Ho:YLF &amp; Ho:LuLF slab amplifier system delivering 200 mJ, 2 µm single-frequency pulses

Strauss, H. J.; Koen, W.; Bollig, C.; Esser, M. J. Daniel; Jacobs, Cobus; Collett, Ojp; Preussler, D.

doi:10.1364/oe.19.013974

Cited by 43 publications

(17 citation statements)

References 15 publications

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“…In a previous work, the experimental ∆H PT for LiF was reported and reasonable agreement with the literature value was found [13,17]. Compared to the literature data, the main difference in the results were noticed for LuF 3 [10]. Since our DSC experiments were repeatedly confirmed and the raw materials used were very pure, these new results have been taken into account to the final calculation of the LiF-LuF 3 phase diagram.…”

Section: Resultssupporting

confidence: 82%

“…In that work, the LiF−LuF 3 phase diagram was described with an intermediary compound (LLF) which melts congruently at 1098 K. Two eutectic points were settled, one at 22 mol% LuF 3 and 968 K and the other at 54 mol% LuF 3 and 1083 K. The polymorphic transition from orthorhombic to hexagonal structure in LuF 3 was reported at 1218 K. Harris et al [12] revised this phase diagram in the 1980s, determining the melting point of LLF at 1123 K, the first eutectic was reported at 20 mol% LuF 3 and 977 K and the second one at 58 mol% LuF 3 and 1105 K. Both of them used thermal analysis to determine the invariant reactions and respective temperatures. In this work, the LiF−LuF 3 binary system was experimentally revised through DSC technique.…”

Section: Introductionmentioning

confidence: 99%

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Experimental evaluation and thermodynamic assessment of the LiF–LuF3 phase diagram

et al. 2013

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The phase diagram of the system LiF−LuF 3 has been revised using thermal analysis. Specific heat capacity and enthalpy of phase transition and fusion were measured by differential scanning calorimetry for all compounds belonging to the system. A thermodynamic optimization of the LiF−LuF 3 phase diagram was performed by fitting the Gibbs energy functions to experimental data that were taken from the literature or measured in this work. Excess energy terms, which describe the effect of interaction between the two fluoride compounds in the liquid solution, were expressed by the Redlich-Kister polynomial function. The theoretical phase diagram assessed was in suitable agreement with the re-evaluated experimental data.

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Section: Resultssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Experimental evaluation and thermodynamic assessment of the LiF–LuF3 phase diagram

et al. 2013

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“…Ho‐based amplifiers seeded by picosecond pulses appear well suited to pump OPCPA schemes operating beyond a 4 μm wavelength . Among the various Ho‐doped active materials, Ho:YLF and Ho:YAG are most widely used and have proven their suitability for high energy operation in the nanosecond regime . Millijoule Ho:YAG and Ho:YLF regenerative amplifiers (RA) with kilohertz pulse repetition rate have been demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Taming chaos: 16 mJ picosecond Ho:YLF regenerative amplifier with 0.7 kHz repetition rate

Grafensteın

Böck

Steinmeyer

et al. 2016

Laser & Photonics Reviews

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Nonlinear dynamics of continuous-wave pumped regenerative amplifiers operating at 2 μm are investigated. At repetition rates near 1 kHz, three different operation regimes are observed, including stable regular, chaotic, and subharmonic dynamics. Numerical simulations reproduce this behavior in a quantitative way. In particular, we find stable periodic doubling regimes in which every other seed pulse experiences high gain. Exploiting a narrow parameter window beyond the onset of chaos enables operation of a high-gain picosecond Ho:YLF regenerative amplifier which delivers up to 16 mJ picosecond pulses at 2050 nm. Energy fluctuations of the 700 Hz pulse train are as low as 0.9% rms.

