 1.3 mJ compressed femtosecond pulses at 400 kHz repetition rate. The balance between fiber gain, dispersion and nonlinearity is required for the self-similar propagation and thus the formation of pulses with parabolic intensity profile. Sub-33 fs pulses were demonstrated from a gain-cascaded parabolic amplification system. A newly emerging DPA technique is also reviewed. In addition, the applications of pulsed fiber amplifiers in the areas of supercontinuum generation and material micromachining system are also introduced.
    IEEE Journal of Selected Topics in Quantum Electronics 09/2014; 20(5):1-13. DOI:10.1109/JSTQE.2014.2308396 · 3.47 Impact Factor
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    ABSTRACT: In this paper, pulse contrast was measured for femtosecond lasers with low-repetition-rate (40 Hz) using optical Kerr gate as a sampler. The results show that, without attenuator, dynamic range as high as 104 was achieved, with a scanning range of 126 ps and a temporal sampling interval of 6.3 fs. Moreover, the method suits for measuring laser pulse contrast in wide spectrum range.
    Journal of Nonlinear Optical Physics & Materials 09/2014; 23(03):1450031. DOI:10.1142/S0218863514500313 · 0.48 Impact Factor
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    ABSTRACT: We study a single-wall carbon nanotube (SWNT) Polyvinyl alcohol (PVA) composite as a saturable absorber (SA) for pulse generation in Yb-doped fiber lasers. The saturable absorption and optical limiting (OL) characteristics of the SWNT device are investigated. By combing these two nonlinear effects, we find out for the first time, to the best of our knowledge, that mode-locking can be obtained in the dissipative soliton regime at low pumping followed by Q-switching at high pumping, which is quite different from conventional pulse dynamic evolutions. The Q-switched state operating at higher pump powers is due to the OL effect. The inverted operating fiber laser can be applied in various potential applications such as versatile material processing, optical communication and radar system etc.
    Optics Express 07/2014; 22(14). DOI:10.1364/OE.22.017227 · 3.53 Impact Factor
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    ABSTRACT: Phase noise is very important for the ultrafast pulse application in telecommunication, ultrafast diagnose, material science, and biology. In this paper, two types of carbon nano-materials, single-wall carbon nanotube and graphene oxide, are investigated for noise suppression in ultrafast photonics. Various properties of the wall-paper SAs, such as saturable intensity, optical absorption and degree of purity, are found to be key factors determining the phase noise of the ultrafast pulses. A reduced-noise femtosecond fiber laser is experimentally demonstrated by optimizing the above parameters of carbon material based SAs. The phase noise reduction more than 10 dB at 10 kHz can be obtained in the experiments. To our knowledge, this is the first time that the relationship between different carbon material based SAs and the phase noise of mode-locked lasers has been investigated. This work will pave the way to get a high-quality ultrashort pulse in passively mode-locked fiber lasers.
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    ABSTRACT: Carbon nanotubes in heavy water (deuteroxide, D2O) dispersion was fabricated and used as absorber in Q-switched Nd:YVO4 laser for the first time to the best of our knowledge. Such liquid absorber has the virtues of good optical transparency, high heat dissipation and non contact damage. The shortest pulse width of the Q-switched laser is 709 ns, corresponding to 80 kHz repetition rate. The maximum output power of passively Q-switched laser is 214 mW.
    Optics Communications 06/2014; 321:172–175. DOI:10.1016/j.optcom.2014.01.067 · 1.54 Impact Factor
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    Xiaohui Li, Yishan Wang, Wei Zhang, Wei Zhao
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    ABSTRACT: We have observed soliton molecules with variable modulation depth of spectra in a passively mode-locked dispersion-managed Yb-doped fiber laser. The soliton molecule we experimentally investigated presents diatomic and tetratomic types. With the enhancement of pump power, the laser alternately operates at solitons molecule, temporal-separation-oscillation solitons, and harmonic mode-locked states. Moreover, the phase of solitons molecule is only locked at low pump, and excess pump would cause phase vibration.
    Laser Physics Letters 05/2014; 11(7):075103. DOI:10.1088/1612-2011/11/7/075103 · 2.96 Impact Factor
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    ABSTRACT: Liquid saturable absorbers have some advantages in some aspects over solid saturable absorbers. In this paper, graphene oxide in heavy water (deuteroxide, D2O) dispersion was fabricated and used as absorber in Q-switched Nd:YAG laser for the first time, to the best of our knowledge. The shortest pulse width of the Q-switched laser is 523 ns, corresponding to a repetition rate of 92.9 kHz. The maximum peak power of Q-switched pulse is 6.6 W. Such a liquid absorber has the virtues of good optical transparency, high heat dissipation, and no contact damage.
