Addressing Spectral Narrowing in Cryogenic Yb:YAG: a 10 mJ Cryogenic Yb:YLF Regenerative Amplifier

Hemmer, Michaël; Zapata, Luis E.; Hua, Yi; Kärtner, Franz X.

doi:10.1364/assl.2016.ath4a.3

Cited by 2 publications

(5 citation statements)

References 9 publications

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“…One remedy is the operation in a first step at 100 Hz repetition rate, which decreases the heat load on the crystals by a factor of 10. At the 100 mJ level, Yb:YAG and Yb:YLF laser amplifiers are demonstrated in our group operating at CT [32, 33] and in other groups at RT [41, 44, 45] . Yb:YLF at CT and Yb:YAG at RT are both good candidates for experimenting the THz generation and exploring electron acceleration while a 1 J laser system is being developed.…”

Section: Laser Chainsmentioning

confidence: 93%

“…Another possibility for high-energy and even shorter pulses is the cryogenically cooled Yb:YLF (cryo-Yb:YLF) laser amplification medium. Amplification has been demonstrated up to 90 mJ at 100 Hz [33, 34] . Simultaneously, room temperature (RT) and commercially available laser sources must be considered.…”

Section: Available Laser Technologiesmentioning

confidence: 99%

“…After stretching, the cryo-YLF laser chain comprises a regenerative amplifier and a booster amplifier [33, 34] . The stretcher and compressor are described in Section 4.6.…”

Section: Description Of Modulesmentioning

confidence: 99%

“…The regenerative amplifier features a ring-type cavity consisting of four mirrors, a Pockels cell and half-wave plate, two thin-film polarizers (TFPs) and a cryo-Yb:YLF crystal [33, 34] . The pump power is provided by a fiber-coupled 300 W diode array operated in the pulsed regime.…”

Section: Description Of Modulesmentioning

confidence: 99%

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Laser system design for table-top X-ray light source

Calendron

Meier

Hemmer

et al. 2018

High Pow Laser Sci Eng

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We present possible conceptual designs of a laser system for driving table-top free-electron lasers based on terahertz acceleration. After discussing the achievable performances of laser amplifiers with Yb:YAG at cryogenic and room temperature and Yb:YLF at cryogenic temperature, we present amplification modules with available results and concepts of amplifier chains based on these laser media. Their performances are discussed in light of the specifications for the tasks within the table-top light source. Technical and engineering challenges, such as cooling, control, synchronization and diagnostics, are outlined. Three concepts for the laser layout feeding the accelerator are eventually derived and presented.

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Section: Laser Chainsmentioning

confidence: 93%

Section: Available Laser Technologiesmentioning

confidence: 99%

“…After stretching, the cryo-YLF laser chain comprises a regenerative amplifier and a booster amplifier [33, 34] . The stretcher and compressor are described in Section 4.6.…”

Section: Description Of Modulesmentioning

confidence: 99%

Section: Description Of Modulesmentioning

confidence: 99%

See 2 more Smart Citations

Laser system design for table-top X-ray light source

Calendron

Meier

Hemmer

et al. 2018

High Pow Laser Sci Eng

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“…To determine the electron bunch duration at the acceleration stage, the STEAM device used for the linac was operated in a streaking mode [14] by adjusting the terahertz beam timing so that the electrons experienced uncancelled magnetic fields at their high-gradient zero-crossing point. The NIR drive laser is a cryogenically cooled Yb:YLF system that delivers optical pulses with 1.2 ps duration and 50 mJ energy at 1020 nm wavelength at 10 Hz repetition rate [32,33]. Terahertz pulses with a center frequency of 0.29 terahertz (3.44 ps period) are generated using the tilted pulse-front (TPF) method [24].…”

Section: Concept and Implementationmentioning

confidence: 99%

Femtosecond phase control in high-field terahertz-driven ultrafast electron sources

Zhang¹,

Fallahi²,

Hemmer³

et al. 2019

Optica

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Terahertz-based electron acceleration has recently emerged as a promising candidate for driving next-generation highbrightness electron sources. Although initial demonstrations have proven the feasibility of this technology for accelerating and manipulating the phase space of electrons, further demonstrations of exquisite timing control are required to make use of terahertz acceleration for demanding applications such as light sources and ultrafast electron diffraction. In this paper, we use a two-stage segmented-terahertz-electron-accelerator-and-manipulator (STEAM) setup to demonstrate control over the electron beam energy, energy spread, and emittance. The first rebunching stage is used to tune the duration of 55 keV electron bunches from a DC electron gun that enables femtosecond phase control at the second accelerating stage. For optimized parameters, energy spread and emittance are reduced by 4× and 6×, respectively, relative to operation with the first stage off. A record energy gain of ∼70 keV was achieved at a peak accelerating field of 200 MV/m, resulting in a >100% energy boost in a terahertz-powered accelerator for the first time. These results represent a critical step forward for the practical implementation of terahertz-powered devices in ultrafast electron sources.

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Addressing Spectral Narrowing in Cryogenic Yb:YAG: a 10 mJ Cryogenic Yb:YLF Regenerative Amplifier

Abstract: Abstract:We report a Yb:YLF based 10 mJ-class cryogenically-cooled regenerative amplifier with 2.1 nm FWHM spectral bandwidth. This system demonstrates the feasibility of high energy, sub-ps cryogenic lasers as an alternative to room temperature Yb:YAG.

Cited by 2 publications

References 9 publications

Laser system design for table-top X-ray light source

Laser system design for table-top X-ray light source

Femtosecond phase control in high-field terahertz-driven ultrafast electron sources

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