YLF Lasers

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Xinlu Zhang - One of the best experts on this subject based on the ideXlab platform.

  • bistable performances of diode end pumped quasi three level tm ho YLF Lasers
    Optics Communications, 2010
    Co-Authors: Xinlu Zhang, Li Li, Y L Ju, Liang Yang, Y Z Wang
    Abstract:

    The performances of continuous wave, quasi-three-level Tm,Ho:YLF Lasers emitting near 2.06 μm with single- and dual-end-pumped configurations are reported. Bistability is observed for single-end pumping but is absent for dual-end pumping. The width of the bistability region and the jump power at the turning point are shown to be functions of both the cavity length and output coupler transmission.

  • formation mechanism of optical bistability in end pumped quasi three level tm ho YLF Lasers
    Journal of The Optical Society of America B-optical Physics, 2009
    Co-Authors: Xinlu Zhang, Li Li, Yang Zheng, Y Z Wang
    Abstract:

    We report on optical bistability and its formation mechanism in an end-pumped quasi-three-level 2 μm Tm,Ho:YLF laser with only a bulk laser crystal. We have experimentally observed that the characteristic output versus input curve is not linear and shows bistability when the laser crystal is singly end pumped by a 792 nm laser diode. The width of the bistable region is 1.6 W and the jump power at the turning point is 82.5 mW. However, the laser shows linear output when the laser crystal is dual end pumped. The formation mechanism of optical bistability is explained by solving coupled rate equations in which energy transfer upconversion and ground-state reabsorption are considered.

  • single longitudinal mode and optical bistability tm ho YLF Lasers at room temperature
    Laser Physics Letters, 2009
    Co-Authors: Xinlu Zhang, Li Li, Y L Ju, Bo Jiang, Y Z Wang
    Abstract:

    In this paper we report on laser diode end-pumped single longitudinal mode and optical bistability Tm,Ho:YLF Lasers at room temperature. The maximal output power of single longitudinal mode can reach 106 mW by using only a 250 μm thick solid etalon. The single longitudinal mode laser can be used as a seed laser for laser lidar systems. Furthermore, for the first time, the phenomenon of low threshold optical bistability of Tm,Ho:YLF laser at room temperature is observed.

  • the effects of energy transfer upconversion on end pumped q switched tm ho YLF Lasers
    Journal of Physics D, 2009
    Co-Authors: Xinlu Zhang, Y Z Wang, Li Li, Y L Ju, Yufeng Peng
    Abstract:

    Based on the model of continuous wave end-pumped quasi-three-level system, the influence of energy transfer upconversion (ETU) on diode-end-pumped actively Q-switched Tm, Ho : YLF Lasers is investigated by the rate equation analysis. The analytical expressions of the fractional thermal loading and the pulse energy are obtained. The influences of ETU on the fractional thermal loading and the output pulse energy are analysed. The theoretical results show that the ETU reduces not only the pulse energy but also the effective upper level lifetime of the actively Q-switched Tm, Ho : YLF laser. The practical example of the diode-end-pumped Q-switched Tm, Ho : YLF laser has been used to verify the present model.

  • The effects of energy transfer upconversion on end-pumped Q-switched Tm, Ho?:?YLF Lasers
    Journal of Physics D, 2008
    Co-Authors: Xinlu Zhang, Li Li, Yuezhu Wang, Youlun Ju, Yufeng Peng
    Abstract:

    Based on the model of continuous wave end-pumped quasi-three-level system, the influence of energy transfer upconversion (ETU) on diode-end-pumped actively Q-switched Tm, Ho : YLF Lasers is investigated by the rate equation analysis. The analytical expressions of the fractional thermal loading and the pulse energy are obtained. The influences of ETU on the fractional thermal loading and the output pulse energy are analysed. The theoretical results show that the ETU reduces not only the pulse energy but also the effective upper level lifetime of the actively Q-switched Tm, Ho : YLF laser. The practical example of the diode-end-pumped Q-switched Tm, Ho : YLF laser has been used to verify the present model.

Y Z Wang - One of the best experts on this subject based on the ideXlab platform.

