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Wang W, Pu T, Wu H, Li Y, Wang R, Sun B, Liang H. High-power Yb:CALGO regenerative amplifier and 30 fs output via multi-plate compression. OPTICS EXPRESS 2022; 30:22153-22160. [PMID: 36224921 DOI: 10.1364/oe.460004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Accepted: 05/25/2022] [Indexed: 06/16/2023]
Abstract
The pulse energy and average power are two long-sought parameters of femtosecond lasers. In the fields of nonlinear-optics and strong-field physics, they respectively play the role to unlock the various nonlinear processes and provide enough photon fluxes. In this paper, a high-energy and high-power Yb:CALGO regenerative amplifier with 120 fs pulse width is reported. This high-performance regenerative amplifier can work with high stability in a large tuning range of repetition rates. Varying the repetition rate from 3 to 180 kHz, the maximum output power of 36 W and the pulse energy up to 4.3 mJ, corresponding to a peak power of more than 20 GW are demonstrated. The output beam is near diffraction limited with M2 = 1.09 and 1.14 on the horizontal and vertical directions, respectively. In addition, multi-plate compression is employed to achieve 30 fs output with 23 W average power which is attractive for applications such as high-harmonic generation.
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Abstract
Yb:CaGdAlO4, or Yb:CALGO, a new laser crystal, has been attracting increasing attention recently in a myriad of laser technologies. This crystal features salient thermal, spectroscopic and mechanical properties, which enable highly efficient and safe generation of continuous-wave radiations and ultrafast pulses with ever short durations. More specifically, its remarkable thermal-optic property and its high conversion efficiency allow high-power operation. Its high nonlinear coefficient facilitates study of optimized mode locking lasers. Besides, its ultrabroad and flat-top emission band benefits the generation of complex structured light with outstanding tunability. In this paper, we review the recent advances in the study of Yb:CALGO, covering its physical properties as well as its growing applications in various fields and prospect for future development.
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Zhao L, Yuan Y, Tong L, Zhang W, Zhang Z, Ning T, Cai Y, Gao Y. Passively Q-Switched Yb:CALGO Laser Based on Mo:BiVO 4 Absorber. NANOMATERIALS 2021; 11:nano11092364. [PMID: 34578679 PMCID: PMC8464999 DOI: 10.3390/nano11092364] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 09/03/2021] [Accepted: 09/08/2021] [Indexed: 11/16/2022]
Abstract
A stable, passively Q-switched Yb:CaGdAlO4 laser based on Mo:BiVO4 saturable absorber was demonstrated. Close observations of the structure and morphology of the nanoparticles by using transmission electron microscope, Raman spectrum and linear absorption were measured. The nonlinear transmission of Mo:BiVO4 was characterized by a 30 ps laser with a central wavelength of 1064 nm and a repetition rate of 10 Hz. The experimental maximum output power of the pulsed laser was 510 mW with a repetition rate of 87 kHz and pulse width of 3.18 μs, corresponding to a peak power of 1.84 W and a single pulse energy of 5.8 μJ. The experimental results indicate that Mo:BiVO4-SA is a great candidate for passively Q-switched lasers in the near infrared region.
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Affiliation(s)
- Lina Zhao
- College of Physics and Electronics, Center of Light Manipulations and Applications, Shandong Normal University, No 88, East Wenhua Road, Jinan 250014, China; (L.Z.); (Y.Y.); (L.T.); (W.Z.); (Z.Z.); (T.N.)
- Shandong Provincial Key Laboratory of Optics and Photonic Device, No 88, East Wenhua Road, Jinan 250014, China
| | - Ye Yuan
- College of Physics and Electronics, Center of Light Manipulations and Applications, Shandong Normal University, No 88, East Wenhua Road, Jinan 250014, China; (L.Z.); (Y.Y.); (L.T.); (W.Z.); (Z.Z.); (T.N.)
| | - Luyang Tong
- College of Physics and Electronics, Center of Light Manipulations and Applications, Shandong Normal University, No 88, East Wenhua Road, Jinan 250014, China; (L.Z.); (Y.Y.); (L.T.); (W.Z.); (Z.Z.); (T.N.)
| | - Wenyu Zhang
- College of Physics and Electronics, Center of Light Manipulations and Applications, Shandong Normal University, No 88, East Wenhua Road, Jinan 250014, China; (L.Z.); (Y.Y.); (L.T.); (W.Z.); (Z.Z.); (T.N.)
| | - Zhongshuai Zhang
- College of Physics and Electronics, Center of Light Manipulations and Applications, Shandong Normal University, No 88, East Wenhua Road, Jinan 250014, China; (L.Z.); (Y.Y.); (L.T.); (W.Z.); (Z.Z.); (T.N.)
| | - Tingyin Ning
- College of Physics and Electronics, Center of Light Manipulations and Applications, Shandong Normal University, No 88, East Wenhua Road, Jinan 250014, China; (L.Z.); (Y.Y.); (L.T.); (W.Z.); (Z.Z.); (T.N.)
