Efficient 1 µm Laser Emission of Czochralski-Grown Nd:LGSB Single Crystal

A 5.0-at.% Nd-doped La0.64Gd0.41Sc2.95(BO3)4 (Nd:LGSB) borate laser crystal was successfully grown by the Czochralski method, for the first time to our knowledge. The spectroscopic properties of the grown crystal are discussed and 1 µm laser emission, under end-pumping with a fiber-coupled diode laser at 807 nm, is reported. A c-cut Nd:LGSB medium yielded 1.35 W continuous-wave output power at 0.63 overall optical-to-optical efficiency, with respect to the absorbed pump power, together with the high 0.68 slope efficiency. With an a-cut Nd:LGSB sample, 0.81 W output power at 0.52 optical-to-optical efficiency was obtained. The laser emission performances under quasi-continuous wave pumping are presented as well, for both c-cut and a-cut crystals. Passive Q-switching was investigated with a semiconductor saturable absorber mirror (SESAM). Laser pulses with 2.2 µJ energy and 32.8 ns durations were recorded from a-cut Nd:LGSB. The average output power reached 0.36 W at 1.55 W absorbed pump power. Passive mode-locking with SESAM was achieved in a long Z-type resonator. Ultrashort pulses with 0.19 W average power, 1.63 nJ energy, and 1.43 ps pulse duration, at 118 MHz repetition rate, are demonstrated for the a-cut Nd:LGSB medium.

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High-power thin-disk lasers emitting beams with axially-symmetric polarizations

Nanophotonics ◽

10.1515/nanoph-2021-0606 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Marwan Abdou Ahmed ◽

Frieder Beirow ◽

André Loescher ◽

Tom Dietrich ◽

Danish Bashir ◽

...

Keyword(s):

Continuous Wave ◽

Average Power ◽

Laser Pulses ◽

Femtosecond Laser Pulses ◽

Thin Disk ◽

Axially Symmetric ◽

Radial Polarization ◽

Average Output ◽

Optical Efficiency ◽

Circular Grating

Abstract We present the intracavity generation of beams with radial polarization at an average output power of 750 W and an optical efficiency of 43% from a continuous wave thin-disk laser. Circular grating waveguide output couplers (GWOC) were used to select the radial polarization. The sensitivity of the polarizing function of the GWOC with regards to the fabrication tolerances is also analysed in details with a particular emphasis on the effect of the duty cycle and the geometrical profile of the gratings. Furthermore, we present the conversion of femtosecond laser pulses from linear to azimuthal polarization using a nanograting-based polarization converter. Azimuthally polarized beams with an average power of up to 850 W, a pulse duration of 400 fs and a pulse repetition rate of 1 MHz were generated in this way with a conversion efficiency of >90%.

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Ytterbium-doped large-core fiber laser with 1 kW continuous-wave output power

Advanced Solid-State Photonics ◽

10.1364/assp.2004.pdp13 ◽

2004 ◽

Cited By ~ 6

Author(s):

Y. Jeong ◽

J. K. Sahu ◽

D. N. Payne ◽

J. Nilsson

Keyword(s):

Fiber Laser ◽

Output Power ◽

Continuous Wave ◽

Large Core ◽

Continuous Wave Output Power ◽

Core Fiber

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Ytterbium-doped large-core fiber laser with 1.36 kW continuous-wave output power

Optics Express ◽

10.1364/opex.12.006088 ◽

2004 ◽

Vol 12 (25) ◽

pp. 6088 ◽

Cited By ~ 618

Author(s):

Y. Jeong ◽

J. K. Sahu ◽

D. N. Payne ◽

J. Nilsson

Keyword(s):

Fiber Laser ◽

Output Power ◽

Continuous Wave ◽

Large Core ◽

Continuous Wave Output Power ◽

Core Fiber

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Stable continuous-wave mode-locked laser from a 1645 nm Er:YAG ceramic oscillator

Applied Physics Express ◽

10.35848/1882-0786/ac481c ◽

2022 ◽

Author(s):

Yangyu Liu ◽

Xue Cao ◽

AnHua Xian ◽

Guangmiao Liu ◽

Wei zhou ◽

...