  • high power ho yag laser pumped by two orthogonally polarized tm YLF Lasers
    Optical and Quantum Electronics, 2015
    Co-Authors: Yingjie Shen, Y L Ju, Chuanpeng Qian, Xiaoming Duan, Y Z Wang
    Abstract:

    High efficient and high power 2 \(\upmu \)m room temperature Ho:YAG laser resonantly dual-end-pumped by two orthogonally polarized diode-pumped Tm:YLF Lasers at 1.91 \(\upmu \)m was demonstrated. A maximum continuous wave output power of 61.9 W was generated, corresponding to the slope efficiency of 63.9 % with respect to the incident pump power and optical-to-optical conversion efficiency of 59.9 %. At 20 kHz of the pulsed repetition frequency, we achieved a less than 25 ns FWHM pulse, with the maximum output energy per pulse of 2.84 mJ as well as a peak power of approximately 113.6 kW. A beam quality of \(M^{2}<\)1.6 was achieved.

  • bistable performances of diode end pumped quasi three level tm ho YLF Lasers
    Optics Communications, 2010
    Co-Authors: Xinlu Zhang, Li Li, Y L Ju, Liang Yang, Y Z Wang
    Abstract:

    The performances of continuous wave, quasi-three-level Tm,Ho:YLF Lasers emitting near 2.06 μm with single- and dual-end-pumped configurations are reported. Bistability is observed for single-end pumping but is absent for dual-end pumping. The width of the bistability region and the jump power at the turning point are shown to be functions of both the cavity length and output coupler transmission.

  • formation mechanism of optical bistability in end pumped quasi three level tm ho YLF Lasers
    Journal of The Optical Society of America B-optical Physics, 2009
    Co-Authors: Xinlu Zhang, Li Li, Yang Zheng, Y Z Wang
    Abstract:

    We report on optical bistability and its formation mechanism in an end-pumped quasi-three-level 2 μm Tm,Ho:YLF laser with only a bulk laser crystal. We have experimentally observed that the characteristic output versus input curve is not linear and shows bistability when the laser crystal is singly end pumped by a 792 nm laser diode. The width of the bistable region is 1.6 W and the jump power at the turning point is 82.5 mW. However, the laser shows linear output when the laser crystal is dual end pumped. The formation mechanism of optical bistability is explained by solving coupled rate equations in which energy transfer upconversion and ground-state reabsorption are considered.

  • single longitudinal mode and optical bistability tm ho YLF Lasers at room temperature
    Laser Physics Letters, 2009
    Co-Authors: Xinlu Zhang, Li Li, Y L Ju, Bo Jiang, Y Z Wang
    Abstract:

    In this paper we report on laser diode end-pumped single longitudinal mode and optical bistability Tm,Ho:YLF Lasers at room temperature. The maximal output power of single longitudinal mode can reach 106 mW by using only a 250 μm thick solid etalon. The single longitudinal mode laser can be used as a seed laser for laser lidar systems. Furthermore, for the first time, the phenomenon of low threshold optical bistability of Tm,Ho:YLF laser at room temperature is observed.

  • the effects of energy transfer upconversion on end pumped q switched tm ho YLF Lasers
    Journal of Physics D, 2009
    Co-Authors: Xinlu Zhang, Y Z Wang, Li Li, Y L Ju, Yufeng Peng
    Abstract:

    Based on the model of continuous wave end-pumped quasi-three-level system, the influence of energy transfer upconversion (ETU) on diode-end-pumped actively Q-switched Tm, Ho : YLF Lasers is investigated by the rate equation analysis. The analytical expressions of the fractional thermal loading and the pulse energy are obtained. The influences of ETU on the fractional thermal loading and the output pulse energy are analysed. The theoretical results show that the ETU reduces not only the pulse energy but also the effective upper level lifetime of the actively Q-switched Tm, Ho : YLF laser. The practical example of the diode-end-pumped Q-switched Tm, Ho : YLF laser has been used to verify the present model.

Li Li - One of the best experts on this subject based on the ideXlab platform.

  • single frequency optical bistability operation in end pumped tm ho YLF Lasers
    Applied Physics B, 2012
    Co-Authors: X L Zhang, Li Li, M Li, Jiaqun Zhao
    Abstract:

    Single-frequency bistability performances from a Tm,Ho:YLF laser with two Fabry–Perot etalons near room temperature is reported. For the first time to our knowledge, the single-frequency bistability at 2.05 μm is displayed in the laser operation with the bistable region width of 0–580 mW and the jump power of 0–78 mW, which can be tuned by regulating the length of the laser resonator. The maximum single frequency output power of 180 mW is obtained at the pump power of 2 W, and the laser frequency can be continuously tuned 1.25 GHz. The single frequency bistability laser can be used in laser lidar systems and all-optical switching systems.

