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    1550nm Laser

    I need high power(above 100mW) 1550nm low cost Laser.
    Can someone help me?

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    Seach:
    SONY SLDxxx, ROHM...
    In EU is supplier e.g.: wxw.lasercomponents.de
    Maybe try to search VCSEL diodes.

    For this power will be problem with speed of laser

    pool_77



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    I work with all kind of telecommunication lasers many years
    @1550 no any diode laser with power more than 30-40 mW
    it is technically impossible to get more with reasonable life time
    You need laser based on erbium doped fiber.
    Number of firms produce such kind of lasers, but take in account
    cost will be 20k$ or more



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    Goxy,

    Please define "low cost". You're looking
    at easily $40,000-50,000 or more. Will
    that fit your budget?

    Nick C.



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    I'm find that SONABEAM's free space communicator use 4x160mW 1550nm VCSEL diodes and cost about 10k$.
    That's mean one diode with 160mW power can't cost more than 1500$.
    It's too much for me, I need some diode about 500$.



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    Hey guys where are you?
    Number of firms produce such kind of lasers, but take in account
    cost will be 20k$ or more
    You're looking
    at easily $40,000-50,000 or more
    About what you are mean, on Laser Cannon?
    Let's post here yours lasers, I'm interesting what I'll get for 20-50k$.
    Are you mean that I need 100kW Laser?



  7. #7
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    You talk about 1550nm laser
    as far as I know most of InGaAs diode lasers
    intended for fiber telecommunication use.
    I never seen 1550nm laser for free space communication, sorry.
    1550nm is transparency window for fiber, but not for air
    so it seems very strange to use it.
    In all case, try to describe your project,
    and may be I'll can help you really.
    I work some years for JDSU laser division, one of
    biggest diode laser vendors in the word, so I familiar with
    diode lasers more or less.



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    I build low budget project with full price about 1000$ per one device like this : hxxp://www.fsona.com/product.php?sec=155m
    And 500$ for laser diode is too much for me, I'm very very bad with money.
    I'm find some laser diodes on 780, 875 and 1020nm for about 50-150$ with power about 50-150mW. This is so much money too, but I except that one day will be back. :D
    I try to find some laser diodes on 1550nm for small difference in prices (about 200$ for one 100mW diode will be excellent price on this wavelength for me).



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    Why espesially 1550 ?
    Laser 1550 can't be cheaper than laser in 0.8 range by definition
    Most powerfull is VCSEL's, but historically, first was done 850 nm VCSEL
    after that 1300 and only few years ago 1550.
    Technology and materials for GaAs much cheaper than for InGaAs.
    BTW what is the bitrate needed ?
    Somethink like http://www.scd.co.il/laser_qcw.html cann't have high speed !
    In all case, look in JDSU direction, them not best one ,as a rule,
    but relatively cheap thanks to high volumes
    http://www.jdsu.com/index2.cfm?NAVCI...ID=12&C_ID=353



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    Thanks for links.
    Laser Diode 808-812 nm, 0.5-4.0 W from JDS and QCWLD-480 is good wavelenght, but very dangers lasers for eye, do you know prices?
    I try to find on 1550nm because eye safety.

    I'm not sure that I can order small quantity (1-5) lasers from this manufactures.



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    Any laser more than 20-30 mW dangerous for eye !
    And more than 60-70 mW even for skin .
    So in all case you must work very carefully, no any reflective objects on working table etc. It is serious ! I know number of peoples that lost their eye thanks to accidental reflection.
    As far as I know - to buy 2-3 lasers will not a problem,
    nobody not buy at once 1000 witout sample testing !
    If you need not more than 150-200 mW of power @0.8 range
    real price will be 30-150 $ mostly depend of packaging.
    Unpackaged sandwich (only laser between 2 copper heatsinks) = 30-50$
    but you'll need active cooling, I meen termoelectrical cooling with appropriate thermal capacity ( Melcor for example, approx. 20-30 buks) and some electronics for driving of course. As a rule uncollimated laser
    light is unusable, beam profile for diode laser is cone with 3-5 degree
    @ top, and try to calculate what your reciever will get after 200-300m !
    A few nanowatts (if not pico-!). So for real working open space communication line you'll need 2 telescopes (collimators) for laser and for reciever with max. achievable aperture... and lenses with 15-20 sm
    diameter will be, I think, most expensive part of project.
    Also you will need narrowband optical filter for your reciever
    to avoid sunlight that have enough power @0.8 mkm, it's price 10-15$
    but it hard to get, becouse most of filters is customize devices so
    as a rule it is not "on shelf" product.
    I not meen that such project is unreal, I try to show you possible buttlenecks!



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    Thanks Jourval!

    I think that laser ray can be reflect from wall (no need mirror or glass) and will be dangerous. What minimal safety power or do you know coefficient of reflection in this case?
    You are in right for narrowband optical filter, where you find this price(10-15$)?



  13. #13
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    The best way (and simplest) for laser safety is to fix laser on the
    table and build "trap" for laser beam from bricks, ceramic plates
    or tube (best !)
    or something like, that cann't fire and have diffusive reflection.
    By the way I think that reflection from walls is not actually dangerous
    thanks to high beam expansion and diffusive reflection
    of standart wall coating, but let's not check this clame
    For the first experiments you can use optical filter from any
    old VCR with IR remote control it is not best solution, but better
    than nothing. Collimator could be build with plastic lenses
    that much cheaper, but for 0.8mkm will be well enough.
    For example relatively big plastic magnifier glass for reading
    will cost about nothing.



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