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Attosecond science is one of the driving forces for developing the femtosecond amplifiers of high average power and ultrashort pulse duration. In this work, the regenerative amplification is studied experimentally and theoretically based on Yb:CaYAlO4 crystal for the practical needs of high-repetition-rate attosecond light sources. In the theoretical study, a mode-tunable regenerative cavity with good thermal stability is designed based on the thermal lens calculations of Yb:CaYAlO4 crystal; the amplified output energy and spectra of π and σ polarization of the crystal are calculated. In the experiment, the π-axis of Yb:CaYAlO4 crystal is parallel to the laser polarization, and the laser amplifier emits 1.61 mJ pulses with average power 16.1 W. Notably, the dip of the π-polarization emission spectrum near 1025.1 nm compensates for the gain narrowing of the seed laser during amplification. Thus, the center wavelength and the spectral full width at a half maximum of the amplified laser are 1030 nm and 16 nm respectively. Using a grating-pair for compression, 149 fs pulses with peak power 9.5 GW are obtained. In comparison, the σ-polarization emission spectrum of Yb:CaYAlO4 crystal is relatively flat in a range from 1000 to 1050 nm, but with a larger gain cross-section. When the laser polarization is parallel to the σ-axis of Yb:CaYAlO4 crystal, 2.87 mJ pulses at 10 kHz repetition rate are achieved, with an average power of 28.7 W. In this case, the center wavelength and the spectral full width at half maximum of the amplified laser are 1037 nm and 11 nm respectively. Using a grating-pair for compression, 178 fs pulses with peak power of 14.2 GW are obtained. The beam quality factor measured is 1.09 along the x-axis of the amplified laser and 1.17 along the y-axis. To the best of our knowledge, this is the highest average power and the maximum pulse energy obtained from the Yb:CaYAlO4 amplifier. For applications in high-repetition-rate attosecond light sources, terahertz generation and optical parametric amplification, subsequent laser outputs with average power 200 W, pulse energy 20 mJ and pulse duration less than 200 fs are expected to be achieved by adding two stages of traveling-wave amplification.
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Keywords:
- ytterbium-doped laser crystal /
- regenerative amplifier /
- high power femtosecond laser /
- attosecond science
[1] Midorikawa K 2022 Nat. Photonics 16 267Google Scholar
[2] D’Arcy R, Chappell J, Beinortaite J, et al. 2022 Nature 603 58Google Scholar
[3] Lloyd-Hughes J, Oppeneer P M, Pereira dos Santos T, et al. 2021 J. Phys. Condens. Matter 33 353001Google Scholar
[4] Maiuri M, Garavelli M, Cerullo G 2020 J. Am. Chem. Soc. 142 3Google Scholar
[5] Kroll F, Brack F E, Bernert C, et al. 2022 Nat. Phys. 18 316Google Scholar
[6] Lin Z Y, Hong M H 2021 Ultrafast Sci. 2021 9783514
[7] C. Phillips K, H. Gandhi H, Mazur E, Sundaram S K 2015 Adv. Opt. Photonics 7 684Google Scholar
[8] Iwasawa H 2020 Electron. Struct. 2 043001Google Scholar
[9] Zheng W, Jiang P Z, Zhang L F, Wang Y, Sun Q, Liu Y Q, Gong Q H, Wu C Y 2021 Rev. Sci. Instrum. 92 043709Google Scholar
[10] Miao J W, Ishikawa T, K. Robinson I, M. Murnane M 2015 Science 348 530Google Scholar
[11] Auböck G, Consani C, Mourik F V, Chergui M 2012 Opt. Lett. 37 2337Google Scholar
[12] Hönninger C, Paschotta R, Graf M, et al. 1999 Appl. Phys. B 69 3
[13] 朱江峰, 田文龙, 高子叶, 魏志义 2017 中国激光 44 0900001Google Scholar
Zhu J F, Tian W L, Gao Z Y, Wei Z Y 2017 Chin. J. Lasers 44 0900001Google Scholar
[14] 白川, 田文龙, 王阁阳, 郑立, 徐瑞, 张大成, 王兆华, 朱江峰, 魏志义 2021 中国激光 48 0501005Google Scholar
Bai C, Tian W L, Wang G Y, Zheng L, Xu R, Zhang D C, Wang Z H, Zhu J F, Wei Z Y 2021 Chin. J. Lasers 48 0501005Google Scholar
[15] Russbueldt P, Mans T, Weitenberg J, Hoffmann H D, Poprawe R 2010 Opt. Lett. 35 4169Google Scholar
[16] Negel J P, Voss A, Ahmed M A, Bauer D, Sutter D, Killi A, Graf T 2013 Opt. Lett. 38 5442Google Scholar
[17] Li D Z, Xu X D, Zhu H M, Chen X Y, Tan W D, Zhang J, Tang D Y, Ma J, Wu F, Xia C T, Xu J 2011 J. Opt. Soc. Am. B 28 1650Google Scholar
[18] Rudenkov A, Kisel V, Yasukevich A, Hovhannesyan K, Petrosyan A, Kuleshov N 2016 Opt. Lett. 41 2249Google Scholar
[19] Rudenkov A, Kisel V, Yasukevich A, Hovhannesyan K, Petrosyan A, Kuleshov N 2018 Devices Methods Meas. 9 205
[20] S. Petrov L, Georgiev K, Velkov D, Trifonov A, Xu X D, Xu J, Buchvarov I 2022 Conference on Lasers and Electro-Optics San Jose The United States of America, May 15–20, 2022 pJTh3B.23
[21] Loiko P, Becker P, Bohatý L, et al. 2017 Opt. Lett. 42 2275Google Scholar
[22] Dörring J, Killi A, Morgner U, Lang A, Lederer M, Kopf D 2004 Opt. Express 12 1759Google Scholar
[23] Kroetz P, Ruehl A, Murari K, Cankaya H, Kärtner F X, Hartl I, Miller R J D 2016 Opt. Express 24 9905Google Scholar
[24] Ye P, Oldal L G, Csizmadia T, Filus Z, Grósz T, Jójárt P, Seres I, Bengery Z, Gilicze B, Kahaly S, Varjú K, Major B 2022 Ultrafast Sci. 2022 9823783
[25] 王天泽, 雷弘毅, 孙方正, 王丹, 廖国前, 李玉同 2021 物理学报 70 085205Google Scholar
Wang T Z, Lei H Y, Sun F Z, Wang D, Liao G Q, Li Y T 2021 Acta Phys. Sin. 70 085205Google Scholar
[26] 马文君, 刘志鹏, 王鹏杰, 赵家瑞, 颜学庆 2021 物理学报 70 084102Google Scholar
Ma W J, Liu Z P, Wang P J, Zhao J R, Yan X Q 2021 Acta Phys. Sin. 70 084102Google Scholar
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图 5 Yb:CYA再生放大器实验装置 (Seed为Yb:KGW振荡器, HR为平面高反镜片, λ/2为1/2波片, PBS为偏振分光棱镜, FR为法拉第旋光器, TG为透射光栅, M1为平凹反射镜, F为激光透镜, λ/4为1/4波片, HV为高压驱动, PC为普克尔盒, Crystal为激光晶体, M2为激光双色镜, LD为981 nm半导体激光器, DM为激光双色镜, PM为功率计, PD为光电探测器)
Figure 5. Experimental set-up of the Yb:CYA regenerative amplifier. (Seed, Yb:KGW oscillator; HR, dielectric flat mirror; λ/2, half-wave plate; PBS, polarizing beam splitter; FR, faraday rotator; TG, transmission grating; M1, concave laser mirror; F, lens; λ/4, quarter wave plate; HV, pockels cell driver; PC, pockels cell; Crystal, Yb:CYA crystal; M2, dichroic mirror; LD, 981 nm laser diode; DM, dichroic mirror; PM, power meter; PD, photodiode).
表 1 Yb:CYA晶体的热性质参数
Table 1. Parameters of thermal performance for Yb:CYA crystal.
晶体
轴向热导率/
(W·m–1·K–1)折射率
n密度/
(g·cm–3)热光系数/
(10–6 K–1)热膨胀系数/
(10–6 K–1)比热容/
(J·g–1·K–1)
(301 K)π 3.2 1.886 4.748 –7.8 8.99 0.593 σ 3.6 1.909 –8.7 8.97 表 2 Yb:CYA晶体π和σ偏振放大参数比较
Table 2. Comparison of amplification indicators for π and σ axes of Yb:CYA crystal.
