کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7930451 | 1512587 | 2015 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Direct fluorescence characterisation of a picosecond seeded optical parametric amplifier
ترجمه فارسی عنوان
خصوصیات فلوئورسانس مستقیم یک آمپلی فایر پارامتری نهال بذر پیکاسونیک
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کلمات کلیدی
تقویت پارامتر نوری، فلورسانس پارامتری، پالس کنتراست زمانگرا،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
چکیده انگلیسی
The temporal intensity contrast of high-power lasers based on optical parametric amplification (OPA) can be limited by parametric fluorescence from the non-linear gain stages. Here we present a spectroscopic method for direct measurement of unwanted parametric fluorescence widely applicable from unseeded to fully seeded and saturated OPA operation. Our technique employs simultaneous spectroscopy of fluorescence photons slightly outside the seed bandwidth and strongly attenuated light at the seed central wavelength. To demonstrate its applicability we have characterised the performance of a two-stage picosecond OPA pre-amplifier with 2.8Ã105 gain, delivering 335μJ pulses at 1054 nm. We show that fluorescence from a strongly seeded OPA is reduced by ~500à from the undepleted to full pump depletion regimes. We also determine the vacuum fluctuation driven noise term seeding this OPA fluorescence to be 0.7±0.4 photons psâ1 nmâ1 bandwidth. The resulting shot-to-shot statistics highlights a 1.5% probability of a five-fold and 0.3% probability of a ten-fold increase of fluorescence above the average value. Finally, we show that OPA fluorescence can be limited to a few-ps pedestal with 3Ã10â9 temporal intensity contrast 1.3 ps ahead of an intense laser pulse, a level highly attractive for large scale chirped-pulse OPA laser systems.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optics Communications - Volume 336, 1 February 2015, Pages 319-325
Journal: Optics Communications - Volume 336, 1 February 2015, Pages 319-325
نویسندگان
N.H. Stuart, D. Bigourd, R.W. Hill, T.S. Robinson, K. Mecseki, S. Patankar, G.H.C. New, R.A. Smith,