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摘要: 报道了一种高功率、高光束质量的755 nm连续波翠绿宝石激光器。首先,对比研究了638 nm激光二极管(LDs)和532 nm固体激光器单端泵浦的翠绿宝石激光器。当638 nm LDs作为泵浦源时,得到的连续输出功率、光-光转换效率分别为3.9 W和19.7%。保持其他条件基本不变,将泵浦源换成532 nm激光器,得到的连续输出功率、光-光转换效率分别为2.1 W和10.0%。结果表明利用 638 nm LDs泵浦翠绿宝石可获得更高的激光功率和转换效率。此外,研究了638 nm LDs双端泵浦的翠绿宝石激光器,在755 nm处得到了6.2 W的连续输出功率,相应的光-光转换效率和斜效率分别为16.3%和24.2%,并且连续输出功率为5.0 W时的光束质量M2优于1.47,这是翠绿宝石激光器在近衍射极限下的最高连续输出功率。这种高功率、高光束质量的755 nm翠绿宝石激光器为连续波紫外激光器的研制提供了良好、稳定的基频源。
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关键词:
- Alexandrite /
- continuous-wave /
- end-pumping /
- laser diode
Abstract: A high power 755 nm continuous-wave (CW) laser with high beam quality based on the Alexandrite crystal was demonstrated. The Alexandrite lasers single-end-pumped by 638 nm laser diodes (LDs) and 532 nm solid-state laser were studied comparatively, then the CW output power, optical-to-optical conversion efficiency, and slope efficiency pumped by 638 nm LDs were 3.9 W, 19.7%, and 23.7%, respectively, while they were 2.1 W, 10.0%, and 12.9%, at nearly the same conditions except that it was pumped by 532 nm solid-state laser. The results show that the Alexandrite laser pumped with 638 nm LDs can obtain higher CW output power and higher conversion efficiency. Moreover, a CW output power of 6.2 W at 755 nm of Alexandrite laser double-end-pumped by a 638 nm LDs was achieved with the optical-to-optical conversion efficiency and the slope efficiency of 16.3% and 24.2%, respectively. The beam quality factor M2 was better than 1.47 at the CW output power of 5.0 W, which was the highest CW output power of Alexandrite laser with the diffraction limit to the best. This high power and high beam quality 755 nm Alexandrite laser provides the fundamental frequency source for the development of CW ultraviolet lasers.-
Key words:
- Alexandrite /
- continuous-wave /
- end-pumping /
- laser diode
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Figure 1. (a) Schematic of Alexandrite laser single-end-pumped by a 532 nm solid-state laser. (b) Schematic of Alexandrite laser single-end-pumped by a 638 nm LDs. M1-M2, high reflection mirrors; HWP, half-wave plate; RM, rear mirror; OC, output coupler; L1-L5, convex lenses; BC, beam collector; TFP, thin film polarizer
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[1] Wang J M, Bai J D, Wang Ji Y, et al. Realization of a watt-level 319-nm single-frequency CW ultraviolet laser and its application in single-photon Rydberg excitation of cesium atoms [J]. Chinese Optics, 2019, 12(4): 701-718. (in Chinese) doi: 10.3788/co.20191204.0701 [2] Shi J K, Wang G M, Ji R Y, et al. Compact dual-wavelength continuous-wave Er-doped fiber laser [J]. Chinese Optics, 2019, 12(4): 810-819. (in Chinese) doi: 10.3788/co.20191204.0810 [3] Jiang S, Sun D S, Han Y L, et al. Design and test of laser anemometer based on continuous wave coherence detection [J]. Infrared and Laser Engineering, 2019, 48(12): 1203008. (in Chinese) doi: 10.3788/IRLA201948.1203008 [4] Mayilamu M, Yao J Q, Wang P. Laser diode-end-pumped Nd: YAG/LBO laser operating at 946 nm/473 nm [J]. Infrared and Laser Engineering, 2013, 42(11): 2931-2934. (in Chinese) [5] Gao J. Tunable mode-locked fiber laser pumped supercontinuum source [J]. Optics & Precision Engineering, 2018, 026(1): 25-30. (in Chinese) [6] Nie W, Xu Z Y, Kan R F, et al. Measurement of low water vapor dew-point temperature based on tunable diode laser absorption spectroscopy [J]. Optics & Precision Engineering, 2018, 26(8): 32-39. (in Chinese) [7] Walling J C, Peterson O, Morris R, et al. Tunable CW alexandrite laser [J]. IEEE J of Quantum Electron, 1980, 16(2): 120-121. doi: 10.1109/JQE.1980.1070451 [8] Hu S, Yang C S, Chang S L, et al. Efficacy and safety of the picosecond 755-nm alexandrite laser for treatment of dermal pigmentation in Asians—a retrospective study [J]. Lasers in Medical Science, 2020, 35(6): 1377-1383. doi: 10.1007/s10103-020-02959-7 [9] Munk A, Jungbluth B, Strotkamp M, et al. Diode-pumped alexandrite ring laser in single-longitudinal mode operation for atmospheric lidar measurements [J]. Optics Express, 2018, 26(12): 14928. doi: 10.1364/OE.26.014928 [10] Strotkamp M, Munk A, Jungbluth B, et al. Diode-pumped Alexandrite laser for next generation satellite-based earth observation lidar [J]. CEAS Space Journal, 2019, 11: 413-422. doi: 10.1007/s12567-019-00253-z [11] Peng X, Marrakchi A, Walling J C, et al. Watt-level red and UV output from a CW diode array-pumped tunable alexandrite laser [C]//CLEO. Conference on Lasers and Electro-Optics. 