A compact autocorrelator for the wavelength range between 4 and

Brunken, M.; Casper, L.C.; Genz, H.; Heßler, Christoph; Khodyachykh, S.; Richter, A.

doi:10.1016/s0030-3992(03)00026-4

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…2) Apart from the applications, developing the techniques to characterize the FEL pulses in terms of the pulse duration and the chirp is also an important issue. [3][4][5][6][7][8][9][10] Recall that the FEL pulses originate from the accelerated electron bunches, and their energy and phase are very difficult to maintain constant. Besides the lasing of FEL starts from the spontaneous emissions which may have slightly different photon energies.…”

Section: Introductionmentioning

confidence: 99%

Use of Fringe-Resolved Autocorrelation for the Diagnosis of the Wavelength Stability of a Free Electron Laser

Qin¹,

Nakajima²,

Kii³

et al. 2012

Jpn. J. Appl. Phys.

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Although monitoring the wavelength stability of a free-electron laser provides users valuable useful information, a single-shot measurement of the laser spectrum is not always an easy task in the mid/far-infrared wavelength region due to the lack or very high cost of an array-type photodetector, etc. We propose to use fringe-resolved autocorrelation to monitor the wavelength stability of an oscillator-type free-electron laser. The idea is verified by the numerical experiments for intensity and fringe-resolved autocorrelations which include shot-to-shot fluctuations of intensity, duration, and central wavelength of micropulses as well as the chirps of both micro/macro pulses.

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Section: Introductionmentioning

confidence: 99%

Use of Fringe-Resolved Autocorrelation for the Diagnosis of the Wavelength Stability of a Free Electron Laser

Qin¹,

Nakajima²,

Kii³

et al. 2012

Jpn. J. Appl. Phys.

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“…It is essential to change the crystal's phase-matching angle to generate a 2𝜔 beam by varying the wavelength of the laser beam. This beam is also obtained by changing the optical axis of the crystal with top-mounted two translation stages, making it possible to be moved in 4 different directions [2]. The 2𝜔 radiation reaches the ultrafast photodetector (ALPHALAS UPD-200-SP, with the wavelength range from 320 nm to 1100 nm) due to be measured by passing through a lens [24].…”

Section: Pulse Duration Measurements Of Ti: Sapphire Lasermentioning

confidence: 99%

“…On account of that, high-precision measuring assemblies with unique types of equipments constantly keep competitive rivalry in accelerator based light sources community. In the literature, miscellaneous studies with the inclusion of autocorrelator designs, which are dedicated to measure optical parameters such as photon energy, wavelength etc., have been reported on pulse duration measurements and characterization of ultrashort photon pulses [1][2][3][4][5]. For instance, considering the facility Free-Electron Lasers for Infrared eXperiments (FELIX), far-IR FEL pulses were measured in the spectral range of 8.5-37 microns with CdTe crystals.…”

Section: Introductionmentioning

confidence: 99%

A tunable autocorrelator for pulse measurements at IR FEL-oscillator facilities

Cicek¹,

Seidel²,

Ketenoglu³

2021

J. Inst.

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Radiation characteristics of a Free-Electron Laser (FEL) such as pulse length, time structure, intensity, bandwidth, wavelength, power, frequency, etc., which were measured on a diagnostics table, are thoroughly discussed. In this respect, pulse length measurements of an Infrared FEL (IR-FEL) beam are evaluated through an intensity autocorrelator, designed and installed as a diagnostics tool at the “Helmholtz-Zentrum Dresden-Rossendorf (HZDR)-Radiation Source ELBE” of Germany. In addition, the autocorrelator was designed as a unique, cost-effective, and in-house setup. It operates within the wavelength range of 3–35 microns, using Cadmium-Telluride (CdTe) crystals in the Second Harmonic Generation (SHG) medium. The intensity autocorrelation curves were obtained for the FEL beam with the wavelength of 26.2 microns, indicating an FWHM pulse duration ranging between 3.29–8.03 ps with different optical cavity detuning values. Furthermore, the pulse duration of Ti: sapphire laser beam is measured between 1–3 ps through the designed autocorrelator at the ELBE light source. On the other hand, the setup may pave the way for pulse length measurements of the Turkish infrared FEL-oscillator facility (TARLA) as well, which is currently under the hardware installation phase. Finally, it is elaborated in section 3 that the unique autocorrelator design fully meets all requirements for pulse length measurements of an infrared FEL source.

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