Mid-infrared long-pass filter for high-power applications based on grating diffraction

Gerz, Daniel; Schweinberger, Wolfgang; Butler, Thomas P.; Siefke, Thomas; Heusinger, Martin; Amotchkina, Tatiana V.; Pervak, Vladimir; Zeitner, Uwe D.; Pupeza, Ioachim

doi:10.1364/ol.44.003014

Cited by 6 publications

(4 citation statements)

References 24 publications

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“…The collimated beam is focused into a 1 mm thick GaSe crystal with a e 1 2 / focal diameter of approximately 160 μm. After mixing in the nonlinear medium, the driving 2 μm beam is separated from the generated MIR using a gold-coated diffraction grating designed for use as a longpass filter [57]. In this geometry, approximately 500 mW of MIR light is generated at the output crystal face, with an overall efficiency of approximately 2%.…”

Section: Intra-pulse Dfg In Gasementioning

confidence: 99%

Multi-octave spanning, Watt-level ultrafast mid-infrared source

Butler

Lilienfein

et al. 2019

J. Phys. Photonics

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We present a source of brilliant mid-infrared radiation, seamlessly covering the wavelength range between 1.33 and 18 μm (7500-555 cm −1 ) with three channels, employing broadband nonlinear conversion processes driven by the output of a thulium-fiber laser system. The high-average-power femtosecond frontend delivers a 50 MHz train of 250 fs pulses spectrally centered at 1.96 μm. The three parallel channels employ soliton self-compression in a fused-silica fiber, supercontinuum generation in a ZBLAN fiber, and difference-frequency generation in GaSe driven by soliton selfcompressed pulses. The total output enables spectral coverage from 1.33 to 2.4 μm, from 2.4 to 5.2 μm, and from 5.2 to 18 μm with 4.5 W, 0.22 W and 0.5 W, respectively. This spatially coherent source with a footprint of less than 4 m 2 exceeds the brilliance of 3rd-generation synchrotrons by more than three orders of magnitude over 90% of the bandwidth.

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Section: Intra-pulse Dfg In Gasementioning

confidence: 99%

Multi-octave spanning, Watt-level ultrafast mid-infrared source

Butler

Lilienfein

et al. 2019

J. Phys. Photonics

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“…They have great application potential in many research and technical fields such as high-performance computer, optical communication, quantum information and artificial intelligence, due to the broad bandwidth and large information capacity. There are various works [4][5][6][7][8][9][10][11][12] reported in recent years, but all of them are single devices with different realization schemes and different structure types or even different materials. No effective method has been found to design On-chip cascaded bandpass filter and wavelength router directly, which seriously restricts the development of integration for two or more nanophotonic devices.…”

Section: Introductionmentioning

confidence: 99%

“…As for the cascaded nanophotonic devices, bandpass filters, as a fore-end signal processing device, are widely used [4,14], in which light of unwanted band has a large attenuation while expected band can be obtained. At present, the bandpass filter can be designed based on bilayer fish-scale metamaterials [5], and it has a flat pass band but suffers from the shortcoming of big footprint, which is inconvenient for integration.…”

Section: Introductionmentioning

confidence: 99%

On-Chip Cascaded Bandpass Filter and Wavelength Router Using an Intelligent Algorithm

Yuan

et al. 2021

IEEE Photonics J.

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Cascaded nanophotonic devices play a vital role in all-optical connection, all-optical computation and all-optical network. However, there is almost no effective method for the direct design of on-chip cascaded nanophotonic devices, since current study of nanophotonic devices mostly focuses on single device. Here, on-chip cascaded nanophotonic devices are designed based on an intelligent algorithm by combining genetic algorithm, simulated annealing algorithm and finite element method for the first time, and verified experimentally by using silicon-based planar structures. The cascaded devices consist of a bandpass filter and a wavelength router operating in optical communication range. The operation bandwidth of the bandpass filter is 408 nm with transmission more than 80%, within which the communication wavelengths of 1,300 nm and 1,550 nm are routed into different output ports through the wavelength router component. The footprint is only 3.62 μm 2 for the bandpass filter and only 2.56 μm 2 for the wavelength router, which are easy for integration with planar structures and ultrasmall size. This work provides a highly-efficient scheme for the realization of on-chip cascaded nanophotonic devices on the same chip, and lays a foundation for the realization of photonic chip based on intelligent algorithm.

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“…The resulting MIR light was measured with a wire-grid polarizer to be s-polarized and was collimated using a gold-coated off-axis parabola. Separation of the collinearly propagating MIR and driving signals was achieved by using custom-fabricated gold-coated silicon diffraction gratings [25]. These gratings were designed to have a high diffraction efficiency at 2 μm, while retaining a large zeroth-order reflection coefficient for the MIR wavelengths.…”

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confidence: 99%

Watt-scale 50-MHz source of single-cycle waveform-stable pulses in the molecular fingerprint region

et al. 2019

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We report a coherent mid-infrared (MIR) source with a combination of broad spectral coverage (6-18 μm), high repetition rate (50 MHz), and high average power (0.5 W). The waveform-stable pulses emerge via intrapulse differencefrequency generation (IPDFG) in a GaSe crystal, driven by a 30-W-average-power train of 32-fs pulses spectrally centered at 2 μm, delivered by a fiber-laser system. Electro-optic sampling (EOS) of the waveform-stable MIR waveforms reveals their single-cycle nature, confirming the excellent phase matching both of IPDFG and of EOS with 2-μm pulses in GaSe.

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Mid-infrared long-pass filter for high-power applications based on grating diffraction

Cited by 6 publications

References 24 publications

Multi-octave spanning, Watt-level ultrafast mid-infrared source

Multi-octave spanning, Watt-level ultrafast mid-infrared source

On-Chip Cascaded Bandpass Filter and Wavelength Router Using an Intelligent Algorithm

Watt-scale 50-MHz source of single-cycle waveform-stable pulses in the molecular fingerprint region

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