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Cheng Wang - One of the best experts on this subject based on the ideXlab platform.
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339 j high energy ti sapphire chirped Pulse amplifier for 10 pw laser facility
Optics Letters, 2018Co-Authors: Wenqi Li, Lianghong Yu, Lu Xu, Yin Hang, Jianye Wang, Min Xu, Yi Xu, Cheng Wang, Pei Huang, Xiaobo ZhangAbstract:We report on the laser Pulse output of 339 J centered at 800 nm from a chirped-Pulse amplification (CPA) Ti:sapphire laser system at the Shanghai Superintense Ultrafast Laser Facility. The experimental results demonstrated that the parasitic lasing as well as the transverse amplified spontaneous emission of the homemade 235-mm-diameter Ti:sapphire final amplifier were suppressed successfully via the temporal dual-Pulse pumped scheme and the index-matching liquid cladding technique. The maximum pump-to-signal conversion efficiency of 32.1% was measured for the final amplifier. With a compressor transmission efficiency of 64% and a Compressed Pulse duration of 21 fs obtained for the sample light at a lower energy level, this laser system could potentially generate a Compressed laser Pulse with a peak power of 10.3 PW. The experimental results represent significant progress with respect to the CPA laser.
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high contrast front end based on cascaded xpwg and femtosecond opa for 10 pw level ti sapphire laser
Optics Express, 2018Co-Authors: Yanqi Liu, Cheng Wang, Xiaojun Yang, Zhengzheng Liu, Yanli Yang, Yuxin LengAbstract:By combining cross-polarized wave generation and femtosecond optical parametric amplification, a high-contrast front end featuring ultrahigh contrast, a broadband spectrum, an excellent beam profile, and good stability is built for a 10-PW-level Ti:sapphire laser in the Shanghai Superintense Ultrafast Laser Facility (SULF-10PW laser). The front end can deliver a cleaned Pulse with a 110 μJ energy at 1 kHz, and the bandwidth of the cleaned Pulse exceeds 60 nm (FWHM), which can support a 17 fs Compressed Pulse duration. The measured output energy fluctuation in one hour is <1.8% in rms value. The measurement-limited contrast is 10−10 at 3 ps before the main Pulse. Utilizing the high-contrast front end, single-shot contrast at 10−10 level has been demonstrated in the SULF-10PW laser at a 24 fs Pulse duration.
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200 j high efficiency ti sapphire chirped Pulse amplifier pumped by temporal dual Pulse
Optics Express, 2017Co-Authors: Lianghong Yu, Lu Xu, Wenqi Li, Yi Xu, Cheng Wang, Shuai Li, Xiaoyan Liang, Xiaolong Yuan, Jun Lu, Haihe LuAbstract:We report on an experimental and theoretical study of a large-aperture Ti:Sapphire (Ti:S) amplifier pumped with a novel temporal dual-Pulse scheme to suppress the parasitic lasing (PL) and transverse amplified spontaneous emission (TASE) for high-energy chirped-Pulse amplification (CPA). The pump energy distribution was optimized and the time delay between each pump Pulse was controlled precisely. Both the numerical and experimental results confirm that the temporal dual-Pulse pump technique can effectively suppress PL and TASE. The maximum output energy of 202.8 J was obtained from the final 150-mm-diameter Ti:S booster amplifier with a pump energy of 320.0 J, corresponding to a conversion efficiency of 49.3%. The Compressed Pulse duration of 24.0 fs was measured with a throughput efficiency of 64%, leading to a peak power of 5.4 PW. This novel temporal dual-Pulse pump technique has potential applications in a 10 PW CPA laser system.
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high energy large aperture ti sapphire amplifier for 5 pw laser Pulses
Optics Letters, 2015Co-Authors: Yuxi Chu, Cheng Wang, Xiaoyan Liang, Dingjun Yin, Zebiao Gan, Xinliang Wang, Yuxin LengAbstract:We report on the generation of 192.3 J centered at 800 nm wavelength from a chirped-Pulse amplification (CPA) Ti:sapphire laser system. The experimental results demonstrate that parasitic lasing can be suppressed successfully in the final amplifier based on a Ti:sapphire crystal of 150 mm in diameter. An over 50% pump-to-signal conversion efficiency was measured for the final amplifier by optimizing the time delay of two pump Pulses and enhancing the injected seed energy. With 72% compressor throughput efficiency and 27 fs long Compressed Pulse duration obtained at a lower energy level, this laser could potentially support a Compressed laser Pulse of 5.13 PW peak power. The experimental results represent notable progress regarding the CPA laser.
