Zero-dispersion wavelength independent quasi-CW pumped supercontinuum generation

Larsen, Casper; Sørensen, Simon Toft; Noordegraaf, Danny; Hansen, Kristoffer Lindskov; Mattsson, Kent Erik; Bang, Ole

doi:10.1016/j.optcom.2012.10.030

Cited by 16 publications

(11 citation statements)

References 40 publications

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“…The output pulse energies are often in the microjoule range and with repetition rates spanning from a few kilohertz up to the megahertz range [2,5]. These properties make the gain-switched fiber lasers interesting for many applications; directly or after single-stage amplification in high-power fiber amplifiers [1,2,6,7].…”

Section: Introductionmentioning

confidence: 99%

The all-fiber cladding-pumped Yb-doped gain-switched laser

Larsen¹,

Hansen²,

Mattsson³

et al. 2014

Opt. Express

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Abstract:Gain-switching is an alternative pulsing technique of fiber lasers, which is power scalable and has a low complexity. From a linear stability analysis of rate equations the relaxation oscillation period is derived and from it, the pulse duration is defined. Good agreement between the measured pulse duration and the theoretical prediction is found over a wide range of parameters. In particular we investigate the influence of an often present length of passive fiber in the cavity and show that it introduces a finite minimum in the achievable pulse duration. This minimum pulse duration is shown to occur at longer active fibers length with increased passive length of fiber in the cavity. The peak power is observed to depend linearly on the absorbed pump power and be independent of the passive fiber length. Given these conclusions, the pulse energy, duration, and peak power can be estimated with good precision.

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Section: Introductionmentioning

confidence: 99%

The all-fiber cladding-pumped Yb-doped gain-switched laser

Larsen¹,

Hansen²,

Mattsson³

et al. 2014

Opt. Express

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“…We optimize the PED of our source by using high-pump pulse energy of 30 μJ and by using an SMF with a ZDW far below the pump. This means that a ns pulse will only generate spectral broadening above the pump wavelength [22], as is also seen in Fig. 2(b), and that the spectrum can be designed by an appropriate choice of the fiber length.…”

Section: High-pulse Energy Supercontinuum Laser Sourcementioning

confidence: 97%

High-pulse energy supercontinuum laser for high-resolution spectroscopic photoacoustic imaging of lipids in the 1650-1850 nm region

Dasa¹,

Markos²,

Maria³

et al. 2018

Biomed. Opt. Express

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We propose a cost-effective high-pulse energy supercontinuum (SC) source based on a telecom range diode laser-based amplifier and a few meters of standard single-mode optical fiber, with a pulse energy density as high as ~25 nJ/nm in the 1650-1850 nm regime (factor >3 times higher than any SC source ever used in this wavelength range). We demonstrate how such an SC source combined with a tunable filter allows high-resolution spectroscopic photoacoustic imaging and the spectroscopy of lipids in the first overtone transition band of C-H bonds (1650-1850 nm). We show the successful discrimination of two different lipids (cholesterol and lipid in adipose tissue) and the photoacoustic cross-sectional scan of lipid-rich adipose tissue at three different locations. The proposed high-pulse energy SC laser paves a new direction towards compact, broadband and cost-effective source for spectroscopic photoacoustic imaging.

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“…Output pulse energies are typically in the tens to hundreds of microjoule range and with nanosecond pulse duration [9][10][11]. An example of an application is within supercontinuum generation [11], where the increased peak power reduces the dependence on the zero dispersion wavelength [12]. One downside of gain-switching is that the full capacity of the pump lasers is not utilized due to the pulsed pumping.…”

Section: Introductionmentioning

confidence: 99%

Gain-switched all-fiber laser with narrow bandwidth

Larsen¹,

Giesberts²,

Nyga³

et al. 2013

Opt. Express

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Abstract:Gain-switching of a CW fiber laser is a simple and costeffective approach to generate pulses using an all-fiber system. We report on the construction of a narrow bandwidth (below 0.1 nm) gain-switched fiber laser and optimize the pulse energy and pulse duration under this constraint. The extracted pulse energy is 20 µJ in a duration of 135 ns at 7 kHz. The bandwidth increases for a higher pump pulse energy and repetition rate, and this sets the limit of the output pulse energy. A single power amplifier is added to raise the peak power to the kW-level and the pulse energy to 230 µJ while keeping the bandwidth below 0.1 nm. This allows frequency doubling in a periodically poled lithium tantalate crystal with a reasonable conversion efficiency.

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Zero-dispersion wavelength independent quasi-CW pumped supercontinuum generation

Cited by 16 publications

References 40 publications

The all-fiber cladding-pumped Yb-doped gain-switched laser

The all-fiber cladding-pumped Yb-doped gain-switched laser

High-pulse energy supercontinuum laser for high-resolution spectroscopic photoacoustic imaging of lipids in the 1650-1850 nm region

Gain-switched all-fiber laser with narrow bandwidth

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