Keyword(s):

Solid State ◽

Pulse Width ◽

Peak Power ◽

Continuous Wave ◽

Modulation Depth ◽

Average Power ◽

Mode Locking ◽

Wave Mode ◽

Semiconductor Saturable Absorber ◽

Continuous Wave Mode

Abstract We demonstrate stable continuous-wave mode-locking (CWML) pulses around 1645nm by employing the home-made Er:YAG ceramic. By using a fiber laser and semiconductor saturable absorber mirror (SESAM) with modulation depth of 1.2%, we get ML pulses with the output average power up to 815 mW, the pulse width shortened as ~4 ps, and the peak power of 1.8 kW. With the SESAM of modulation depth of 2.4%, the second-order harmonic ML pulses were also obtained. As far as we know, this is the first report of CWML from Er3+-doped ceramics and also the shortest pulse duration in Er3+-doped solid-state oscillators.

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LD-pumped high-power continuous-wave Pr3+:YLF deep red lasers at 718.5 and 720.8 nm

Laser Physics ◽

10.1088/1555-6611/ac4099 ◽

2021 ◽

Vol 32 (2) ◽

pp. 025801

Author(s):

Xiangrui Liu ◽

Zhuang Li ◽

Chengkun Shi ◽

Bo Xiao ◽

Run Fang ◽

...

Keyword(s):

Output Power ◽

High Power ◽

Slope Efficiency ◽

Laser Emission ◽

Continuous Wave ◽

Optical Glass ◽

Maximum Output Power ◽

Glass Plate ◽

Maximum Output ◽

First Time

Abstract We demonstrated 22 W LD-pumped high-power continuous-wave (CW) deep red laser operations at 718.5 and 720.8 nm based on an a-cut Pr3+:YLF crystal. The output power of both polarized directions reached the watt-level without output power saturation. A single wavelength laser operated at 720.8 nm in the π-polarized direction was achieved, with a high output power of 4.5 W and high slope efficiency of approximately 41.5%. To the best of our knowledge, under LD-pumped conditions, the laser output power and slope efficiency are the highest at 721 nm. By using a compact optical glass plate as an intracavity etalon, we suppressed the π-polarized 720.8 nm laser emission. And σ-polarized single-wavelength laser emission at 718.5 nm was achieved, with a maximum output power of 1.45 W and a slope efficiency of approximately 17.8%. This is the first time that we have achieved the σ-polarized laser emission at 718.5 nm generated by Pr3+:YLF lasers.

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Continuous-Wave and Passively Q-Switched Er:Y2O3 Ceramic Laser at 2.7 μm

International Journal of Optics ◽

10.1155/2018/3153614 ◽

2018 ◽

Vol 2018 ◽

pp. 1-5 ◽

Cited By ~ 2

Author(s):

Zhipeng Qin ◽

Guoqiang Xie ◽

Jian Zhang ◽

Jingui Ma ◽

Peng Yuan ◽

...

Keyword(s):

Output Power ◽

Continuous Wave ◽

Maximum Output Power ◽

Maximum Output ◽

Average Output ◽

Semiconductor Saturable Absorber ◽

Infrared Spectral ◽

Maximum Average Output Power ◽

Ceramic Laser ◽

Stable Passive

We report on a continuous-wave (CW) and passively Q-switched Er:Y2O3 ceramic laser in mid-infrared spectral region. In the CW regime, a maximum output power of 2.07 W is achieved at 2717.3 nm with a slope efficiency of 13.5%. Stable passive Q-switching of the Er:Y2O3 ceramic laser is demonstrated based on semiconductor saturable absorber mirror. Under an absorbed pump power of 12.4 W, a maximum average output power of 223 mW is generated with a pulse energy of 1.7 μJ and a pulse width of 350 ns at 2709.3 nm.

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Passively harmonic mode-locked fiber laser based on ReS2 saturable absorber

Modern Physics Letters B ◽

10.1142/s0217984917502062 ◽

2017 ◽

Vol 31 (18) ◽

pp. 1750206 ◽

Cited By ~ 21

Author(s):

Feifei Lu

Keyword(s):

Pump Power ◽

Fiber Laser ◽

Output Power ◽

Saturable Absorber ◽

Repetition Rate ◽

Mode Locking ◽

High Repetition Rate ◽

Pulse Interval ◽

Saturable Absorption ◽

Harmonic Mode

We demonstrate the generation of harmonic mode-locking (HML) in an erbium-doped fiber laser with a microfiber-based rhenium disulfide (ReS2) saturable absorber (SA). Taking advantages of both saturable absorption and large third-order nonlinear effect of ReS2, HML pulse with 318.5 MHz repetition rate can be obtained, corresponding to 168th harmonic of fundamental repetition frequency of 1.896 MHz. When the pump power is increased gradually, the pulse interval remains constant, while the output power increases linearly. At the pump power of 450 mW, the output power is [Formula: see text]12 mW. The proposed high-repetition-rate pulse lasers would attract considerable attention due to its potential applications in soliton communications and frequency combs.

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