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experimental demonstration of joule level non collinear optical parametric chirped Pulse amplification in yttrium calcium oxyborate
Optics Letters, 2012Co-Authors: Xiaoyan Liang, Cheng Wang, Yanqing Zheng, Yuxin LengAbstract:In this Letter, we report on what is, to our knowledge, the first experimental demonstration of yttrium calcium oxyborate (YCOB) for joule-level and broadband non-collinear optical parametric chirped-Pulse amplification centered at 800 nm. Based on a Ti:sapphire chirped-Pulse amplification front end, an amplified signal energy of 3.36 J was generated with a pump of 35 J in the crystal. Compressed Pulse duration of 44.3 fs, with a bandwidth of 49 nm, was achieved. The results confirm that YCOB crystal is another potential alternative as a final amplifier besides Ti:sapphire in a petawatt laser at 800 nm.
Yuxin Leng - One of the best experts on this subject based on the ideXlab platform.
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high contrast front end based on cascaded xpwg and femtosecond opa for 10 pw level ti sapphire laser
Optics Express, 2018Co-Authors: Yanqi Liu, Cheng Wang, Xiaojun Yang, Zhengzheng Liu, Yanli Yang, Yuxin LengAbstract:By combining cross-polarized wave generation and femtosecond optical parametric amplification, a high-contrast front end featuring ultrahigh contrast, a broadband spectrum, an excellent beam profile, and good stability is built for a 10-PW-level Ti:sapphire laser in the Shanghai Superintense Ultrafast Laser Facility (SULF-10PW laser). The front end can deliver a cleaned Pulse with a 110 μJ energy at 1 kHz, and the bandwidth of the cleaned Pulse exceeds 60 nm (FWHM), which can support a 17 fs Compressed Pulse duration. The measured output energy fluctuation in one hour is <1.8% in rms value. The measurement-limited contrast is 10−10 at 3 ps before the main Pulse. Utilizing the high-contrast front end, single-shot contrast at 10−10 level has been demonstrated in the SULF-10PW laser at a 24 fs Pulse duration.
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high energy large aperture ti sapphire amplifier for 5 pw laser Pulses
Optics Letters, 2015Co-Authors: Yuxi Chu, Cheng Wang, Xiaoyan Liang, Dingjun Yin, Zebiao Gan, Xinliang Wang, Yuxin LengAbstract:We report on the generation of 192.3 J centered at 800 nm wavelength from a chirped-Pulse amplification (CPA) Ti:sapphire laser system. The experimental results demonstrate that parasitic lasing can be suppressed successfully in the final amplifier based on a Ti:sapphire crystal of 150 mm in diameter. An over 50% pump-to-signal conversion efficiency was measured for the final amplifier by optimizing the time delay of two pump Pulses and enhancing the injected seed energy. With 72% compressor throughput efficiency and 27 fs long Compressed Pulse duration obtained at a lower energy level, this laser could potentially support a Compressed laser Pulse of 5.13 PW peak power. The experimental results represent notable progress regarding the CPA laser.
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experimental demonstration of joule level non collinear optical parametric chirped Pulse amplification in yttrium calcium oxyborate
Optics Letters, 2012Co-Authors: Xiaoyan Liang, Cheng Wang, Yanqing Zheng, Yuxin LengAbstract:In this Letter, we report on what is, to our knowledge, the first experimental demonstration of yttrium calcium oxyborate (YCOB) for joule-level and broadband non-collinear optical parametric chirped-Pulse amplification centered at 800 nm. Based on a Ti:sapphire chirped-Pulse amplification front end, an amplified signal energy of 3.36 J was generated with a pump of 35 J in the crystal. Compressed Pulse duration of 44.3 fs, with a bandwidth of 49 nm, was achieved. The results confirm that YCOB crystal is another potential alternative as a final amplifier besides Ti:sapphire in a petawatt laser at 800 nm.
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parasitic lasing suppression in high gain femtosecond petawatt ti sapphire amplifier
Optics Express, 2007Co-Authors: Xiaoyan Liang, Cheng Wang, Yuxin Leng, Lihuang Lin, Baozhen Zhao, Yunhua Jiang, Chunmei Zhang, Dingjun Yin, Yongliang Jiang, Hui WeiAbstract:New parasitic lasing suppression techniques are developed and high gain amplification is demonstrated in a petawatt level Ti:sapphire amplifier based on the chirped Pulse amplification (CPA) scheme. Cladding the large aperture Ti:sapphire with refractive-index matched liquid doped with absorber suppresses the transverse lasing. The acousto-optic programmable dispersive filter (AOPDF) is used to realize side-lobe suppression in the temporal profile of the Compressed Pulse. The 800 nm laser output with peak power of 0.89 PW and Pulse width of 29.0 fs is demonstrated.
Xiaoyan Liang - One of the best experts on this subject based on the ideXlab platform.
