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Li ZQ, Lin ZL, Zeng HJ, Nie HY, Zhang G, Yu F, Zhao X, Liang HC, Petrov V, Loiko P, Mateos X, Wu G, Chen W. Continuous-wave and SESAM mode-locked operation of a Yb:YSr 3(PO 4) 3 laser. OPTICS EXPRESS 2024; 32:3974-3979. [PMID: 38297606 DOI: 10.1364/oe.514073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Accepted: 01/07/2024] [Indexed: 02/02/2024]
Abstract
We report on the continuous-wave (CW) and, for what we believe to be the first time, passively mode-locked (ML) laser operation of an Yb3+-doped YSr3(PO4)3 crystal. Utilizing a 976-nm spatially single-mode, fiber-coupled laser diode as pump source, the Yb:YSr3(PO4)3 laser delivers a maximum CW output power of 333 mW at 1045.8 nm with an optical efficiency of 55.7% and a slope efficiency of 60.9%. Employing a quartz-based Lyot filter, an impressive wavelength tuning range of 97 nm at the zero level was achieved in the CW regime, spanning from 1007 nm to 1104 nm. In the ML regime, incorporating a commercially available semiconductor saturable absorber mirror (SESAM) to initiate and maintain soliton-like pulse shaping, the Yb:YSr3(PO4)3 laser generated pulses as short as 61 fs at 1062.7 nm, with an average output power of 38 mW at a repetition rate of ∼66.7 MHz.
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Fan M, Wu G, Duan X, Li Y, Wang C, Yu F, Zhao X. Preparation and Optical Properties of Nd:Bi 2Ti 2O 7 Laser Crystal with Disordered Structure and Attractive Multiwavelength Emission Characteristics. ACS APPLIED MATERIALS & INTERFACES 2023; 15:46074-46084. [PMID: 37734000 DOI: 10.1021/acsami.3c10468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/23/2023]
Abstract
Laser crystals with multiwavelength emission characteristics are potential light sources for terahertz radiation. Herein, the pure and Nd-doped Bi2Ti2O7 (BTO) laser crystals with sizes up to 16 × 13 × 5 mm3 were successfully grown using the flux method in the KF-B2O3-CaBi4Ti4O15 growth system. The crystal structure, ideal morphology, chemical, mechanical, and thermal properties, optical transmission and Raman spectra, refractive index, absorption, and fluorescence spectra, as well as fluorescence lifetimes, were systematically studied. Besides, the spectral parameters of Nd3+ ions in the BTO crystal were systematically calculated based on the Judd-Ofelt theory. The Nd:BTO crystal has a wide transmittance range (0.44-7.30 μm), a small coefficient of thermal expansion (5.80 × 10-6 K-1), and a large absorption full width at half-maximum (fwhm) (31.2 nm) at around ∼804 nm, making it more potential for use in high-power laser systems. Moreover, fluorescence spectra show four emission peaks at 1054, 1062, 1104, and 1112 nm. The strong multiwavelength emission property makes Nd:BTO a promising laser crystal, serving as a potential light source for terahertz radiation.
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Affiliation(s)
- Mengdi Fan
- Key Laboratory of Laser & Infrared System, Ministry of Education, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Guangda Wu
- Key Laboratory of Laser & Infrared System, Ministry of Education, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Xiulan Duan
- Key Laboratory of Laser & Infrared System, Ministry of Education, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Yanlu Li
- Key Laboratory of Laser & Infrared System, Ministry of Education, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Chun Wang
- Key Laboratory of Laser & Infrared System, Ministry of Education, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Fapeng Yu
- Key Laboratory of Laser & Infrared System, Ministry of Education, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Xian Zhao
- Key Laboratory of Laser & Infrared System, Ministry of Education, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
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Wu J, Huang J, Huang Y, Gong X, Lin Y, Luo Z, Chen Y. Continuous-wave and passively Q-switched pulsed 1.5 µm Er:Yb:Ba 3Gd(PO 4) 3 lasers. OPTICS EXPRESS 2022; 30:38848-38855. [PMID: 36258440 DOI: 10.1364/oe.472438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Accepted: 09/26/2022] [Indexed: 06/16/2023]
Abstract
An eye-safe 1567 nm continuous-wave laser with a maximum output power of 50 mW and a slope efficiency of 21.1% was demonstrated in an Er:Yb:Ba3Gd(PO4)3 crystal. By using a Co2+:MgAl2O4 crystal with an initial transmission of 95% as a saturable absorber, a stable passively Q-switched pulsed laser was also realized in the crystal. The effects of the output coupler transmission and cavity length on pulsed performance were investigated. At an absorbed pump power of 350 mW, a 1541 nm Er:Yb:Ba3Gd(PO4)3 pulsed laser with a repetition frequency of 0.86 kHz, duration of 38 ns, energy of 21.2 µJ, and peak output power of 0.56 kW was obtained.
