Efficient generation of mode-locked pulses in Nd:YVO_4 with a pulse duration adjustable between 34 ps and 1 ns

Lührmann, Markus; Theobald, Christian; Wallenstein, R.; L’huillier, Johannes A.

doi:10.1364/oe.17.006177

Cited by 16 publications

(4 citation statements)

References 22 publications

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“…Polarization dependent UPS measurements were carried out with an electron time‐of‐flight spectrometer. The exciting DUV radiation at a wavelength of λ = 213 nm with 20 kHz repetition rate and a pulse duration of 300 ps was generated by frequency conversion of a customized Nd:YVO 4 laser . The polarization was changed between clockwise and counterclockwise polarized light by turning a quarter wave plate (Halle Nachfl.).…”

Section: Methodsmentioning

confidence: 99%

A Silicon‐Based Room Temperature Spin Source without Magnetic Layers

Kettner

Bhowmick

Bartsch

et al. 2016

Adv Materials Inter

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for self-assembled helical molecules attached to metals, mostly on gold substrates, [ 9 ] and for chiral molecules evaporated onto a magnetic substrate. [ 10 ] Recently, it was further shown that helical poly-alanine can be used to magnetize ferromagnetic nickel at low temperatures. [ 11 ] In this Communication we present a silicon-based spin source at room temperature without magnetic layers, based only on the spin fi lter effect in dsDNA covalently bound to Si(100).The fi rst step in developing the spin source requires the immobilization of dsDNA on Si(100). A good control of the selfassembly is possible via nucleophilic-electrophilic chemistry or by thiol-ene/yne click chemistry. Both approaches enable the binding of DNA to semiconductor surfaces. [ 12 ] In the present experiment we used the nucleophilic-electrophilic amine-isothiocyanate reaction. A schematic of the preparation steps involved in this reaction is shown in Figure 1 . For this purpose 2.5% HF acid solution was used to etch-off the natural oxide layer on silicon and to form a hydrogen terminated silicon surface. Subsequent treatment with acid peroxide (piranha solution) leads to the formation of a hydroxylated surface. Water contact angles of less than 20° indicate a highly hydrophilic nature of the surface, as expected. Functionalization of the surface with a solution of 3-isothiocyanatopropyl triethoxy silane (ICPTES) linker molecules in dry toluene increases the hydrophobicity, causing an increase of the contact angle to nearly 70°. [ 13 ] This confi rms the successful formation of linker molecules on the substrate, because the decrease of hydrophilicity is a result of the aliphatic chains of the linker molecules. Afterward, dsDNA was immobilized by wetting of the surface with 10 × 10 −6 M solution of 50 base pair dsDNA dissolved in phosphate buffer at pH 8 for 72 h. The water contact angle decreases to 35° due to the hydrophilicity of the DNA's backbone.The functionalization of the silicon surface was also investigated by X-ray photoelectron spectroscopy (XPS) for binding energies in the E B = 0-650 eV range, as shown in Figure 2 . On the hydroxylated silicon surface the Si 2p and 2s features are detected at E B = 100.7 eV and E B = 152.1 eV binding energies, respectively. Additionally, the O 1s signal is clearly visible at E B = 532.1 eV binding energy. After attaching the linker molecules to the surface additional signals appear from C 1s and N 1s at about 285 and 400 eV binding energies, respectively. Further, a small contribution from S 2s at E B = 226.3 eV can be discerned. These signals are contributions from the carbon chains and the N  C  S moiety of the linker molecules. In case of the dsDNA functionalized surface the intensity of nitrogen and carbon features increase and a P 2s signal appears at 191.8 eV binding energy. These changes are contributed from the dsDNA backbone. For a better insight into the preparation high resolution XPS allows to confi rm the binding of single Controlling the electron spin orientation and spin inj...

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Section: Methodsmentioning

confidence: 99%

A Silicon‐Based Room Temperature Spin Source without Magnetic Layers

Kettner

Bhowmick

Bartsch

et al. 2016

Adv Materials Inter

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“…Because of the Kerr effect of the gain medium, the interaction between the longitudinal modes forms the self-mode-locked pulse trains [14][15][16]. When multimode oscillation occurs, the F-P effect, or spatial hole burning (SHB) effect in a standing-wave resonator leading to longitudinal modes grouping, changes the self-mode-locked pulse waveforms to the burst pulse waveforms [17][18][19][20][21]. In the experiment, by adjusting the optical length of the gain medium and laser cavity, output burst pulse trains with different characteristics were achieved.…”

Section: Theoretical Modelmentioning

confidence: 99%

Time–Frequency and Spectrum Analyses of All-Solid-State Self-Mode-Locked Burst Pulse Lasers

Xu,

Hu,

et al. 2024

Photonics

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The theoretical and experimental characteristics of all-solid-state self-mode-locked burst pulse lasers are investigated in this study. The time–frequency and spectrum analyses of the lasers incorporating Fabry–Pérot (F-P) structures are presented, along with the development of the corresponding theoretical model. Self-mode-locked burst pulse lasers are experimentally constructed to reduce intracavity losses using the front and rear end surfaces of the gain media to form F-P structures. When the laser cavity length is 600 mm and the gain media lengths are 5, 6, and 10 mm, each burst pulse produced contains 56, 47, and 28 subpulses, respectively, with the same burst pulse width of 2 ns. The burst pulse train with beam quality M2 = 1.37 and an average output power of 0.23 W is obtained when the gain medium length is 5 mm and the pump power is 4.5 W. The corresponding burst pulse repetition frequency is 0.25 GHz and the subpulse repetition frequency is 13.66 GHz. The time–frequency spectral analyses of the laser signals provide a good representation of laser spectral information that even the currently available highest-resolution spectrometers cannot resolve.

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“…2. The pump laser system [15] includes an actively mode-locked Nd:YVO 4 oscillator [16], a pulse picker, a 20 kHz Nd:YVO 4 regenerative amplifier and a frequency doubling set-up. The pump pulses at λ = 532 nm have an energy of about 1.3 mJ and a duration of about 250 ps.…”

Section: Non-collinear Opcpa Set-upmentioning

confidence: 99%

A sub-10 fs noncollinear optical parametric chirped pulse amplifier pumped at 20 kHz pulse repetition rate

et al. 2013

Self Cite

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We demonstrate a two-stage three-pass non-collinear optical parametric chirped-pulse amplifier delivering 125 ñJ pulse energy at 20 kHz repetition rate, corresponding to an average power of 2.5 W. The system is pumped by a 20 kHz Nd:YVO 4 regenerative amplifier system. A grism-pair stretcher stretches the 6 fs seed pulses to more than 100 ps from 650 nm to 1000 nm. The amplified signal pulses are compressed with SF57 and fused silica glass blocks. Using an acousto-optical programmable dispersive filter to compensate the residual higher-order dispersion pulses of 9.6 fs duration are obtained which corresponds to a peak power of 13 GW. We estimate the level of parametric superfluorescence with the spectral hole technique.

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Efficient generation of mode-locked pulses in Nd:YVO_4 with a pulse duration adjustable between 34 ps and 1 ns

Cited by 16 publications

References 22 publications

A Silicon‐Based Room Temperature Spin Source without Magnetic Layers

A Silicon‐Based Room Temperature Spin Source without Magnetic Layers

Time–Frequency and Spectrum Analyses of All-Solid-State Self-Mode-Locked Burst Pulse Lasers

A sub-10 fs noncollinear optical parametric chirped pulse amplifier pumped at 20 kHz pulse repetition rate

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