  • bistable performances of diode end pumped quasi three level tm ho YLF Lasers
    Optics Communications, 2010
    Co-Authors: Xinlu Zhang, Li Li, Y L Ju, Liang Yang, Y Z Wang
    Abstract:

    The performances of continuous wave, quasi-three-level Tm,Ho:YLF Lasers emitting near 2.06 μm with single- and dual-end-pumped configurations are reported. Bistability is observed for single-end pumping but is absent for dual-end pumping. The width of the bistability region and the jump power at the turning point are shown to be functions of both the cavity length and output coupler transmission.

  • formation mechanism of optical bistability in end pumped quasi three level tm ho YLF Lasers
    Journal of The Optical Society of America B-optical Physics, 2009
    Co-Authors: Xinlu Zhang, Li Li, Yang Zheng, Y Z Wang
    Abstract:

    We report on optical bistability and its formation mechanism in an end-pumped quasi-three-level 2 μm Tm,Ho:YLF laser with only a bulk laser crystal. We have experimentally observed that the characteristic output versus input curve is not linear and shows bistability when the laser crystal is singly end pumped by a 792 nm laser diode. The width of the bistable region is 1.6 W and the jump power at the turning point is 82.5 mW. However, the laser shows linear output when the laser crystal is dual end pumped. The formation mechanism of optical bistability is explained by solving coupled rate equations in which energy transfer upconversion and ground-state reabsorption are considered.

  • single longitudinal mode and optical bistability tm ho YLF Lasers at room temperature
    Laser Physics Letters, 2009
    Co-Authors: Xinlu Zhang, Li Li, Y L Ju, Bo Jiang, Y Z Wang
    Abstract:

    In this paper we report on laser diode end-pumped single longitudinal mode and optical bistability Tm,Ho:YLF Lasers at room temperature. The maximal output power of single longitudinal mode can reach 106 mW by using only a 250 μm thick solid etalon. The single longitudinal mode laser can be used as a seed laser for laser lidar systems. Furthermore, for the first time, the phenomenon of low threshold optical bistability of Tm,Ho:YLF laser at room temperature is observed.

  • theoretical and experimental investigation of optical bistability in end pumped tm ho YLF Lasers
    2009
    Co-Authors: Zhang Xinlu, Li Li, Wang Yuezhu, Ju Youlun, Jiang Bo
    Abstract:

    We demonstrate the strong optical bistability of a 2μm continuous wave Tm,Ho:YLF laser end pumped by a 792nm fiber-coupled laser diode. The quasi-three-level rate equation theoretical model is given under consideration of the energy transfer upconversion and ground state reabsorption effects. The bistable output of Tm,Ho:YLF laser is predicted theoretically by solving the coupled rate equations and the mechanism of the bistability output is analyzed. The bistable output is also studied experimentally. When the laser crystal is at 253K,the width of the bistable region is 1.6W and the jump power at the tujump point is 82.5mW. The theoretical results are in agreement with the experimental results,showing that the theoretical model is reasonable.

Y L Ju - One of the best experts on this subject based on the ideXlab platform.

  • high power ho yag laser pumped by two orthogonally polarized tm YLF Lasers
    Optical and Quantum Electronics, 2015
    Co-Authors: Yingjie Shen, Y L Ju, Chuanpeng Qian, Xiaoming Duan, Y Z Wang
    Abstract:

    High efficient and high power 2 \(\upmu \)m room temperature Ho:YAG laser resonantly dual-end-pumped by two orthogonally polarized diode-pumped Tm:YLF Lasers at 1.91 \(\upmu \)m was demonstrated. A maximum continuous wave output power of 61.9 W was generated, corresponding to the slope efficiency of 63.9 % with respect to the incident pump power and optical-to-optical conversion efficiency of 59.9 %. At 20 kHz of the pulsed repetition frequency, we achieved a less than 25 ns FWHM pulse, with the maximum output energy per pulse of 2.84 mJ as well as a peak power of approximately 113.6 kW. A beam quality of \(M^{2}<\)1.6 was achieved.

