High-peak-power pulse amplification in SM fibers

Savage-Leuchs, Matthias; Stafford, Ryan; Borschowa, Larry; Bowers, Mark S.

doi:10.1117/12.529639

Cited by 2 publications

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“…This results in a robust system with a stable output as will be described below. OSuB4.pdf rate that the Ophir pyroelectric energy meter can handle, however it is well known [2,5] that at higher rep rates the ASE decreases. The slope efficiency of the two combined stages is 0.42.…”

Section: Source Designmentioning

confidence: 98%

“…In these sources [1-3] although the amplification was produced in the fibers, the pump power is introduced into the fibers through bulk dichroic optics, typically from the signal output side of the fiber. Strictly-all-fiber configurations have been reported in the past [4,5]. A Q-switched ring fiber oscillator with an additional amplifier [4] produced 20nsec pulses with peak powers of 2kW.…”

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Strictly-all-fiber 1.55μm high peak power high average power source in a side coupled pump configuration

Glick¹

2006

Optical Amplifiers and Their Applications/Coherent Optical Technologies and Applications

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A high peak power source of 94kW, 0.49mJ/pulse and high average power of 7.3W is presented. This is evidently the highest peak power reported in a strictly-all-fiber source at Erbium eyesafe wavelengths in the nsec regime. OverviewSources capable of providing high peak power pulses and high average power in the nanosecond regime at eye-safe wavelengths are attractive for many applications such as remote sensing, free space communications, medicine and laser marking. Peak powers of up to 130kW at around 1.5 m in nsec pulses have been produced from fiber amplification setups [1,2]. In another work [3], the researchers produced 500kW peak powers, with pulses in the psec regime. In these sources [1-3] although the amplification was produced in the fibers, the pump power is introduced into the fibers through bulk dichroic optics, typically from the signal output side of the fiber. Strictly-all-fiber configurations have been reported in the past [4,5]. A Q-switched ring fiber oscillator with an additional amplifier [4] produced 20nsec pulses with peak powers of 2kW. In another work a master oscillator power amplifier (MOPA) architecture was employed [5] and a peak power of 13kW was produced in SM fibers. To the best of our knowledge the nearly 100kW peak power reported in this study is the highest peak power reported to date from a strictly-all-fiber source (laser or amplifier) at 1.5 m eye-safe wavelengths in the nsec regime.In a strictly-all-fiber setup, the pump itself is fiber-coupled and is introduced into the active fiber in a side coupling configuration without the need of any bulk optics in a manner similar to that described in ref.[6]. The pump power here is side coupled into the active fiber using a method developed in-house, in which a pump coupling efficiency of over 90% is achieved [7]. The side coupling configuration is effectively similar to standard telecommunication pump combiners in which the pump is coupled into the accepting fiber in a 2 x 1 (2 input 1 output) fiber configuration. This sort of configuration is less susceptible to misalignment and mechanical vibrations since at all locations in the system, from the pump till the output, the light is inside the fibers. As a result, the output power and energy can be remarkably stable. In addition, this also permits a flexibility of the external dimensions and a low weight and size. This in turn facilitates the integration into potential field systems.In addition, the 7.3W average power reported here is the highest average power in a high peak power (>50kW) 1.5 m eye-safe wavelength fiber source, at high peak power working points. In the above referenced works [1,2], the highest average power at high peak power working points is 0. 3W and 4W respectively, and <0.1W in refs [3-5]. Our combination of high peak power and high average power represents a unique performance. Source DesignA schematic of the design is shown in figure 1. The source is composed of a DFB diode laser at 1550nm which is modulated at the desired rep-rate (15kHz). The output of this...

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Section: Source Designmentioning

confidence: 98%

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confidence: 99%