Fluorescence decay studies applying a CW femtosecond dye laser pumped ungated inverse time-correlated single photon counting system

Bäumler, Wolfgang; Schmalzl, A X; Goss, G; Penzkofer, Alfons

doi:10.1088/0957-0233/3/4/009

Cited by 10 publications

(5 citation statements)

References 49 publications

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“…Our random laser consists of porous gallium phosphide obtained by anodic etching (porosity, 45% air; thickness, > 46µm), of which the pores are filled with a 10 mmol/l solution of rhodamine 640 perchlorate in methanol (pump absorption length, 22 µm; minimal gain length, 12 µm [25]). This random laser combines three characteristics which sets it apart from other random lasers.…”

mentioning

confidence: 99%

Spatial Extent of Random Laser Modes

Molen¹,

Tjerkstra²,

Mosk³

et al. 2007

Phys. Rev. Lett.

149

119

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We have experimentally studied the distribution of the spatial extent of modes and the crossover from essentially single-mode to distinctly multimode behavior inside a porous gallium phosphide random laser. This system serves as a paragon for random lasers due to its exemplary high index contrast. In the multimode regime, we observed mode competition. We have measured the distribution of spectral mode spacings in our emission spectra and found level repulsion that is well described by the Gaussian orthogonal ensemble of random-matrix theory.

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mentioning

confidence: 99%

Spatial Extent of Random Laser Modes

Molen¹,

Tjerkstra²,

Mosk³

et al. 2007

Phys. Rev. Lett.

149

119

View full text Add to dashboard Cite

show abstract

“…More importantly, both N 0 and N 2 produce a change " 0 d of the real part of " d which modifies the reflectance line shape. To estimate this contribution, we calculate the spectrum of " 00 d from the known absorption and fluorescence spectra of the dyes [16] and perform a Kramers-Kronig transformation to obtain " 0 d at the emission wavelength. This yields " 0 d =" 00 d 0:39 for cresyl violet and " 0 d =" 00 d 1:65 for rhodamine 101.…”

mentioning

confidence: 99%

“…2(c) and 2(d). Absorption and emission cross sections, spontaneous decay rates and the dielectric constants of silver were taken from the literature [14,16]. For a film thickness around 40 nm the reflectance change induced by the amplifying medium is positive across the whole reflectance dip.…”

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confidence: 99%

Stimulated Emission of Surface Plasmons at the Interface between a Silver Film and an Optically Pumped Dye Solution

2005

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Surface plasmons (SPs) are surface-bound electromagnetic waves supported by metals, offering the possibility of strong spatial confinement of electromagnetic fields on the micro- and nanoscales. They suffer, however, from strong damping caused by internal absorption and radiation losses. Here we demonstrate amplification of SPs by stimulated emission, which marks a possible solution to this problem. We use an attenuated-total-reflection setup to detect stimulated emission of SPs at the interface between a silver film and an optically pumped dye solution acting as the amplifying medium. Clear evidence of stimulated emission is provided by an excellent agreement of the experimental observations with a theoretical analysis. Amplification of SPs can be considered analogous to photon amplification in a laser, thereby suggesting novel approaches in the field of nano-optics.

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“…In contrast, the only way to obtain ultra-low repetition rate fs pulse train out of fiber ring cavity laser systems is to suppress pulses using external modulators. Femtosecond source systems with low repetition rates, ranging from a few hundred hertz have found applications in various fields, including nuclear and radioactivity research [7], free electron laser (FEL) and single photon studies [8], electronics manufacturing (for tasks such as writing waveguides [9]), and industrial applications like direct welding of glass and metal [10]. Integrated intensity Mach-Zehnder modulator (MZM) represents a powerful means for externally modulating the optical signal and can also be used for suppressing a steady harmonic mode-locked pulse.…”

Section: Introductionmentioning

confidence: 99%

10 Hz Stable Mode-locked Er-Fiber Laser

2023

JJP

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In this paper, a stable output at the reduction repetition rate from 80 MHz mode-locked Er-doped fiber laser (EDFL) was demonstrated by adjusting the operating point for external LiNbO3 Mach-Zehnder‎ electro-optic intensity modulator to suppress harmonic mode-locked pulses. More than 70% of the laser beam was launched into the external pigtail Mach-Zehnder intensity modulator using single mode fiber with collimating lens and fiber (ferrule connector) FC adapter. The optimum values of Mach-Zehnder modulator bias voltages V0 and Vπ (half wave voltage) which resulted in maximum and minimum laser output power to leave the modulator were found at 6.5 and 0.29 V, respectively. The best modulation was achieved for the RF modulating signal with an opening time of about 8 ns. For driving voltage equal to Vπ, a clean mode-locked pulse train was generated with a pulse shape and energy similar to the input pulse, albeit with a low repetition rate. The minimum repetition rate reached as low as 10 Hz, resulting in pulse energy and peak power of 0.32 nJ and 1.5 kW, respectively. Second-harmonic generation of the low repetition rate pulse train was also produced by using a PPLN crystal. This opens up the potential for using this laser in single photon detection experiments and as a seed laser for many applications. Keywords: Er-fiber laser, Passively mode-locked fiber laser, Nonlinear polarization rotation, Mach-Zehnder modulator, Fast electro-optic modulator. PACS: Fiber lasers, 42.55.Wd, Mode locking, 42.60.Fc.

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Fluorescence decay studies applying a CW femtosecond dye laser pumped ungated inverse time-correlated single photon counting system

Cited by 10 publications

References 49 publications

Spatial Extent of Random Laser Modes

Spatial Extent of Random Laser Modes

Stimulated Emission of Surface Plasmons at the Interface between a Silver Film and an Optically Pumped Dye Solution

10 Hz Stable Mode-locked Er-Fiber Laser

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