  • bistable performances of diode end pumped quasi three level tm ho YLF Lasers
    Optics Communications, 2010
    Co-Authors: Xinlu Zhang, Li Li, Y L Ju, Liang Yang, Y Z Wang
    Abstract:

    The performances of continuous wave, quasi-three-level Tm,Ho:YLF Lasers emitting near 2.06 μm with single- and dual-end-pumped configurations are reported. Bistability is observed for single-end pumping but is absent for dual-end pumping. The width of the bistability region and the jump power at the turning point are shown to be functions of both the cavity length and output coupler transmission.

  • single longitudinal mode and optical bistability tm ho YLF Lasers at room temperature
    Laser Physics Letters, 2009
    Co-Authors: Xinlu Zhang, Li Li, Y L Ju, Bo Jiang, Y Z Wang
    Abstract:

    In this paper we report on laser diode end-pumped single longitudinal mode and optical bistability Tm,Ho:YLF Lasers at room temperature. The maximal output power of single longitudinal mode can reach 106 mW by using only a 250 μm thick solid etalon. The single longitudinal mode laser can be used as a seed laser for laser lidar systems. Furthermore, for the first time, the phenomenon of low threshold optical bistability of Tm,Ho:YLF laser at room temperature is observed.

  • the effects of energy transfer upconversion on end pumped q switched tm ho YLF Lasers
    Journal of Physics D, 2009
    Co-Authors: Xinlu Zhang, Y Z Wang, Li Li, Y L Ju, Yufeng Peng
    Abstract:

    Based on the model of continuous wave end-pumped quasi-three-level system, the influence of energy transfer upconversion (ETU) on diode-end-pumped actively Q-switched Tm, Ho : YLF Lasers is investigated by the rate equation analysis. The analytical expressions of the fractional thermal loading and the pulse energy are obtained. The influences of ETU on the fractional thermal loading and the output pulse energy are analysed. The theoretical results show that the ETU reduces not only the pulse energy but also the effective upper level lifetime of the actively Q-switched Tm, Ho : YLF laser. The practical example of the diode-end-pumped Q-switched Tm, Ho : YLF laser has been used to verify the present model.

  • influence of energy transfer up conversion on diode end pumped q switched tm ho YLF Lasers
    Fundamental problems of optoelectronics and microelectronics. Conference, 2007
    Co-Authors: Xinlu Zhang, Li Li, Y L Ju, Shenli Yu, M Yuezhu D Wang
    Abstract:

    The influence of energy-transfer up-conversion (ETU) on diode-end-pumped actively Q-switched Tm,Ho:YLF Lasers is investigated by the rate equation analysis. The theoretical results show that the energy-transfer up-conversion reduces not only pulse energy but also effective upper level life. The practical example of the diode-end-pumped Q-switched Tm,Ho:YLF laser has been used to verify the present model.

Alphan Sennaroglu - One of the best experts on this subject based on the ideXlab platform.

  • low threshold diode pumped 2 3 mu m tm3 YLF Lasers
    IEEE Journal of Selected Topics in Quantum Electronics, 2018
    Co-Authors: Ismail Yorulmaz, Alphan Sennaroglu
    Abstract:

    We demonstrate low-threshold diode-pumped operation of a continuous-wave Tm3+:YLF laser near 2.3 μm and provide a detailed experimental investigation of its lasing characteristics. A narrow-line, tunable Ti3+:sapphire laser was first used to measure the excitation spectrum and investigate the absorption saturation behavior of the 1.5 at.% Tm3+:YLF gain medium. A single-mode, 120-mW laser diode operating at 792 nm was then used as a pump source to demonstrate low-threshold lasing at 2.3 μm. With a 1% output coupler, diode-pumped operation could be obtained with as low as 25 mW of incident threshold pump power. With 119 mW of pump power, as high as 10.5 mW of output power could be obtained at 2305 nm with a slope efficiency of 11.4%. By using a second, 250-mW laser diode, a resonator with variable output coupling was constructed to measure the threshold pump power and power slope efficiency as a function of output coupling. The minimum threshold pump power at output coupling levels approaching 0% was measured to be 4 mW. Results further showed that the slope efficiency decreased with increasing output coupling beyond 0.7%. The stimulated emission cross section at 2305 nm was further determined to be $\text{0.68} \times \text{10}^{ - 20}\;{\text{c}}{{\text{m}}^2}$ from lasing threshold data.