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Zhao Q, Gao G, Cong Z, Zhang Z, Liu G, Liu Z, Zhang X, Zhao Z. High-repetition-rate, 50-µJ-level, 1064-nm, CPA laser system based on a single-stage double-pass Yb-doped rod-type fiber amplifier. OPTICS EXPRESS 2022; 30:3611-3619. [PMID: 35209615 DOI: 10.1364/oe.449112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Accepted: 01/11/2022] [Indexed: 06/14/2023]
Abstract
A 1064-nm femtosecond fiber chirped pulse amplification (FCPA) laser system based on a single-stage double-pass Yb-doped rod-type photonic crystal fiber (PCF) amplifier was demonstrated with a pulse repetition rate of 500 kHz, which was specially designed for expected conversion efficiency enhancement of a 10.8 eV source. With a series of Yb:fiber power amplifiers, the average output power was boosted to approximately 35 W. Further, using a transmission gratings-based pulse compressor, an average output power of 27.5 W was achieved, corresponding to a pulse energy of 55 µJ and a compression efficiency of 78.6%. The shortest pulse duration was optimized to be 204 fs, which was also accompanied by obvious pedestal. A pulse duration of 336 fs was also obtained when the pulse quality was at a top priority. To the best of our knowledge, this is the first demonstration of high-repetition-rate high-pulse-energy 1064-nm, instead of 1035-nm, femtosecond laser, based on commercially available Yb-doped rod-type PCF amplifier.
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Wu G, Bai L, Yu P, Fan M, Sun L, Li Y, Yu F, Wang Z, Zhao X. Growth, Optical, and Spectroscopic Properties of Pure and Nd 3+-Doped GdSr 3(PO 4) 3 Crystals with Disordered Structure. Inorg Chem 2021; 61:170-177. [PMID: 34847322 DOI: 10.1021/acs.inorgchem.1c02561] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Disordered crystals have attracted immense attention for the generation of ultrashort laser pulses due to their good thermomechanical characteristics and wide emission bandwidths. In this work, a Gd-based orthophosphate crystal, GdSr3(PO4)3, (GSP), and a Nd3+-doped GdSr3(PO4)3 crystal, (Nd:GSP), were obtained by the Czochralski method. The crystal structure, optical properties, electronic band structure, laser damage threshold, and hardness of the GSP crystal were comprehensively investigated. It exhibited a disordered structure due to the random distribution of Sr and Gd atoms in the same Wyckoff site, which caused inhomogeneous spectral broadening. Additionally, it exhibited a short UV absorption cutoff edge (<200 nm), a large band gap (5.81 eV), and a high laser damage threshold (∼1850 MW/cm2). The spectral properties and Judd-Ofelt calculations of the Nd:GSP crystals were analyzed. A wide absorption band at 803 nm, with a full width at half-maximum value of 20 nm, makes the Nd:GSP crystal suitable for the efficient pumping of AlGaAs laser diodes. Sub-100-fs pulses could be supported by its 25 nm emission bandwidth. Hence, the GSP crystal could be a promising disordered crystal laser matrix.
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Affiliation(s)
- Guangda Wu
- State Key Laboratory of Crystal Materials, Center for Optics Research and Engineering, Shandong University, Jinan 250100, P. R. China
| | - Linyu Bai
- State Key Laboratory of Crystal Materials, Center for Optics Research and Engineering, Shandong University, Jinan 250100, P. R. China
| | - Pingzhang Yu
- State Key Laboratory of Crystal Materials, Center for Optics Research and Engineering, Shandong University, Jinan 250100, P. R. China
| | - Mengdi Fan
- Key Laboratory of Laser & Infrared System, Shandong University, Ministry of Education, Qingdao 266237, China
| | - Li Sun
- State Key Laboratory of Crystal Materials, Center for Optics Research and Engineering, Shandong University, Jinan 250100, P. R. China.,Key Laboratory of Laser & Infrared System, Shandong University, Ministry of Education, Qingdao 266237, China
| | - Yanlu Li
- State Key Laboratory of Crystal Materials, Center for Optics Research and Engineering, Shandong University, Jinan 250100, P. R. China
| | - Fapeng Yu
- State Key Laboratory of Crystal Materials, Center for Optics Research and Engineering, Shandong University, Jinan 250100, P. R. China.,Key Laboratory of Laser & Infrared System, Shandong University, Ministry of Education, Qingdao 266237, China
| | - Zhengping Wang
- State Key Laboratory of Crystal Materials, Center for Optics Research and Engineering, Shandong University, Jinan 250100, P. R. China
| | - Xian Zhao
- State Key Laboratory of Crystal Materials, Center for Optics Research and Engineering, Shandong University, Jinan 250100, P. R. China.,Key Laboratory of Laser & Infrared System, Shandong University, Ministry of Education, Qingdao 266237, China
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