CFEL-UFOX

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2018-01-17
12:51
[PUBDB-2018-00670] Conference Presentation
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High-energy mid-infrared sub-cycle pulse synthesis
CLEO Pacific Rim, Meeting locationSingapore, Singapore, 31 Jul 2017 - 4 Aug 20172017-07-312017-08-04
We present the carrier-envelope phase-stable mid-infrared sub-cycle pulses, synthesized from an optical parametric amplifier covering the 2.5-9.0 μm range. The strong-field applications in solids and nano-structures are discussed..
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2018-01-12
12:43
[PUBDB-2018-00611] Conference Presentation
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A CEP-stable, femtosecond 8.5 μm source based on intrapulse DFG of 2.1 μm pulses
Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference , CLEO/Europe-EQEC, Meeting locationMünchen, Germany, 25 Jun 2017 - 29 Jun 20172017-06-252017-06-29  GO
Few-cycle carrier-envelope phase (CEP) stable laser pulses enable the precise control of strong-field electron dynamics, such as high-harmonic generation in gases and solids or electron emission in nano-structures [1]. The intrapulse difference-frequency generation (DFG) pumped by a broadband pulse is a reliable method of producing passively CEP-stable pulses. [...]
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2018-01-11
15:45
[PUBDB-2018-00540] Journal Article
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Evolutionary Optimization of Graphene-Metal Metasurfaces for Tunable Broadband Terahertz Absorption
ddc:620
Tunable terahertz absorbers based on graphene frequency selective surfaces are designed using well-established evolutionary optimization techniques. Randomly initialized hill climbing (RHC) algorithm is applied to find the design with the broadest bandwidth. [...]
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2018-01-11
10:27
OpenAccess [PUBDB-2018-00431] Poster
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Enhanced soft-X-ray high-harmonic generation driven by mid-IR pulses mixed with their third harmonic
6th International Conference on Attosecond Physics, ATTO 2017, Meeting locationXi'an, China, 2 Jul 2017 - 7 Jul 20172017-07-022017-07-07  GO
We systematically study the enhancement of soft-X-ray high-harmonic generation in Ar, reaching a factor as high as ~8, at different pressures driven by two-color (ω+3ω) mid-infrared waveforms and compare the results to full 3D simulations..
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2018-01-11
10:16
OpenAccess [PUBDB-2018-00424] Conference Presentation
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Circularly polarized high-order harmonics from solids driven by single-color infrared pulses
6th International Conference on Attosecond Physics, ATTO 2017, Meeting locationXi'an, China, 2 Jul 2017 - 7 Jul 20172017-07-022017-07-07  GO
Intraband and interband dynamics generating high-order harmonics in solids exhibit qualitatively different responses to driver-pulse ellipticity, enabling ellipticity-based harmonic cutoff extension. Ab-initio calculations and experiments demonstrate generation of circularly polarized harmonics from single-color pulses..
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2018-01-11
09:19
[PUBDB-2018-00401] Conference Presentation
; ; ; et al
High-harmonic emission in solids driven by mid-infrared sub-cycle pulses
6th International Conference on Attosecond Physics, ATTO 2017, Meeting locationXi'an, China, 2 Jul 2017 - 7 Jul 20172017-07-022017-07-07
High-harmonic generation in silicon driven by mid-infrared pulses at 2.5−9.0 μm is reported. We observe even and odd harmonics (~19th order) with few-cycle pulses and near-continuous spectra with sub-cycle pulses, indicating an isolated harmonic emission..
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2018-01-11
08:25
[PUBDB-2018-00386] Contribution to a conference proceedings/Contribution to a book
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Enhanced soft X-ray high-harmonic generation driven by two-color (ω+3ω) mid-IR laser pulses
Conference on Lasers and Electro-Optics : [Proceedings] - OSA Washington, D.C., 2017. - ISBN 978-1-943580-27-9 - doi:10.1364/CLEO_AT.2017.JTh2A.50
Conference on Lasers and Electro-Optics: Applications and Technology, CLEO, Meeting locationSan Jose, California, USA, 13 May 2017 - 18 May 20172017-05-132017-05-18
OSA Washington, D.C., 1 - 2 (2017) [10.1364/CLEO_AT.2017.JTh2A.50]  GO
We demonstrate efficiency enhancement of soft X-ray high-harmonic generation from Ar in the range of 40-200 eV using two-color (ω+3ω) mid-infrared to visible pulses with relative phase control, which is in qualitative agreement with 3D simulations..
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2018-01-10
13:51
DBCoverage [PUBDB-2018-00352] Journal Article
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Publisher Correction: Ellipticity dependence of high-harmonic generation in solids originating from coupled intraband and interband dynamics
ddc:500
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2018-01-03
08:04
[PUBDB-2018-00048] Journal Article
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CEP dependence of signal and idler upon pump-seed synchronization in optical parametric amplifiers
Optics letters 43(2), 178 - 181 (2018) [10.1364/OL.43.000178]  GO
ddc:530
We study the effect of pump-seed timing fluctuations on the carrier-envelope phase (CEP) of signal and idler pulses emerging from an OP(CP)A. A simple analytical model is derived in order to provide an intuitive explanation of the origin of CEP fluctuations, while split-step simulations are performed to cover a broad range of different seeding schemes. [...]
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2018-01-02
11:39
[PUBDB-2018-00015] Journal Article
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Tunable Low-Jitter Low-Drift Spurious-Free Transposed-Frequency Optoelectronic Oscillator
ddc:620
We propose and theoretically and experimentally demonstrate a novel tunable spurious-free single-loop optoelectronic oscillator (OEO) with low drift and low-phase noise. In the proposed transposed-frequency OEO (TF-OEO), a nonreciprocal bias unit and an optical phase modulator in a fiber Sagnac interferometer function jointly as an intrinsically drift-free intensity modulator, which improves the long-term drift. [...]
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