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“…These limitations can be mitigated using powerful pump lasers emitting at 2-μm wavelength thereby reducing the photon ratio mismatch and allowing the use of highly nonlinear non-oxide crystals such as ZGP [13]. While the technology of such lasers, based on Q-switched Ho:YLF (or Ho:LuLiF) and Ho:YAG, is very mature for generating high-energy nanosecond pulses [14][15][16][17][18][19][20], amplification of few picosecond pulses from such systems to the multi-tens of mJ has not been reported. In this Letter, we report on a compact and stable laser system operating at 2-μm wavelength, delivering ∼10 ps duration optical pulses with up to 39-mJ output energy at 100-Hz repetition rate.…”

mentioning

confidence: 99%

2-μm wavelength, high-energy Ho:YLF chirped-pulse amplifier for mid-infrared OPCPA

et al. 2015

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A 2-μm wavelength laser delivering up to 39-mJ energy, ∼10 ps duration pulses at 100-Hz repetition rate is reported. The system relies on chirped pulse amplification (CPA): a modelocked Er:Tm:Ho fiber-seeder is followed by a Ho:YLF-based regenerative amplifier and a cryogenically cooled Ho:YLF single pass amplifier. Stretching and compressing are performed with large aperture chirped volume Bragg gratings (CVBG). At a peak power of 3.3 GW, the stability was <1% rms over 1 h, confirming high suitability for OPCPA and extreme nonlinear optics applications. ultra-short mid-IR pulses, but further progress is hampered by the near exclusive usage of ∼1 μm pump lasers. These pump lasers impose an unfavorable photon ratio between pump and signal/idler that limits efficiency, prevents accessing the highly efficient class of non-oxide crystals, and presents serious power scaling limitations due to linear and two-photon absorption [12]. These limitations can be mitigated using powerful pump lasers emitting at 2-μm wavelength thereby reducing the photon ratio mismatch and allowing the use of highly nonlinear non-oxide crystals such as ZGP [13]. While the technology of such lasers, based on Q-switched Ho:YLF (or Ho:LuLiF) and Ho:YAG, is very mature for generating high-energy nanosecond pulses [14][15][16][17][18][19][20], amplification of few picosecond pulses from such systems to the multi-tens of mJ has not been reported. In this Letter, we report on a compact and stable laser system operating at 2-μm wavelength, delivering ∼10 ps duration optical pulses with up to 39-mJ output energy at 100-Hz repetition rate. Highly efficient temporal compression of narrow-band picosecond pulses was performed at the multi-tens of mJ energy-level in a chirped volume Bragg grating (CVBG).The laser system relies on chirped pulse amplification (CPA) architecture consisting of a fiber seeder, a CVBG stretcher, two consecutive amplification stages, and a large aperture CVBG compressor (Fig. 1). The all-fiber seeder is a multi-stage system (Menlo Systems GmbH) starting with an amplified modelocked Er:fiber oscillator delivering femtosecond optical pulses at 100-MHz repetition rate and 1.5-μm wavelength. These pulses are frequency shifted to 2052-nm wavelength and spectrally narrowed to ∼1.5 nm bandwidth before seeding a series of Tm:Ho fiber amplifiers [21]. The 4-nJ energy, picosecond duration pulses emerging from these amplifiers at 100 MHz form the seed for the CPA chain thereby removing the problem of modelocking Ho-based systems directly. These pulses are temporally stretched to 170-ps duration in a double-pass, CVBG-based stretcher. The CVBG (OptiGrate Corp.) used in this stretcher is broadband AR-coated around 2052 nm, has a 5 mm × 8 mm clear aperture, a chirp rate of 150 ps/nm, and a design wavelength of 2053.5 nm. Upon stretching, the 100-MHz train is passed through a rubidium titanyle phosphate (RTP) pulse picker to reduce the repetition rate to 100 Hz. The pulses are then passed through an optical isolator and directed toward a regen...

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Ho:YLF & Ho:LuLF slab amplifier system delivering 200 mJ, 2 µm single-frequency pulses

Cited by 43 publications

References 15 publications

Experimental evaluation and thermodynamic assessment of the LiF–LuF3 phase diagram

Experimental evaluation and thermodynamic assessment of the LiF–LuF3 phase diagram

Taming chaos: 16 mJ picosecond Ho:YLF regenerative amplifier with 0.7 kHz repetition rate

2-μm wavelength, high-energy Ho:YLF chirped-pulse amplifier for mid-infrared OPCPA

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