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  • Optica Publishing Group  (5)
  • Qian, Junyu  (5)
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  • Optica Publishing Group  (5)
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  • 1
    Online Resource
    Online Resource
    Few-cycle mid-infrared laser based on nonlinear self-compression in solid thin plates
    Optica Publishing Group ; 2021
    In:  Optics Letters Vol. 46, No. 19 ( 2021-10-01), p. 5075-
    Details
    In: Optics Letters, Optica Publishing Group, Vol. 46, No. 19 ( 2021-10-01), p. 5075-
    Abstract: A few-cycle mid-infrared (MIR) laser is demonstrated via nonlinear self-compression in solid thin plates. In this novel solution, the anomalous material dispersion in the MIR band and the chirp induced by self-phase modulation are mutually compensated, which can achieve self-compression. Finally, with the 4 µm laser injection with 4.8 mJ/155 fs and few-cycle pulses with 3.44 mJ, 29.4 fs are generated with a high efficiency of 71.7%, and the system maintains very good spectral stability in 10 days. Compared with other post-compression methods, this self-compression technique has the advantages of high efficiency and robust and large energy expansion scale, which can be further extended to MIR lasers with other wavelengths and higher peak power.
    Type of Medium: Online Resource
    ISSN: 0146-9592 , 1539-4794
    URL: Article
    DOI: 10.1364/OL.442105
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
    detail.hit.zdb_id: 243290-0
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  • 2
    Online Resource
    Online Resource
    Pulse combination and compression in hollow-core fiber for few-cycle intense mid-infrared laser generation
    Optica Publishing Group ; 2021
    In:  Photonics Research Vol. 9, No. 4 ( 2021-04-01), p. 477-
    Details
    In: Photonics Research, Optica Publishing Group, Vol. 9, No. 4 ( 2021-04-01), p. 477-
    Abstract: The generation of high-peak-power, few-cycle mid-infrared (MIR) pulses using coherent beam combination and nonlinear pulse compression techniques simultaneously is demonstrated. The two pulses, with identical pulse energy of 2.8 mJ and pulse duration of 160 fs, are coherently combined at the input end of a krypton-filled hollow-core fiber (HCF), and then the bandwidth of the combined pulse is broadened to near an optical octave due to strong phase modulations, and the temporal width is compressed into a few-cycle regime. Finally, a 2.7 mJ, 22.9 fs, 20 Hz laser at 4 μm can be obtained, and the pulse peak power is greatly enhanced compared with that of conventional single-channel optical parametric chirped pulse-amplification systems. Furthermore, the peak power generated from this system has the prospect of further scaling up through use of more channels of coherent combination, which can pave a way to generate higher peak power ultra-intense MIR pulses for strong-field physics.
    Type of Medium: Online Resource
    ISSN: 2327-9125
    URL: Article
    DOI: 10.1364/PRJ.415794
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
    detail.hit.zdb_id: 2724783-1
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  • 3
    Online Resource
    Online Resource
    Femtosecond mid-IR optical vortex laser based on optical parametric chirped pulse amplification
    Optica Publishing Group ; 2020
    In:  Photonics Research Vol. 8, No. 3 ( 2020-03-01), p. 421-
    Details
    In: Photonics Research, Optica Publishing Group, Vol. 8, No. 3 ( 2020-03-01), p. 421-
    Abstract: A femtosecond mid-infrared optical vortex laser can be used for high harmonic generation to extend cutoff energy to the kilo-electron-volt range with orbital angular momentum, as well as other secondary radiations. For these, we demonstrate a high-energy femtosecond 4 μm optical vortex laser based on optical parametric chirped pulse amplification (OPCPA) for the first time. The optical vortex seed is generated from a femtosecond 4 μm laser by a silicon spiral phase plate with the topological charge l of 1 before the stretcher. Through using a two-stage collinear OPCPA amplifier, the chirped vortex pulse is amplified to 12.4 mJ with 200 nm full width at half-maximum bandwidth. After compression, the vortex laser pulse with 9.53 mJ, 119 fs can be obtained. Furthermore, the vortex characteristics of the laser beam are investigated and evaluated. This demonstration can scale to generate a higher-peak-power vortex mid-IR laser and pave a new way for high field physics.
    Type of Medium: Online Resource
    ISSN: 2327-9125
    URL: Article
    DOI: 10.1364/PRJ.385190
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2020
    detail.hit.zdb_id: 2724783-1
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  • 4
    Online Resource
    Online Resource
    High-order harmonic generation in an x-ray range from laser-induced multivalent ions of noble gas
    Optica Publishing Group ; 2022
    In:  Optica Vol. 9, No. 9 ( 2022-09-20), p. 1003-
    Details
    In: Optica, Optica Publishing Group, Vol. 9, No. 9 ( 2022-09-20), p. 1003-
    Abstract: Tabletop coherent x-ray sources extending to multi-keV or higher photon energies have versatile applications, including in 4D imaging and semiconductor detectors. However, these sources can be realized only via high-order harmonic generation (HHG) with an ∼ 10 µ m laser interacting with neutral atoms. As shown in previous work by Popmintchev et al. [ Science   350 , 1225 ( 2015 ) 10.1126/science.aac9755 SCIEAS00 36-8075 ], multiply ionized plasmas can efficiently produce hundred-eV harmonics with an ultraviolet laser. Here, we experimentally investigate multi-keV x-ray sources up to ∼ 5.2 k e V , the highest photon energy generated via HHG to date, to our knowledge, using a 1.45-µm driving laser that interacts with multivalent ions. Both the angular distribution and the ellipticity dependence of the signal are strong evidence of the HHG mechanism.
    Type of Medium: Online Resource
    ISSN: 2334-2536
    URL: Article
    DOI: 10.1364/OPTICA.456481
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 2779175-0
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  • 5
    Online Resource
    Online Resource
    Broad-bandwidth high-temporal-contrast carrier-envelope-phase-stabilized laser seed for 100  PW lasers
    Optica Publishing Group ; 2020
    In:  Optics Letters Vol. 45, No. 8 ( 2020-04-15), p. 2215-
    Details
    In: Optics Letters, Optica Publishing Group, Vol. 45, No. 8 ( 2020-04-15), p. 2215-
    Abstract: We demonstrate in this Letter the generation of carrier-envelope-phase (CEP)-stabilized laser pulses at 910 nm with simultaneously high-temporal-contrast, broad spectral bandwidths and few-cycle pulse durations. Through combining the techniques of cascaded optical parametric amplification (OPA) and second-harmonic generation (SHG) in the laser setup, a pulse temporal contrast as high as 〉 10 12 has been obtained at the laser output. During the OPA and SHG processes, both the pulse chirp and gain bandwidth are perfectly optimized, leading to the generation of 170 µJ pulses with 〉 200 n m bandwidth and ∼ 15 f s pulse duration. Moreover, the CEP of the laser is stabilized passively to a noise level of less than 340 mrad. This high-quality pulsed light source, as the seed laser of the deuterated potassium dihydrogen phosphate (DKDP)-based 100 PW system, will be integrated into the Station of Extreme Light facility in the near future.
    Type of Medium: Online Resource
    ISSN: 0146-9592 , 1539-4794
    URL: Article
    DOI: 10.1364/OL.390110
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2020
    detail.hit.zdb_id: 243290-0
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