Femtosecond OPO based on MgO:PPLN synchronously pumped by a 532 nm fiber laser

Cao, Jianjun; Shen, Dongyi; Zheng, Yuanlin; Feng, Yaming; Kong, Yan; Wan, Wenjie

doi:10.1088/1555-6611/aa637b

Cited by 6 publications

(4 citation statements)

References 18 publications

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“…Visible femtosecond lasers stand as pivotal light sources, offering distinct advantages in special material precision processing, high-resolution fluorescence microscopy, optical atomic clocks, and other applications 15 – 19 Generation of visible femtosecond lasers was predominantly based on Ti:sapphire femtosecond oscillators 20 or harnessing the nonlinear frequency conversion (e.g., frequency doubling, 21 sum frequency, 22 and optical parametric process 23 ) until recently. Ti:sapphire femtosecond oscillators and parametric amplifiers are renowned for their capability of producing high-performance femtosecond lasers, as well as notorious for high costs, intricate maintenance requirements, and unwieldy dimensions.…”

Section: Introductionmentioning

confidence: 99%

635 nm femtosecond fiber laser oscillator and amplifier

Zou,

Ruan,

Chen

et al. 2024

Adv. Photon. Nexus

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Although visible femtosecond lasers based on nonlinear frequency conversion of Ti:sapphire femtosecond oscillators or near-infrared ultrafast lasers have been well developed, limitations in terms of footprint, cost, and efficiency have called for alternative laser solutions. The fiber femtosecond mode-locked oscillator as an ideal solution has achieved great success in the 0.9 to 3.5 μm infrared wavelengths, but remains an outstanding challenge in the visible spectrum (390 to 780 nm). Here, we tackle this challenge by introducing a visible-wavelength mode-locked femtosecond fiber oscillator along with an amplifier. This fiber femtosecond oscillator emits red light at 635 nm, employs a figure-nine cavity configuration, applies a double-clad Pr 3þ -doped fluoride fiber as the visible gain medium, incorporates a visible-wavelength phase-biased nonlinear amplifying loop mirror (PB-NALM) for mode locking, and utilizes a pair of customized high-efficiency and high-groove-density diffraction gratings for dispersion management. Visible self-starting mode locking established by the PB-NALM directly yields red laser pulses with a minimum pulse duration of 196 fs and a repetition rate of 53.957 MHz from the oscillator. Precise control of the grating pair spacing can switch the pulse state from a dissipative soliton or a stretched-pulse soliton to a conventional soliton. In addition, a chirped-pulse amplification system built alongside the oscillator immensely boosts the laser performance, resulting in an average output power over 1 W, a pulse energy of 19.55 nJ, and a dechirped pulse duration of 230 fs. Our result represents a concrete step toward high-power femtosecond fiber lasers covering the visible spectral region and could have important applications in industrial processing, biomedicine, and scientific research.

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Section: Introductionmentioning

confidence: 99%

635 nm femtosecond fiber laser oscillator and amplifier

Zou,

Ruan,

Chen

et al. 2024

Adv. Photon. Nexus

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“…The three most popular tuning techniques for PPLT OPOs are angle, temperature, and periodic tuning. The commonly used PPLT crystals include singleperiod, multi-period, mix-period, and fan-out crystals [10][11][12]. Single-period crystals have only one fixed period.…”

Section: Introductionmentioning

confidence: 99%

High-efficiency broad-linewidth widely-tunable mid-infrared OPO based on fan-out PPLT

Liu¹,

Ye²,

Zhang³

et al. 2023

Laser Phys.

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We reported a high-efficiency, broad-linewidth, wide-tuning-range singly-resonated optical parametric oscillator (OPO) based on a fan-out PPLT crystal. When the PPLT crystal was operated at 120 °C and pumped by Q-switched 1064 nm laser at 14.17 W with a circular pump profile, the overall output power of OPO was 7.22 W (η = 50.4%) for both the signal and idler waves. The central wavelength and linewidth of the mid-infrared (MIR) laser were 3770 nm and ∼40 nm. A wavelength tuning range of 3538–3941 nm was accomplished by adjusting the crystal period through simple mechanical movement. Due to the larger coverage of gratings with an elliptical pump profile, the output linewidth of the MIR laser was further broadened to ∼100 nm, which is ten times more than other non-fan-out PPLT OPOs. Both pumping methods with different profiles were operated at 30 kHz, 49.2 ns for the 1064 nm laser, the power fluctuation of the obtained MIR laser was within 3.5%.

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“…Unfortunately, the signal pulse energy was lower than 1.0 nJ. [18] In this letter, we propose a novel green pumped ps SPOPO concept with multi-tens of microjoule of burst energy at the tens of kHz. Here, an OPO was synchronously pumped internal in a second harmonic (SH) cavity, the green SH pulse was produced by a ps 1-µm laser.…”

Section: Introductionmentioning

confidence: 99%

A 45-μJ, 10-kHz, burst-mode picosecond optical parametric oscillator synchronously pumped at a second harmonic cavity

Ma¹,

Liu²,

Yang³

et al. 2022

Chinese Phys. B

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A novel picosecond (ps) optical parametric oscillator (OPO) with high energy was developed by placing the OPO in a second harmonic (SH) cavity. In a proof-of-principle experiment, we have demonstrated an unprecedented 45 μJ burst energy of the OPO signal at 900 nm, operating at a pulse repetition rate of 10 kHz with a pulse width of 46.8 ps. The beam quality factor M2 was measured to be Mx 2=1.44 in the x direction and My 2=1.40 in the y direction, corresponding to an average beam factor M2=1.42. To the best of our knowledge, this study is the first report on high energy ps OPO synchronously pumped intracavity at a SH resonator.

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Femtosecond OPO based on MgO:PPLN synchronously pumped by a 532 nm fiber laser

Cited by 6 publications

References 18 publications

635 nm femtosecond fiber laser oscillator and amplifier

635 nm femtosecond fiber laser oscillator and amplifier

High-efficiency broad-linewidth widely-tunable mid-infrared OPO based on fan-out PPLT

A 45-μJ, 10-kHz, burst-mode picosecond optical parametric oscillator synchronously pumped at a second harmonic cavity

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