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200 j high efficiency ti sapphire chirped Pulse amplifier pumped by temporal dual Pulse
Optics Express, 2017Co-Authors: Lianghong Yu, Lu Xu, Wenqi Li, Yi Xu, Cheng Wang, Shuai Li, Xiaoyan Liang, Xiaolong Yuan, Jun Lu, Haihe LuAbstract:We report on an experimental and theoretical study of a large-aperture Ti:Sapphire (Ti:S) amplifier pumped with a novel temporal dual-Pulse scheme to suppress the parasitic lasing (PL) and transverse amplified spontaneous emission (TASE) for high-energy chirped-Pulse amplification (CPA). The pump energy distribution was optimized and the time delay between each pump Pulse was controlled precisely. Both the numerical and experimental results confirm that the temporal dual-Pulse pump technique can effectively suppress PL and TASE. The maximum output energy of 202.8 J was obtained from the final 150-mm-diameter Ti:S booster amplifier with a pump energy of 320.0 J, corresponding to a conversion efficiency of 49.3%. The Compressed Pulse duration of 24.0 fs was measured with a throughput efficiency of 64%, leading to a peak power of 5.4 PW. This novel temporal dual-Pulse pump technique has potential applications in a 10 PW CPA laser system.
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high energy large aperture ti sapphire amplifier for 5 pw laser Pulses
Optics Letters, 2015Co-Authors: Yuxi Chu, Cheng Wang, Xiaoyan Liang, Dingjun Yin, Zebiao Gan, Xinliang Wang, Yuxin LengAbstract:We report on the generation of 192.3 J centered at 800 nm wavelength from a chirped-Pulse amplification (CPA) Ti:sapphire laser system. The experimental results demonstrate that parasitic lasing can be suppressed successfully in the final amplifier based on a Ti:sapphire crystal of 150 mm in diameter. An over 50% pump-to-signal conversion efficiency was measured for the final amplifier by optimizing the time delay of two pump Pulses and enhancing the injected seed energy. With 72% compressor throughput efficiency and 27 fs long Compressed Pulse duration obtained at a lower energy level, this laser could potentially support a Compressed laser Pulse of 5.13 PW peak power. The experimental results represent notable progress regarding the CPA laser.
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experimental demonstration of joule level non collinear optical parametric chirped Pulse amplification in yttrium calcium oxyborate
Optics Letters, 2012Co-Authors: Xiaoyan Liang, Cheng Wang, Yanqing Zheng, Yuxin LengAbstract:In this Letter, we report on what is, to our knowledge, the first experimental demonstration of yttrium calcium oxyborate (YCOB) for joule-level and broadband non-collinear optical parametric chirped-Pulse amplification centered at 800 nm. Based on a Ti:sapphire chirped-Pulse amplification front end, an amplified signal energy of 3.36 J was generated with a pump of 35 J in the crystal. Compressed Pulse duration of 44.3 fs, with a bandwidth of 49 nm, was achieved. The results confirm that YCOB crystal is another potential alternative as a final amplifier besides Ti:sapphire in a petawatt laser at 800 nm.
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parasitic lasing suppression in high gain femtosecond petawatt ti sapphire amplifier
Optics Express, 2007Co-Authors: Xiaoyan Liang, Cheng Wang, Yuxin Leng, Lihuang Lin, Baozhen Zhao, Yunhua Jiang, Chunmei Zhang, Dingjun Yin, Yongliang Jiang, Hui WeiAbstract:New parasitic lasing suppression techniques are developed and high gain amplification is demonstrated in a petawatt level Ti:sapphire amplifier based on the chirped Pulse amplification (CPA) scheme. Cladding the large aperture Ti:sapphire with refractive-index matched liquid doped with absorber suppresses the transverse lasing. The acousto-optic programmable dispersive filter (AOPDF) is used to realize side-lobe suppression in the temporal profile of the Compressed Pulse. The 800 nm laser output with peak power of 0.89 PW and Pulse width of 29.0 fs is demonstrated.
H Ozaki - One of the best experts on this subject based on the ideXlab platform.
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a low power and high speed data transfer scheme with asynchronous Compressed Pulse width modulation for as memory
IEEE Journal of Solid-state Circuits, 1996Co-Authors: T Yamauchi, Yoshikazu Morooka, H OzakiAbstract:This paper describes an approach to a low power and high speed data transfer scheme in the internal data bus of an AS-Memory which has ASIC circuitry and memory array. Pulse width modulation, which is operated asynchronously, is applied to the wide internal data bus. An automatic gain controlled amplifier which amplifies many small signals from the memory array is also newly developed to achieve a fast data output. Applying this architecture to an AS-Memory, the area and power consumption of the internal data bus interface can be reduced to 25% and 36%, respectively.
