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Selecting Pulses in Ultrafast Ti:Sapphire Regenerat>2154_word_end974_word_end< using a >2120_word_end<

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1 Selecting High-Energy Pulses from Ultrafast Regenerat>2154_word_end974_word_end<

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Adding single-pass amplifiers to an ultrafast oscillator seed source, for example using a Chirped Pulse Amplification (C>702_word_end<) design, enables pulse energies of microjoules (μJ) can be obtained at 10s to 100s of kilohertz. However, there are many scientific and some industrial applications that require millijoules (mJ). To boost the energy of ultrafast laser- systems, multi-pass amplifiers are used.

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An example of how a Faraday rotator using 8 mm of Terbium Gallium Garnet (TGG) can affect the pulse duration of ~ 800 nm ultrashort pulses over the range from 10 – 10,000 fs, is shown in Figure 2. The graph was generated by determining how much group velocity dispersion (GVD) occurs for 800 nm pulses. This was done using the Sellmeier Equation for TGG>2130_word_end 2154_word_end<> 2154_word_end<> 2154_word_end< class="image aem-GridColumn aem-GridColumn--default--12"> 2154_word_end< data-cmp-is="image" data-cmp-lazythreshold="0" data-cmp-src="/en/web-resources/solution-brief/eot-faraday-rotator-sb/_jcr_content/root/container/container/layout_1050338460/par/column_1325421812_co/par/column_1325421812_co/par/image_549869968.coreimg{.width}.jpeg/1719347078877/eoc-iso-uf-fiber-laser-tgg.jpeg" data-asset="/content/dam/coherent/site/en/images/photography/solution-briefs/feedback-prevention-in-optical-fiber-based-ultrafast-lasers-using-eoc-optical-isolators/eoc-iso-uf-fiber-laser-tgg.jpg" data-asset-id="0e1af8e9-2c97-40c4-9909-291540cdf243" id="image-d92f84b7bc" class="cmp-image" itemscope itemtype="https://schema.org/ImageObject"> 2154_word_end< class="image-medium"> 2154_word_end<> 2154_word_end<> 2154_word_end<> 2154_word_end< class="column aem-GridColumn aem-GridColumn--default--12"> 2154_word_end< data-cmp-is="columns"> 2154_word_end< class="wrapper"> 2154_word_end< class="row"> 2154_word_end< class="col col-12 col-sm-9"> 2154_word_end< class="aem-Grid aem-Grid--12 aem-Grid--default--12 "> 2154_word_end< class="text aem-GridColumn aem-GridColumn--default--12"> 2154_word_end< id="text-03c74954a4" class="cmp-text">

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>2173_word_end<^nd der>2154_word_end2154_word_end2154_word_end2, the second-order group delay dispersion), related to GVD by multiplying GVD by the length of the material – in this case, the TGG used in the rotator. This information can in turn be used to calculate the output pulse duration for g>2154_word_end0 ² , is much less than β₂, an equation to express the 바카라사이트 신고 broadening proportional to β₂ can be used^v.

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By performing these calcula바카라사이트 신고ons, the amount of dispersion, β₂, over the range of 800 nm was found to be ~ 1500 fs² for 8 mm long TGG. The estimated broadening from that amount of second order dispersion for pulses in the range of 10 – 10,000 fs is shown in the graph below. Note that for pulses 75 fs, pulse broadening is not an issue. However, for many regenerat>2154_word_end 2154_word_end<> 2154_word_end<> 2154_word_end< class="image aem-GridColumn aem-GridColumn--default--12"> 2154_word_end< data-cmp-is="image" data-cmp-lazythreshold="0" data-cmp-src="/en/web-resources/solution-brief/eot-faraday-rotator-sb/_jcr_content/root/container/container/layout_1050338460/par/column_1325421812_co/par/column_1325421812_co/par/image_1062730886.coreimg{.width}.jpeg/1719347078924/eoc-iso-uf-fiber-laser-figure-3.jpeg" data-asset="/content/dam/coherent/site/en/images/photography/solution-briefs/feedback-prevention-in-optical-fiber-based-ultrafast-lasers-using-eoc-optical-isolators/eoc-iso-uf-fiber-laser-figure-3.jpg" data-asset-id="d3936129-5c4e-478a-9287-5ffbe434df17" data-title="eoc-iso-uf-fiber-laser-figure-3.jpg" id="image-037fadc720" class="cmp-image" itemscope itemtype="https://schema.org/ImageObject"> 2154_word_end< class="image-medium"> 2154_word_end<> 2154_word_end<> 2154_word_end<> 2154_word_end< class="column aem-GridColumn aem-GridColumn--default--12"> 2154_word_end< data-cmp-is="columns"> 2154_word_end< class="wrapper"> 2154_word_end< class="row"> 2154_word_end< class="col col-12 col-sm-9"> 2154_word_end< class="aem-Grid aem-Grid--12 aem-Grid--default--12 "> 2154_word_end< class="text aem-GridColumn aem-GridColumn--default--12"> 2154_word_end< id="text-c4f1e54a2b" class="cmp-text">

Figure 3: Broadening of a femtosecond pulse at ~ 1050 nm after propagation through 8 mm of TGG (blue curve); the red curve shows the output for undistorted pulses.

 

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5 Conclusions

When designing ultrafast laser systems with regenerat>2154_word_end

Contact us for more informa바카라사이트 신고on on how to use Coherent Faraday rotators in your ultrafast fiber laser systems.

 

References:

i Coherent User Manual for Faraday Rotators and Isolators

>2130_word_end< C. Barty, T. Guo, C. Le Blanc, F. Raksi, C. Rose-Petruck, J. Squier, A.Tian, K. Wilson, V.Yakovlev, and K. Yamakawa, ”Generation of 18-fs, multiterawatt pulses by regenerat>2154_word_end
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Schedule a no-cost consulta바카라사이트 신고on to discuss your needs.

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