  • Low-Threshold Diode-Pumped 2.3-$\mu$ m Tm3+:YLF Lasers
    IEEE Journal of Selected Topics in Quantum Electronics, 2018
    Co-Authors: Ismail Yorulmaz, Alphan Sennaroglu
    Abstract:

    We demonstrate low-threshold diode-pumped operation of a continuous-wave Tm3+:YLF laser near 2.3 μm and provide a detailed experimental investigation of its lasing characteristics. A narrow-line, tunable Ti3+:sapphire laser was first used to measure the excitation spectrum and investigate the absorption saturation behavior of the 1.5 at.% Tm3+:YLF gain medium. A single-mode, 120-mW laser diode operating at 792 nm was then used as a pump source to demonstrate low-threshold lasing at 2.3 μm. With a 1% output coupler, diode-pumped operation could be obtained with as low as 25 mW of incident threshold pump power. With 119 mW of pump power, as high as 10.5 mW of output power could be obtained at 2305 nm with a slope efficiency of 11.4%. By using a second, 250-mW laser diode, a resonator with variable output coupling was constructed to measure the threshold pump power and power slope efficiency as a function of output coupling. The minimum threshold pump power at output coupling levels approaching 0% was measured to be 4 mW. Results further showed that the slope efficiency decreased with increasing output coupling beyond 0.7%. The stimulated emission cross section at 2305 nm was further determined to be $\text{0.68} \times \text{10}^{ - 20}\;{\text{c}}{{\text{m}}^2}$ from lasing threshold data.

  • Low-Threshold Diode-Pumped 2.3-$\mu$ m Tm3+:YLF Lasers
    IEEE Journal of Selected Topics in Quantum Electronics, 2018
    Co-Authors: Ismail Yorulmaz, Alphan Sennaroglu
    Abstract:

    We demonstrate low-threshold diode-pumped operation of a continuous-wave Tm3+:YLF laser near 2.3 μm and provide a detailed experimental investigation of its lasing characteristics. A narrow-line, tunable Ti3+:sapphire laser was first used to measure the excitation spectrum and investigate the absorption saturation behavior of the 1.5 at.% Tm3+:YLF gain medium. A single-mode, 120-mW laser diode operating at 792 nm was then used as a pump source to demonstrate low-threshold lasing at 2.3 μm. With a 1% output coupler, diode-pumped operation could be obtained with as low as 25 mW of incident threshold pump power. With 119 mW of pump power, as high as 10.5 mW of output power could be obtained at 2305 nm with a slope efficiency of 11.4%. By using a second, 250-mW laser diode, a resonator with variable output coupling was constructed to measure the threshold pump power and power slope efficiency as a function of output coupling. The minimum threshold pump power at output coupling levels approaching 0% was measured to be 4 mW. Results further showed that the slope efficiency decreased with increasing output coupling beyond 0.7%. The stimulated emission cross section at 2305 nm was further determined to be 0.68 × 10-20 cm2 from lasing threshold data.

  • Kerr-lens mode-locked 2.3-μm Tm 3+ :YLF laser as a source of femtosecond pulses in the mid-infrared
    Optics Letters, 2017
    Co-Authors: Ferda Canbaz, Ismail Yorulmaz, Alphan Sennaroglu
    Abstract:

    We report what is to our knowledge a new source of femtosecond pulses in the mid-infrared, based on a Kerr-lens mode-locked (KLM) Tm3+:YLF laser at 2303 nm. An undoped ZnSe substrate was included in the resonator to provide enhanced nonlinear phase modulation during KLM operation. The Tm3+:YLF laser was end-pumped with a continuous-wave Ti3+ : sapphire laser at 780 nm. With 880 mW of pump power, we generated 514-fs pulses at a pulse repetition rate of 41.5 MHz with an average power of 14.4 mW. The spectral width (full width at half-maximum) was measured as 15.4 nm, giving a time-bandwidth product of 0.44. We foresee that the wide availability of this gain medium, as well as the straightforward pumping scheme near 800 nm, will make 2.3-μm, mode-locked Tm3+:YLF Lasers versatile sources of ultrashort pulses in the mid-infrared.