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a low power and high speed data transfer scheme with asynchronous Compressed Pulse width modulation for as memory
Symposium on VLSI Circuits, 1995Co-Authors: T Yamauchi, Yoshikazu Morooka, H OzakiAbstract:We propose a high speed and low power data transfer scheme for the wide internal data bus of an AS-Memory using the asynchronous Compressed Pulse width modulation (AC-PWM) technique and an automatic gain controlled (AGC) amplifier. The maximum bit rate per bus of AC-PWM increases by 12 times that of the conventional 100MHz data bus. The AGC amplifier achieves a fast data output while reducing by 1/3 the standby current. The proposed architecture is a key advance in the future development of AS-Memories.
Ingmar Hartl - One of the best experts on this subject based on the ideXlab platform.
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intra burst Pulse characterization of a high power post Compressed yb yag laser at 100 khz repetition rate
European Quantum Electronics Conference, 2021Co-Authors: Annelise Viotti, Ingmar Hartl, Skirmantas Alisauskas, Henrik Tunnermann, Esmerando Escoto, Marcus Seidel, Katharina Dudde, Bastian Manschwetus, Christoph M HeylAbstract:High-average power Ytterbium (Yb) laser systems are playing an increasingly important role in ultrafast science e.g. as pump lasers for optical parametric amplifiers or directly as ultrafast sources. The gain bandwidth of Yb limits the Pulse duration to a few 100 fs up to about 1 ps. However, many applications, such as attosecond physics or X-ray Free Electron Laser (FEL) science, would greatly benefit from the combination of high average powers with much shorter Pulses, achievable via post-compression. Nonlinear Pulse post-compression of high-average power Yb lasers employing multi-pass cell (MPC) -based spectral broadening [1] , [2] was recently implemented for two burst-mode pump-probe lasers at the FEL facility FLASH in Hamburg [3] , [4] . For such lasers, precise characterization and control of intra-burst Pulse dynamics is crucial as the post-compression process couples input Pulse energy instabilities with important output Pulse parameters such as spectrum, Pulse length and temporal contrast. Here, we demonstrate 100 kHz intra-burst spectrum, phase and temporal contrast characterization of a Yb:YAG Innoslab burst-mode amplifier post-Compressed in a gas-filled MPC. Our measurements reveal a stable broadened spectrum and Compressed Pulse duration within the flat part of the burst, yielding a relative energy content of about 80% in the main Compressed fs Pulse (250 fs window versus 4 ps background pedestal).
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compact all pm fiber integrated and alignment free ultrafast yb fiber nalm laser with sub femtosecond timing jitter
Journal of Lightwave Technology, 2021Co-Authors: Sarper Salman, Yi Hua, Christoph Mahnke, Stefan Droste, Jakob Fellinger, Aline S Mayer, Oliver H Heckl, Christoph M Heyl, Ingmar HartlAbstract:We report a simple and compact design of a dispersion compensated mode-locked Yb:fiber oscillator based on a nonlinear amplifying loop mirror (NALM). The fully polarization maintaining (PM) fiber integrated laser features a chirped fiber Bragg grating (CFBG) for dispersion compensation and a fiber integrated compact non-reciprocal phase bias device, which is alignment-free. The main design parameters were determined by numerically simulating the Pulse evolution in the oscillator and by analyzing their impact on the laser performance. Experimentally, we achieved an 88 fs Compressed Pulse duration with sub-fs timing jitter at 54 MHz repetition rate and 51 mW of output power with $5.5\times 10^{-5}$ [20 Hz, 1 MHz] integrated relative intensity noise (RIN). Furthermore, we demonstrate tight phase-locking of the laser's carrier-envelope offset frequency ( $f_{\text{ceo}}$ ) to a stable radio frequency (RF) reference and of one frequency comb tooth to a stable optical reference at 291 THz.
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compact all pm fiber integrated and alignment free ultrafast yb fiber nalm laser with sub femtosecond timing jitter
arXiv: Optics, 2021Co-Authors: Sarper Salman, Yi Hua, Christoph Mahnke, Stefan Droste, Jakob Fellinger, Aline S Mayer, Oliver H Heckl, Christoph M Heyl, Ingmar HartlAbstract:We report a simple and compact design of a dispersion compensated mode-locked Yb:fiber oscillator based on a nonlinear amplifying loop mirror (NALM). The fully polarization maintaining (PM) fiber integrated laser features a chirped fiber Bragg grating (CFBG) for dispersion compensation and a fiber integrated compact non-reciprocal phase bias device, which is alignment-free. The main design parameters were determined by numerically simulating the Pulse evolution in the oscillator and by analyzing their impact on the laser performance. Experimentally, we achieved an 88 fs Compressed Pulse duration with sub-fs timing jitter at 54 MHz repetition rate and 51 mW of output power with 5.5 * 10-5 [20 Hz, 1 MHz] integrated relative intensity noise (RIN). Furthermore, we demonstrate tight phase-locking of the laser's carrier-envelope offset frequency (fceo) to a stable radio frequency (RF) reference and of one frequency comb tooth to a stable optical reference at 291 THz.