A frequency doubled gain switched Yb<sup>3+</sup>-doped fiber laser

Sintov, Yoav; Katz, M.; Blau, Pinhas; Glick, Yaakov; Lebiush, E.; Nafcha, Yehuda

doi:10.1117/12.808960

Cited by 7 publications

(8 citation statements)

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“…This increases the complexity and the cost of the laser significant. A more cost-effective solution would be to generate gain-switched pulses with a moderate pump power and then amplify them in a large mode area fiber amplifier [7,16,17].…”

Section: Discussionmentioning

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: Discussionmentioning

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 have therefore demonstrated a low record FWHM bandwidth of 0.1 nm and a record pulse duration of 66 ns with 150 µJ of absorbed pump energy, however the spectral quality is poor with a B90 of 1 nm. For the absorbed energy of 77 µJ a much better spectral quality is achieved and still with a low FWHM bandwidth of 0.1 nm and a pulse duration of 135 ns, which is only slightly longer than in [16]. Our smaller bandwidth can be attributed to that the study in [16] used a LR grating with twice the bandwidth and about three times smaller reflectance.…”

Section: Gain-switching Of the Fiber Lasermentioning

confidence: 79%

“…Realizations of Yb-doped gain-switched fiber lasers in the literature have reached pulses with energy of 16 µJ and 125 ns duration contained in a FWHM bandwidth of 0.2 nm (B90 is approximately 0.4 nm) [16] and longer pulses of 200 ns duration with energy of 150 µJ and FWHM bandwidth of 0.4 nm [11]. We have therefore demonstrated a low record FWHM bandwidth of 0.1 nm and a record pulse duration of 66 ns with 150 µJ of absorbed pump energy, however the spectral quality is poor with a B90 of 1 nm.…”

Section: Gain-switching Of the Fiber Lasermentioning

confidence: 99%

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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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“…A broad absorption band is another important advantage. It gives several alternative capabilities of choos− ing the pump wavelength [9][10][11][12][13]. One of the popular pum− −ping approaches is to use a fibre laser operating in a 1560-1570 nm range.…”

Section: Introductionmentioning

confidence: 99%