    IEEE Photonics Journal 04/2014; 6(2):1-6. DOI:10.1109/JPHOT.2014.2309631 · 2.33 Impact Factor
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    ABSTRACT: A diode-pumped passively Q-switched Nd:GGG laser with a single-walled carbon nanotube as saturable absorber has been realized. A maximum average output power of 1.24 W and a minimum pulse duration of 49.8 ns were obtained at the incident pump power of 7.69 W. Corresponding to a maximum single pulse energy and a highest peak power were 4.3 \(\upmu \hbox {J}\) and 85 W, respectively. The pulse repetition rates varied from 62 to 292 kHz versus the increase of the incident pump power.
    Optical and Quantum Electronics 03/2014; 47(3). DOI:10.1007/s11082-014-9945-8 · 1.08 Impact Factor
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    ABSTRACT: A diode-end-pumped passively Q-switched Nd:GGG laser with a double-walled carbon nanotube (DWCNT) saturable absorber is demonstrated for the first time. A maximum output power of 1.03 W and a minimum pulse duration of 24.3 ns with a highest peak power of 121 W were obtained. The pulse repetition rate varied from 122 to 350 kHz as the pump power increased. The experimental results show that DWCNT is an excellent saturable absorber for passive Q-switched lasers.
    Laser Physics Letters 02/2014; 11(3). DOI:10.1088/1612-2011/11/3/035001 · 2.96 Impact Factor
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    ABSTRACT: The demonstration is reported of a diode-pumped passively Q-switched Nd:LuVO4 laser at 1064 nm using a transmission-type graphene oxide as the saturable absorber. The graphene oxide saturable absorber with a modulation depth of 10% was fabricated using a vertical evaporation method. With a pump of 11.5 W, a maximum output power of 1.353 W was obtained with 186-ns pulse duration and 336.7-kHz repetition rate, corresponding to a maximum pulse energy of 4 μJ per pulse.
    Journal of Modern Optics 01/2014; 61(3). DOI:10.1080/09500340.2013.879935 · 1.17 Impact Factor
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    ABSTRACT: A magnetic field is introduced to the dielectric-barrier discharge enhanced direct-current glow discharge for efficient plasma generation, with the discharge power of 2.7 W and total energy consumption reduced to 34% of the original. By spatially examining the emission spectra and plasma temperature, it is found that their peaks shift from edges to the center and the negative and anode glows merge into the positive column and disappear, accompanied by improvement of uniformity and chemical activity of the enlarged plasma. This lies in the enhancement of ionization in the curved and lengthened electron path and the dispersion of discharge domains.
    Applied Physics Letters 12/2013; 104(1). DOI:10.1063/1.4861162 · 3.52 Impact Factor
  • Optical Engineering 10/2013; 52(10):106107. DOI:10.1117/1.OE.52.10.106107 · 0.96 Impact Factor
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    ABSTRACT: We have demonstrated a diode-side-pumped Q-switched Nd:YAG laser operating at 1319nm with a saturable absorber of graphene oxide fabricated by the vertical evaporation method. The 1319nm Q-switched laser pulses were realized with average output power of 820 mW, pulse width of 2s and repetition rate of 35kHz. The pulse energy and peak power were 23.4J and 11.7W, respectively when the optical pump power was 232W. The experimental results indicate that graphene oxide is an effective saturable absorber for Q-switched lasers.
    Journal of Modern Optics 09/2013; 60(15):1287-1289. DOI:10.1080/09500340.2013.837975 · 1.17 Impact Factor
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    ABSTRACT: The formation and evolution of bound dissipative pulses in the all-normal dispersion Yb-fiber laser based on a novel 45° tilted fiber grating (TFG) are first investigated both numerically and experimentally. Based on the nonlinear polarization rotation technique, the TFG and two polarization controllers (PCs) are exploited for stable self-started passive mode locking. Numerical results show that the formation of bound-state pulses in the all-normal dispersion region is the progress of soliton shaping through the dispersive waves and follows the soliton energy quantization effect. Theoretical and experimental results demonstrate that the formation mechanism of bound-state pulses can be attributed to the high pump strength and effective filter bandwidth. The obtained bound-state dissipative pulses with quasi-rectangular spectral profile have fixed pulse separation as a function of pump power.
    Laser Physics Letters 08/2013; 10(9):095103. DOI:10.1088/1612-2011/10/9/095103 · 2.96 Impact Factor

Publication Stats

339 Citations
165.33 Total Impact Points

Institutions

  • 1999–2015
    • State Key Laboratory Of Transient Optics And Photonics
      Ch’ang-an, Shaanxi, China
  • 2014
    • Shenzhen University
      • College of Optoelectronic Engineering
      Bao'an, Guangdong, China
  • 2000–2014
    • Chinese Academy of Sciences
      • State Key Laboratory of Transient Optics and Photonics
      Peping, Beijing, China
  • 2013
    • Yulin Normal University
      Watlam, Guangxi Zhuangzu Zizhiqu, China