Page 1 of 2 12 LastLast
Results 1 to 10 of 16

Thread: A DIY Supercontinuum Laser

  1. #1
    Join Date
    Jul 2014
    Posts
    20

    Default A DIY Supercontinuum Laser

    Long time since I have posted in here, but I though you all might like this.

    A home-made Supercontinuum Laser on a budget.

    This produces coherent light from 430nm all the way to 670nm as a continuous glorious spectrum!



    There will be a follow up video on generating frequency combs as well!

  2. #2
    Join Date
    Jan 2015
    Location
    switzerland
    Posts
    175

    Default Premier test avec une fibre monomode de 50 m

    Quote Originally Posted by plazmatron View Post
    Il y a longtemps que je n'ai pas posté ici, mais je pensais que vous pourriez tous aimer ça.

    Un supercontinuum laser fait maison à petit budget.

    Cela produit une lumière cohérente de 430 nm jusqu'à 670 nm sous la forme d'un spectre glorieux continu !



    Il y aura également une vidéo de suivi sur la génération de peignes de fréquences !
    Je vais sous peu publier mes résultats !

    Premier test avec une fibre monomode 9/125 de 50 mètres. J'attends une bobine de fibre de 1000 mètres. Pour l'instant je n'obtient pas le spectre rouge.
    http://s848664668.onlinehome.fr/Word...onomode-fiber/

    J'ai reçu aujourd'hui une fibre monomode de 1000 mètres de longueur. J'attends les coupleurs SMA
    Attached Thumbnails Attached Thumbnails 20221231_171848.jpg  

    20230108_180540.jpg  

    20230108_180950.jpg  

    20230108_174041 (1).jpg  

    20230108_103727.jpg  

    20230111_161320.jpg  

    20230111_161019.jpg  

    Last edited by femtoman; 01-11-2023 at 08:55.

  3. #3
    Join Date
    Jul 2014
    Posts
    20

    Default Nice

    Such a nice lab you have there!

    I have tested successfully with Stilbene-3 and Coumarin-1. The only difference between the two are where the spectrum starts, and the relative output power.

    Is the light well focused into the end of the fiber? (I don't see a lens in the photo) A 20x Microscope objective will do.

    I had no evidence of broadening with Rhodamine-6G

    Looking forward to your results!

    EDIT: Also, I see a coupler in the middle of the fiber, try without it first, you should see a result with just 50m of cable. Couplers are too lossy for this kind of work and can damage the fiber ends.

  4. #4
    mixedgas's Avatar
    mixedgas is offline Creaky Old Award Winning Bastard Technologist
    Infinitus Excellentia Ion Laser Dominatus
    Join Date
    May 2007
    Location
    A lab with some dripping water on the floor.
    Posts
    9,900

    Default

    With multimode fiber you might see Raman shifting. I have a Raman shifting fiber for my pulsed 532nm laser, I will have to dig it out and try it.

    Steve
    Qui habet Christos, habet Vitam!
    I should have rented the space under my name for advertising.
    When I still could have...

  5. #5
    Join Date
    Jan 2015
    Location
    switzerland
    Posts
    175

    Laser Warning Supercontinuum with a multimode fiber 50/125 micron with dye coumarine 3 laser

    Supercontinuum avec une fibre multimode 50/125 micron à colorant coumarine 3 laser

    http://s848664668.onlinehome.fr/Wordpress/2022/12/31/generation-of-continuum-with-coumarine-dye-laser-in-100- mètres-9-125-fibre-monomode/
    Attached Thumbnails Attached Thumbnails 20230112_162940.jpg  

    20230112_163103.jpg  

    20230112_163216mod.jpg  

    20230113_143302 (2).jpg  

    20230112_164817.jpg  

    20230112_163216.jpg  

    20230113_143344.jpg  

    Last edited by femtoman; 01-13-2023 at 08:51.

  6. #6
    Join Date
    Oct 2010
    Posts
    41

    Default

    Very nice work.

    Are you guys having any informations on how long/how much power your input pulse has?
    And which wavelength?

    Seems like the continuum starts at the laser wavelength and broadens up to longer wavelengths, correct?

  7. #7
    Join Date
    Jul 2014
    Posts
    20

    Default

    Quote Originally Posted by Farbe View Post
    Very nice work.

    Are you guys having any informations on how long/how much power your input pulse has?
    And which wavelength?

    Seems like the continuum starts at the laser wavelength and broadens up to longer wavelengths, correct?
    The input power is around 10 - 20uJ in 2.4 nanosecond (about 5-8kW peak) though I have yet to accurately measure this (sensors are in the post!)

    The primary mechanisms are Cascaded Stimulated Raman Scattering (SRS) and Self Phase Modulation (SPM). The output wavelengths are always longer than the input wavelengths, so when I designed the original experiment, I chose a dye with a wavelength as close to 400nm as I could, to try and cover the whole visible spectrum. In this case the dye Stilbene-3 (peak at 426nm) was used.

  8. #8
    Join Date
    Jan 2015
    Location
    switzerland
    Posts
    175

    Default Mesure de la puissance laser à colorant.

    J'ai fais une mesure du laser à colorant COUMARINE 3 à 0.001 Mol avec un microjoulemètre de MOLECTRON 450mV/mJ ce qui me donne 160 uJ pour le laser à azote TE avec un pulse de 2.5 ns et pour le laser à colorant 10uJ et 2.5 ns.
    J'estime que 5 à 10 % de la lumière rentre dans la fibre (je vais faire des mesures d'ici quelques jours)
    Attached Thumbnails Attached Thumbnails 20230117_110023.jpg  

    20230117_105927modf.jpg  

    20230117_111038.jpg  

    20230117_110055.jpg  

    20230117_105936.jpg  


  9. #9
    Join Date
    Jan 2023
    Posts
    9

    Default

    Wow it looks really great!

  10. #10
    Join Date
    Jul 2014
    Posts
    20

    Default An update ! Mutimode Fiber




    Supercontinuum using Multimode Fiber.

    My guess on Soliton fission in the video is wrong by the way! The brilliant combs in the video are caused by Cascaded Stimulated Raman Scattering (CSRS) alone.
    You don't see the comb in singlemode Fiber, because Self Phase Modulation smooths them out(probably!).

    There are measurements in the video (powers, pulse widths etc), as well as beautiful beam shots! Enjoy!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •