Zhiyi Wei

Zhiyi Wei
Chinese Academy of Sciences | CAS · Institute of Physics

About

556
Publications
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6,008
Citations

Publications

Publications (556)
Article
We experimentally investigated the optimized phase matching condition for high order harmonic generation as a source of time-resolved Angle-resolved photoemission spectroscopy (TR-ARPES) applications. In the loose focusing scheme, we find that the divergence of harmonics decreases with the increase of gas cell length, while the maximum intensity is...
Article
In this work, we used nanocomposite Saturable absorbers (SAs) in order to precisely design and modulate the process of compositing the light absorption by band gap engineering. Due to the higher absorption intensity of our MoS2/MXene nanocomposite, we have successfully shortened the pulse duration (1.2 μs) of SA with enhancing saturable absorption...
Article
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Continuous wave (CW) laser at a vacuum ultraviolet (VUV) range with the narrow-linewidth is an ideal optical source in angle-resolved photoemission spectroscopy (ARPES) for the research of superconductors with a narrow band gap. In this study, we present an eighth-harmonic-generation (EHG) laser scheme for CW laser generation at the VUV range, in p...
Article
Delay-controlled two-color, few-cycle pulses are powerful tools for ultrafast nonlinear optics. In this Letter, 35-fs, 800 nm pulses were injected into a noble-gas-filled hollow-core fiber to obtain over-octave spectra (450–1000 nm) and were divided into two parts for dispersion management by a Mach–Zehnder–type interferometer. Two few-cycle pulses...
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We demonstrate an all-fiber scheme for generating supercontinuum spectrum based on a combination method. The configuration employed a nonlinear photonic crystal fiber for dispersion pre-management, an Yb-doped gain fiber for amplification and a special tapered photonic crystal fiber for supercontinuum generation. This setup allows for the generatio...
Article
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Supercontinuum generation has been widely applied in laser spectroscopy and few-cycle pulse generation. It is composed of complex and unmeasurable nonlinear optical effects, which influence the final broadened spectrum markedly. To describe and characterize the two key processes, the Kerr effect and ionization, we employ two nonlinear integrals, in...
Article
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Ultrafast laser oscillators are indispensable tools for diverse applications in scientific research and industry. When the phases of the longitudinal laser cavity modes are locked, pulses as short as a few femtoseconds can be generated. As most high-power oscillators are based on narrow-bandwidth materials, the achievable duration for high-power ou...
Article
In this paper, we utilized the ternary Mo(1-x)WxS2 alloys to fabricate Mo0.5W0.5S2 film, which serve as a ultrashort pulse mode-locker in erbium-doped all fiber lasers (EDFL). The modulation depth, saturable intensity and unsaturated loss of the film SA were 12%, 4.5 MW/cm² and 67.1% respectively. Stable self-mode-locking pulses could be achieved w...
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We report a broadly tunable mid-infrared femtosecond KTiOPO4 optical parametric oscillator (OPO) pumped by a mode-locked Yb:KGW oscillator. Under pump power of 7 W, up to 2.05 W average power was generated in the 1.41–1.71 μm region at a repetition rate of 151 MHz, corresponding to a pump-to-signal conversion efficiency of 29.3%. After compensating...
Article
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Q-switched lasers have occupied important roles in industrial applications such as laser marking, engraving, welding, and cutting due to their advantages in high pulse energy. Here, SnS2-based Q-switched lasers are implemented. Considering that SnS2 inherits the thickness sensitive optical characteristics of TMD, three kinds of SnS2 with different...
Article
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Annular-shaped femtosecond few-cycle pulses are generated by 40fs laser pulses propagating through 6 solid thin plates in numerical simulations as well as in experiments. The generation of such pulses takes advantage of the conical emission caused by plasma effect, which introduces continuously varying off-axis plasma density along the radial direc...
Article
Yttrium oxide (Y2O3) has garnered some attention in view of its potential to be integrated into a wide range of high-strength structural components, microelectronic and optoelectronic devices. However, the nonlinear optical research of this promising material has not been implemented yet. In this paper, not only the electronic band structures of Y2...
Article
Full-text available
Ti:sapphire laser has an important position in ultrashort pulse generation and wavelength tuning. The use of expensive frequency‐doubled diode‐pumped solid‐state laser as the pump source limits the promotion of its application to a certain extent. With the maturity of high‐power blue‐green laser diodes (LDs), low‐cost LD directly pumped Ti:sapphire...
Article
Ultrabroadband generation of white-light continuum spanning from ultraviolet to near-infrared (375–920 nm) is demonstrated by using induced-phase modulation between two-color femtosecond pulses in multiple thin plates. The fundamental wave and its second-harmonic wave from one Ti:sapphire chirped-pulse amplifier are injected into nine 100 μm-thick...
Article
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We demonstrate, to the best of our knowledge, the first double-pass pre-chirp managed fiber amplifier. The double-pass fiber amplifier exhibits high gain allowing us to amplify chirped picosecond pulses from 20 mW to 113 W in a rod-type Yb-fiber corresponding to 38 dB gain. We study the dependence of static mode degradation (SMD) on the nonlinear p...
Article
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The device of multi-pass-cell (MPC) could broaden the spectra of ultrafast laser pulses based on the self-phase-modulation (SPM) effect, which is composed of two concave mirrors and nonlinear mediums. In this paper, the pulse duration of 172 fs is compressed from a 11.3 ps Nd: YVO4 regenerative amplifier at the repetition rate of 1 kHz by using two...
Article
With the rapid development of laser technology, the vision of attosecond world has been unfolded. Since the first isolated attosecond pulses produced by high-order harmonic generation in 2001, the time-resolved spectroscopy has entered the attosecond domain and greatly strengthened our understanding of ultrafast electron dynamics in atoms, molecule...
Article
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We reported a high-power pure Kerr-lens mode-locked Yb:CALYO laser based on the dual-confocal cavity delivering sub-100-fs pulses. The output pulses at 81 MHz have an average power of 10.4 W and the pulse duration of 98 fs, corresponding to the peak power of 1.14 MW. This is, to the best of our knowledge, the highest average power ever reported for...
Article
We report a high power fiber amplifier based on nonlinear chirped-pulse amplification (NCPA). To manage the nonlinearity, pulse shaping is introduced by self-phase modulation in the fiber stretcher with the help of spectral filtering. The third-order dispersion is compensated for by the nonlinear phase shift in the NCPA. With optimization, the syst...
Article
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We demonstrate a diode-pumped femtosecond Yb:CaGdAlO 4 (Yb:CALGO) laser with a semiconductor saturable absorber mirror (SESAM) for stable mode-locking operation. A perfect beam profile is measured under 10 W output power with $M_{x}^{2}$ = 1.017 and $M_{y}^{2}$ = 1.016 in the horizontal and vertical directions, respectively. At the repetition rate...
Article
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We report a fully stabilized self-referenced all-solid-state-laser frequency comb based on a home-built Kerr-lens mode-locked Yb:CaYAlO4 oscillator, which delivers ultrafast pulses with a pulse duration of 54 fs and an average power of 1.5 W. Free running carrier-envelope phase offset frequency (fceo) is observed with a signal to noise ratio of 40...
Article
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We incorporate two techniques into pre-chirp managed amplification (PCMA) to achieve high-energy ultrashort pulses with the duration well below 100 fs. Numerical simulations confirmed by our experimental results demonstrate that seeding PCMA with circularly polarized pulses instead of linearly polarized pulses can increase the amplified pulse energ...
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Due to the unique properties of two-dimensional (2D) materials, much attention has been paid to the exploration and application of 2D materials. In this review, we focus on the application of 2D materials in mode-locked fiber lasers. We summarize the synthesis methods for 2D materials, fiber integration with 2D materials and 2D materials based satu...
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IV–VI semiconductors have attracted widespread attention in basic research and practical applications, because of their electrical and optoelectronic properties comparable to graphene. Herein, an optical modulator based on SnSSe with strong nonlinearity is prepared by chemical vapor transfer method. The modulation depth of proposed SnSSe saturable...
Article
In article number 1901631 by Ming Lei, Zhongming Wei and co‐workers, the application of typical 2D materials in fiber lasers is presented in detail, and the effect of layer regulation on the lasers is highlighted. Selected 2D materials have been applied, as displayed on the cover in chronological order on a time axis. The interactions between light...
Article
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In recent years, the diversity of transition metal dichalcogenides (TMDs) has made them occupy the essential status in the exploration of saturable absorbing materials. WTe 2 , also an important member of TMDs not only exhibits narrower band gap than MoS 2 or WS 2 , but also has fast relaxation time, thus it has advantages in the realization of bro...
Article
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Yttrium oxide (Y 2 O 3 ) has been widely used in metal-reinforced composites, microelectronics, waveguide lasers, and high-temperature protective coatings because of its good physical and photoelectric properties. However, few studies have been done on the nonlinear optical applications of Y 2 O 3 as saturable absorbers (SAs) in fiber lasers so far...
Article
The explosive success of graphene opens a new era of ultrathin 2D materials. It has been realized that the van der Waals layered materials with atomic and less atomic thickness can not only exist stably, but also exhibit unique and technically useful properties including small size effect, surface effect, macro quantum tunnel effect, and quantum ef...
Article
Titanium trisulfide (TiS3) is regarded as a candidate material for optoelectronic devices and nano-transistors due to its photoresponse. However, its nonlinear optical response in a mode-locked laser is yet to be investigated. Here, the performance of TiS3 as a saturable absorber in a mode-locked laser is demonstrated. The generated mode-locked pul...
Article
Full-text available
The exploration of promising nonlinear optical materials, which allows for the construction of high-performance optical devices in fundamental and industrial applications, has become one of the fastest-evolving research interests in recent decades and plays a key role in the development and innovation of optics in the future. Here, by utilizing the...
Conference Paper
We demonstrate an energetic ultrafast laser source that simultaneously provides three-color pulses tunable from 925 nm to 1150 nm with energy up to 75 nJ. The repetition-rate can be tuned from 1 to 20 MHz.
Conference Paper
We incorporate circularly polarized seeding pulses and high-dispersion mirror compressor into pre-chirp managed amplification and obtain 50-MHz, 47-fs pulses with 101.2-W average power. The efficiency of the pulse compression is >98%.
Article
Full-text available
In this article, a high-quality saturable absorber (SA) based on a two-dimensional ternary chalcogenide Ta 2 NiS 5 nanosheet has been successfully fabricated and used in 1- and 1.5-μm spectral regions to generate ultrafast laser pulses. The Ta 2 NiS 5 -based SA is fabricated by mechanical exfoliation and sandwiched between two fiber ferrules to for...
Article
We demonstrate ultra-low-noise carrier-envelope phase stabilization of a Kerr-lens mode-locked Yb:CYA laser frequency comb, which is the first time, to the best of our knowledge, that the feed-forward method has been applied to 1 μm all-solid-state lasers. We obtain a signal-to-noise ratio of more than 38 dB at a 100 kHz resolution bandwidth for ca...
Article
Full-text available
We report a high-power femtosecond optical parametric oscillator (OPO) based on BiB3O6 crystal with a repetition rate of 755 MHz, which is 10 times that of the pump laser. With 3.75 W pump power from a 90 fs frequency-doubled mode-locked Yb:KGW oscillator, the OPO can provide signal pulses tunable over a spectral range from 693 to 1000 nm and idler...
Article
In this paper, we demonstrate excellent ultrafast optical performance of ternary transition metal dichalcogenide ReS1.02Se0.98 saturable absorber with high power tolerance and large modulation depth in thulium-doped fiber laser. Q-switching with tunable repetition frequency and pulse duration, and mode-locking with high pulse energy were generated...
Article
Full-text available
We demonstrated a diode-pumped high-power Kerr-lens mode-locked Yb:CaYAlO4 (Yb:CALYO) laser with a dual-confocal cavity, directly generating 59-fs pulses with 6.2 W average power, which is the highest average power from any sub-60 fs Yb-doped solid-state lasers. With the repetition rate of 50 MHz, the corresponding single pulse energy was 124 nJ an...
Article
Full-text available
We present an f-to-2f interferometry method to simultaneously measure and control the relative timing (RT) and carrier-envelope phase (CEP) of an arbitrarily tailored optical-field waveform. Long-term stabilization of the phase-locking system results in a CEP stability of 280 mrad and a RT stability of 110 attosecond over 8 h at a repetition rate o...
Article
Transition metal dichalcogenides have recently been considered the candidates for saturable absorption materials due to their advantages in both electronic and optoelectronic. Compared with MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> and WS <sub xmlns:mml="http://www.w3.org/1998/Math/Ma...
Article
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We fabricated the tenary ReS2(1-x)Se2x and investigated few-layer ReS1.02Se0.98 nanoflakes to realize the passively Q-switched and noise-like pulses operating at 1μm wavelength.Stable Q-switching pulses can be achieved with a threshold pump power of 180 mW and a maximum pump power of 300 mW. The single pulse energy of 81.47 nJ and pulse width as na...
Article
Full-text available
We report Q-switched and mode-locked erbium-doped all-fiber lasers using ternary ReS2(1−x)Se2x as saturable absorbers (SAs). The modulation depth and saturable intensity of the film SA are 1.8% and 0.046 MW/cm2. In Q-switched mechanism output, the pulse was centered at 1531.1 nm with maximum pulse energy and minimum pulse width of 28.29 nJ and 1.07...
Conference Paper
We demonstrate a 1-MHz ultrafast fiber-optic source that produces ~100-fs pulses tunable from 940 nm to 1250 nm with up to 33-nJ pulse energy. Such a source is ideal for driving multi-photon microscopy.
Conference Paper
We report a precision feed-forward locking between a 1064 nm CW laser and an ultra-stable frequency comb. The relative linewidth of the 1064nm CW laser is 1.14 mHz and the stability reaches 1.5×10−17/s.