偏振 类型 平均功率
P/W重复频率
f/kHz脉冲能量
E/mJ中心波长
λ/nm光谱宽度
Δλ/nm脉冲宽度
τ/fsπ 仿真 20.3 10 2.03 1030 14 115 实验 16.1 10 1.61 1030 16 149 σ 仿真 29.1 10 2.91 1034 13 117 实验 28.7 10 2.87 1037 11 178 -
[1] Midorikawa K 2022 Nat. Photonics 16 267Google Scholar
[2] D’Arcy R, Chappell J, Beinortaite J, et al. 2022 Nature 603 58Google Scholar
[3] Lloyd-Hughes J, Oppeneer P M, Pereira dos Santos T, et al. 2021 J. Phys. Condens. Matter 33 353001Google Scholar
[4] Maiuri M, Garavelli M, Cerullo G 2020 J. Am. Chem. Soc. 142 3Google Scholar
[5] Kroll F, Brack F E, Bernert C, et al. 2022 Nat. Phys. 18 316Google Scholar
[6] Lin Z Y, Hong M H 2021 Ultrafast Sci. 2021 9783514
[7] C. Phillips K, H. Gandhi H, Mazur E, Sundaram S K 2015 Adv. Opt. Photonics 7 684Google Scholar
[8] Iwasawa H 2020 Electron. Struct. 2 043001Google Scholar
[9] Zheng W, Jiang P Z, Zhang L F, Wang Y, Sun Q, Liu Y Q, Gong Q H, Wu C Y 2021 Rev. Sci. Instrum. 92 043709Google Scholar
[10] Miao J W, Ishikawa T, K. Robinson I, M. Murnane M 2015 Science 348 530Google Scholar
[11] Auböck G, Consani C, Mourik F V, Chergui M 2012 Opt. Lett. 37 2337Google Scholar
[12] Hönninger C, Paschotta R, Graf M, et al. 1999 Appl. Phys. B 69 3
[13] 朱江峰, 田文龙, 高子叶, 魏志义 2017 中国激光 44 0900001Google Scholar
Zhu J F, Tian W L, Gao Z Y, Wei Z Y 2017 Chin. J. Lasers 44 0900001Google Scholar
[14] 白川, 田文龙, 王阁阳, 郑立, 徐瑞, 张大成, 王兆华, 朱江峰, 魏志义 2021 中国激光 48 0501005Google Scholar
Bai C, Tian W L, Wang G Y, Zheng L, Xu R, Zhang D C, Wang Z H, Zhu J F, Wei Z Y 2021 Chin. J. Lasers 48 0501005Google Scholar
[15] Russbueldt P, Mans T, Weitenberg J, Hoffmann H D, Poprawe R 2010 Opt. Lett. 35 4169Google Scholar
[16] Negel J P, Voss A, Ahmed M A, Bauer D, Sutter D, Killi A, Graf T 2013 Opt. Lett. 38 5442Google Scholar
[17] Li D Z, Xu X D, Zhu H M, Chen X Y, Tan W D, Zhang J, Tang D Y, Ma J, Wu F, Xia C T, Xu J 2011 J. Opt. Soc. Am. B 28 1650Google Scholar
[18] Rudenkov A, Kisel V, Yasukevich A, Hovhannesyan K, Petrosyan A, Kuleshov N 2016 Opt. Lett. 41 2249Google Scholar
[19] Rudenkov A, Kisel V, Yasukevich A, Hovhannesyan K, Petrosyan A, Kuleshov N 2018 Devices Methods Meas. 9 205
[20] S. Petrov L, Georgiev K, Velkov D, Trifonov A, Xu X D, Xu J, Buchvarov I 2022 Conference on Lasers and Electro-Optics San Jose The United States of America, May 15–20, 2022 pJTh3B.23
[21] Loiko P, Becker P, Bohatý L, et al. 2017 Opt. Lett. 42 2275Google Scholar
[22] Dörring J, Killi A, Morgner U, Lang A, Lederer M, Kopf D 2004 Opt. Express 12 1759Google Scholar
[23] Kroetz P, Ruehl A, Murari K, Cankaya H, Kärtner F X, Hartl I, Miller R J D 2016 Opt. Express 24 9905Google Scholar
[24] Ye P, Oldal L G, Csizmadia T, Filus Z, Grósz T, Jójárt P, Seres I, Bengery Z, Gilicze B, Kahaly S, Varjú K, Major B 2022 Ultrafast Sci. 2022 9823783
[25] 王天泽, 雷弘毅, 孙方正, 王丹, 廖国前, 李玉同 2021 物理学报 70 085205Google Scholar
Wang T Z, Lei H Y, Sun F Z, Wang D, Liao G Q, Li Y T 2021 Acta Phys. Sin. 70 085205Google Scholar
[26] 马文君, 刘志鹏, 王鹏杰, 赵家瑞, 颜学庆 2021 物理学报 70 084102Google Scholar
Ma W J, Liu Z P, Wang P J, Zhao J R, Yan X Q 2021 Acta Phys. Sin. 70 084102Google Scholar
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