An efficient continuous-wave and Q-switched single-pass two-stage Ho:YLF MOPA system

Kwiatkowski, Jacek; Jabczyński, Jan Karol; Żendzian, Waldemar

doi:10.1016/j.optlastec.2014.09.014

Cited by 13 publications

(6 citation statements)

References 10 publications

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“…In contrast to -NaYF4, Czochralski-grown crystals of lanthanide-doped LiYF4 are commercially available from various suppliers and widely used as solid state laser materials. Well-known examples are LiYF4:Pr [13][14][15][16][17][18][19][20], LiYF4:Nd [21][22][23][24][25][26][27][28][29], LiYF4:Yb [30][31][32][33][34][35], LiYF4:Er [36][37][38][39][40][41][42][43], LiYF4:Ho [44][45][46][47][48][49][50] and LiYF4:Tm [51][52][53][54][55][56]. LiYF4 laser crystals are grown under strict exclusion of water and humidity to avoid the incorporation of OH − into the fluoride lattice which is a well-known luminescence quencher owing to its highfrequency vibrational modes [57,58].…”

Section: Introductionmentioning

confidence: 99%

LiYF4:Yb/LiYF4 and LiYF4:Yb,Er/LiYF4 core/shell nanocrystals with luminescence decay times similar to YLF laser crystals and the upconversion quantum yield of the Yb,Er doped nanocrystals

et al. 2020

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We developed a procedure to prepare luminescent LiYF4:Yb/LiYF4 and LiYF4:Yb,Er/LiYF4 core/shell nanocrystals with a size of approximately 40 nm revealing luminescence decay times of the dopant ions that approach those of high-quality laser crystals of LiYF4:Yb (Yb:YLF) and LiYF4:Yb,Er (Yb,Er:YLF) with identical doping concentrations. As the luminescence decay times of Yb3+ and Er3+ are known to be very sensitive to the presence of quenchers, the long decay times of the core/shell nanocrystals indicate a very low number of defects in the core particles and at the core/shell interfaces. This improvement in the performance was achieved by introducing two important modifications in the commonly used oleic acid based synthesis. First, the shell was prepared via a newly developed method characterized by a very low nucleation rate for particles of pure LiYF4 shell material. Second, anhydrous acetates were used as precursors and additional drying steps were applied to reduce the incorporation of OH− in the crystal lattice, known to quench the emission of Yb3+ ions. Excitation power density (P)-dependent absolute measurements of the upconversion luminescence quantum yield (ΦUC) of LiYF4:Yb,Er/LiYF4 core/shell particles reveal a maximum value of 1.25% at P of 180 Wcm−2. Although lower than the values reported for NaYF4:18%Yb,2%Er core/shell nanocrystals with comparable sizes, these ΦUC values are the highest reported so far for LiYF4:18%Yb,2%Er/LiYF4 nanocrystals without additional dopants. Further improvements may nevertheless be possible by optimizing the dopant concentrations in the LiYF4 nanocrystals.

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Section: Introductionmentioning

confidence: 99%

LiYF4:Yb/LiYF4 and LiYF4:Yb,Er/LiYF4 core/shell nanocrystals with luminescence decay times similar to YLF laser crystals and the upconversion quantum yield of the Yb,Er doped nanocrystals

et al. 2020

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“…The transmitted, unabsorbed in the oscilla− tor, partially polarized Tm:fibre laser pump radiation can be subsequently used to pump the amplifier stage. An amplifier system by applying another Ho:YLF crystal rotated by 90°a round the laser beam axis can be developed in CW, as well as in Q−switched configurations [25,26].…”

Section: Discussionmentioning

confidence: 99%

Highly efficient high power CW and Q-switched Ho:YLF laser

Kwiatkowski

2015

Opto-Electronics Review

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“…13 The following assumptions are made so that the pulse-amplification process can be treated analytically. 15,16 The energy fluence at position z ¼ 0 can be expressed as J 0 ¼ hν s c s ∫ τ 0 dt 0 Φ s;0 ðt 0 Þ, which is related with the energy and the transverse area. (1) and (2), known as the Frank-Nodvik equations, 14 in which Φ s;0 ðtÞ, Δ 0 ðzÞ, L, and τ denote the arbitrary input pulse intensity, inversion distribution, laser medium length, and temporal window, respectively.…”

Section: Theory Of Pulse Shapingmentioning

confidence: 99%

Polarization beam combination technique for gain saturation effect compensation in high-energy systems

Chen

Peng

et al. 2016

Opt. Eng

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Polarization beam combination technique for gain saturation effect compensation in high-energy systems," Opt. Eng. 55(6), 066111 (2016), Abstract. To compensate for the gain saturation effect in the high-energy laser amplifier, a modified polarization beam combination (PBC) method is introduced to reshape temporal waveform of the injected laser pulse to obtain a controlled high-energy laser pulse shape after amplification. One linearly polarized beam is divided into two orthogonal polarized beams, which spatially recombine together collinearly after propagating different optical paths with relative time delay in PBC structure. The obtained beam with polarization direction being rotated by the following half wave plate is divided and combined again to reform a new beam in another modified polarization beam structure. The reformed beam is injected into three cascaded laser amplifiers. The amplified pulse shape can be controlled by the incident pulse shape and amplifier gain, which is agreeable to the simulation by the Frank-Nodvik equations. Based on the simple method, the various temporal waveform of output pulse with tunable 7 to 20 ns pulse duration can be obtained without interferometric fringes. Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 06/21/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Optical Engineering 066111-8 June 2016 • Vol. 55(6) Chen et al.: Polarization beam combination technique for gain saturation effect compensation in high-energy systems Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 06/21/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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An efficient continuous-wave and Q-switched single-pass two-stage Ho:YLF MOPA system

Cited by 13 publications

References 10 publications

LiYF4:Yb/LiYF4 and LiYF4:Yb,Er/LiYF4 core/shell nanocrystals with luminescence decay times similar to YLF laser crystals and the upconversion quantum yield of the Yb,Er doped nanocrystals

LiYF4:Yb/LiYF4 and LiYF4:Yb,Er/LiYF4 core/shell nanocrystals with luminescence decay times similar to YLF laser crystals and the upconversion quantum yield of the Yb,Er doped nanocrystals

Highly efficient high power CW and Q-switched Ho:YLF laser

Polarization beam combination technique for gain saturation effect compensation in high-energy systems

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