2005, 1: 479-481. [12] Barnes N P, Johnson T M, Gettemy D J. Tunable near ultraviolet laser system from a frequency doubled Alexandrite laser [J]. IEEE J Quantum Electron, 1983, 19(9): 1437-1442. doi: 10.1109/JQE.1983.1072042 [13] Walling J C, Heller D, Samelson H, et al. Tunable alexandrite lasers: Development and performance [J]. IEEE J Quantum Electron, 1985, 21(10): 1568-1581. doi: 10.1109/JQE.1985.1072544 [14] Lai S T, Shand M L. High efficiency cw laser‐pumped tunable alexandrite laser [J]. J Appl Phys, 1983, 54(10): 5642-5644. doi: 10.1063/1.331826 [15] Scheps R, Myers J F, Glesne T R, et al. Monochromatic end-pumped operation of an alexandrite laser [J]. Opt Commun, 1993, 97(5): 363-366. [16] Ghanbari S, Major A. High power continuous-wave Alexandrite laser with green pump [J]. Laser Phys, 2016, 26(7): 075001. [17] Arbabzadah E A, Damzen M J. Fibre-coupled red diode-pumped Alexandrite TEM00 laser with single and double-pass end-pumping [J]. Laser Phys Lett, 2016, 13(6): 065002. doi: 10.1088/1612-2011/13/6/065002 [18] Teppitaksak A, Minassian A, Thomas G M, et al. High efficiency >26 W diode end-pumped Alexandrite laser [J]. Opt Express, 2014, 22(13): 16386. doi: 10.1364/OE.22.016386 [19] Kerridge-Johns W R, Damzen M J. Temperature effects on tunable cw Alexandrite lasers under diode end-pumping [J]. Opt Express, 2018, 26(6): 7771. doi: 10.1364/OE.26.007771 [20] Sheng X, Tawy G, Sathian J, et al. Unidirectional single-frequency operation of a continuous-wave Alexandrite ring laser with wavelength tunability [J]. Opt Express, 2018, 26(24): 31129. doi: 10.1364/OE.26.031129 [21] Damzen M J, Thomas G M, Minassian A. Diode-side-pumped Alexandrite slab lasers [J]. Opt Express, 2017, 25(10): 11622. doi: 10.1364/OE.25.011622
Continuous-wave Alexandrite laser pumped by 638 nm and 532 nm lasers
doi: 10.3788/IRLA20200217
- 收稿日期: 2020-06-08
- 修回日期: 2020-07-15
- 网络出版日期: 2021-05-12
- 刊出日期: 2021-03-15
摘要: 报道了一种高功率、高光束质量的755 nm连续波翠绿宝石激光器。首先,对比研究了638 nm激光二极管(LDs)和532 nm固体激光器单端泵浦的翠绿宝石激光器。当638 nm LDs作为泵浦源时,得到的连续输出功率、光-光转换效率分别为3.9 W和19.7%。保持其他条件基本不变,将泵浦源换成532 nm激光器,得到的连续输出功率、光-光转换效率分别为2.1 W和10.0%。结果表明利用 638 nm LDs泵浦翠绿宝石可获得更高的激光功率和转换效率。此外,研究了638 nm LDs双端泵浦的翠绿宝石激光器,在755 nm处得到了6.2 W的连续输出功率,相应的光-光转换效率和斜效率分别为16.3%和24.2%,并且连续输出功率为5.0 W时的光束质量M2优于1.47,这是翠绿宝石激光器在近衍射极限下的最高连续输出功率。这种高功率、高光束质量的755 nm翠绿宝石激光器为连续波紫外激光器的研制提供了良好、稳定的基频源。
English Abstract
Continuous-wave Alexandrite laser pumped by 638 nm and 532 nm lasers
- Received Date: 2020-06-08
- Rev Recd Date: 2020-07-15
- Available Online: 2021-05-12
- Publish Date: 2021-03-15
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Keywords:
- Alexandrite /
- continuous-wave /
- end-pumping /
- laser diode
Abstract: A high power 755 nm continuous-wave (CW) laser with high beam quality based on the Alexandrite crystal was demonstrated. The Alexandrite lasers single-end-pumped by 638 nm laser diodes (LDs) and 532 nm solid-state laser were studied comparatively, then the CW output power, optical-to-optical conversion efficiency, and slope efficiency pumped by 638 nm LDs were 3.9 W, 19.7%, and 23.7%, respectively, while they were 2.1 W, 10.0%, and 12.9%, at nearly the same conditions except that it was pumped by 532 nm solid-state laser. The results show that the Alexandrite laser pumped with 638 nm LDs can obtain higher CW output power and higher conversion efficiency. Moreover, a CW output power of 6.2 W at 755 nm of Alexandrite laser double-end-pumped by a 638 nm LDs was achieved with the optical-to-optical conversion efficiency and the slope efficiency of 16.3% and 24.2%, respectively. The beam quality factor M2 was better than 1.47 at the CW output power of 5.0 W, which was the highest CW output power of Alexandrite laser with the diffraction limit to the best. This high power and high beam quality 755 nm Alexandrite laser provides the fundamental frequency source for the development of CW ultraviolet lasers.