- Shandong Provincial Key Laboratory of Optics and Photonic Device, No 88, East Wenhua Road, Jinan 250014, China
| | - Yangjian Cai
- College of Physics and Electronics, Center of Light Manipulations and Applications, Shandong Normal University, No 88, East Wenhua Road, Jinan 250014, China; (L.Z.); (Y.Y.); (L.T.); (W.Z.); (Z.Z.); (T.N.)
- Shandong Provincial Key Laboratory of Optics and Photonic Device, No 88, East Wenhua Road, Jinan 250014, China
- School of Physical Science and Technology, Soochow University, Suzhou 215006, China
- Correspondence: (Y.C.); (Y.G.)
| | - Yuanmei Gao
- College of Physics and Electronics, Center of Light Manipulations and Applications, Shandong Normal University, No 88, East Wenhua Road, Jinan 250014, China; (L.Z.); (Y.Y.); (L.T.); (W.Z.); (Z.Z.); (T.N.)
- Shandong Provincial Key Laboratory of Optics and Photonic Device, No 88, East Wenhua Road, Jinan 250014, China
- Correspondence: (Y.C.); (Y.G.)
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Gao P, Lin H, Li J, Guo J, Yu H, Zhang H, Liang X. Megahertz-level, high-power picosecond Nd:LuVO 4 regenerative amplifier free of period doubling. OPTICS EXPRESS 2016; 24:13963-13970. [PMID: 27410559 DOI: 10.1364/oe.24.013963] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report on a high repetition rate, high-power picosecond Nd:LuVO4 regenerative amplifier. Period doubling caused energy instability was eliminated at megahertz-level repetition rate with the modified seeding source. A multi-pass cell was used to improve the seed pulse energy to achieve complete suppression of the onset of bifurcation. At a maximum repetition rate of 1.43 MHz, the system produced 7.0-ps-long pulses with an average output power of 25.1 W, corresponding to a pulse energy of 17.6 μJ. At 100 kHz, the pulse energy increased to 205 μJ with an average power of 20.5 W. Moreover, the injected pulses with pulse duration of 5.1 ps broadened to 8.9 ps because of gain narrowing in the amplifier.
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Pirzio F, Kemnitzer M, Guandalini A, Kienle F, Veronesi S, Tonelli M, Aus der Au J, Agnesi A. Ultrafast, solid-state oscillators based on broadband, multisite Yb-doped crystals. OPTICS EXPRESS 2016; 24:11782-11792. [PMID: 27410103 DOI: 10.1364/oe.24.011782] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A detailed performance comparison of new interesting Yb-doped crystals in the same oscillator setup, with single-mode fiber-coupled diode laser pump is reported. We intended to assess the shortest pulses achievable with available SESAM technology, running a fair comparison with laser crystals Yb:KLuW, Yb:SSO, Yb:CALGO, Yb:CALYO and Yb:CaF2, very likely including the most promising choices for the next generation of commercial bulk ultrafast solid-state systems.
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Pouysegur J, Weichelt B, Guichard F, Zaouter Y, Hönninger C, Mottay E, Druon F, Georges P. Simple Yb:YAG femtosecond booster amplifier using divided-pulse amplification. OPTICS EXPRESS 2016; 24:9896-9904. [PMID: 27137601 DOI: 10.1364/oe.24.009896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A hybrid-system approach using a low-gain Yb:YAG single crystal booster amplifier behind a state-of-the-art industrial high-power femtosecond fiber system is studied to significantly increase the output pulse energy of the fiber amplifier. With this system, more than 60 W of average power is demonstrated at 100 kHz for pulse duration of 400 fs, corresponding to an energy per pulse of 600 µJ. Reducing the repetition rate, the energy is increased up to 2.5 mJ (before compression), which corresponds to the limitation due to laser damage threshold of the optical coatings. To scale further the energy, passive divided-pulse amplification is then implemented at the entrance of the bulk amplifier. Using this geometry, a safe nominal operating point is presented with output pulse energies of 3 mJ before and 2.3 mJ after compression and with a pulse duration of 520 fs, corresponding to a peak power of 4.4 GW.
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Caracciolo E, Kemnitzer M, Rumpel M, Guandalini A, Pirzio F, Kienle F, Graf T, Abdou Ahmed M, Aus der Au J, Agnesi A. Single-grating-mirror intracavity stretcher design for chirped pulse regenerative amplification. OPTICS LETTERS 2015; 40:1532-1535. [PMID: 25831377 DOI: 10.1364/ol.40.001532] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report for the first time, to the best of our knowledge, an innovative design concept for intracavity pulse stretching in a regenerative amplifier, employing a single "grating-mirror" based on a leaky-mode grating-waveguide design. The very compact and flexible layout allows for femtosecond pulses to be in principle easily stretched up to nanosecond durations. The design has been tested in a diode-pumped Yb:CALGO regenerative amplifier followed by a standard transmission grating compressor. Sub-200-fs pulses (stretched pulses ≈110 ps) with 205-μJ energy at 20-kHz repetition rate have been demonstrated. In order to prove the robustness and potential for energy scaling of leaky-mode grating-waveguide intracavity stretcher, we generated stretched pulses with energies of up to ≈700 μJ (400-ps long) at a lower repetition rate of 10 kHz. A simple model is proposed for the study of the cavity in presence of induced spatial chirp.
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