Page 6 of 12 FirstFirst ... 2345678910 ... LastLast
Results 51 to 60 of 111

Thread: 445nm diode info

  1. #51
    Join Date
    Feb 2010
    Location
    Melbourne, Australia
    Posts
    1,106

    Default

    Hi Jerry,

    Thanks very much for those figures Do you by any chance happen to have any corresponding temperature figures? I'm wondering how effective that heatsink is at higher mW outputs without a TEC and or fan.

  2. #52
    Join Date
    Dec 2008
    Location
    Canada
    Posts
    972

    Default

    I've had it run for about 15 minutes at over 800mW and the
    heat sink only gets warm to the touch... I'm thinking of installing
    a small CPU fan on it..

    Jerry
    See the LaserBee II and all other LaserBee LPM products here....
    All LaserBee Laser Power Meter Products

    New 3.2Watt RS232/USB LaserBee II LPM REVIEW


    Always in stock and ready to ship....
    Subsidary:-Pharma Electronic Solutions

  3. #53
    Join Date
    Jan 2009
    Posts
    1,622

    Default

    At similar powers I found that a fan was required. The z-bolt heatsink accepts 40mm fans..

  4. #54
    Join Date
    Nov 2007
    Location
    Bend Oregon USA
    Posts
    3,350

    Default

    Quote Originally Posted by ElektroFreak View Post
    At similar powers I found that a fan was required. The z-bolt heatsink accepts 40mm fans..
    *scratches chin... I got to get me one of them things.
    Pat B

    laserman532 on ebay

    Been there, done that, got the t-shirt & selling it in a garage sale.

  5. #55
    Join Date
    Mar 2006
    Location
    Ottawa, Ontario, Canada
    Posts
    494

    Laser Warning

    Quote Originally Posted by RedlumX View Post
    I did this today, see the little movie that shows the mode spectrum when the current is ramped from threshold to approx 260mA; note the beautiful single mode zone at 224mA:
    http://pagesperso-orange.fr/redlum.x...reerunning.MOV

    Included is also sound that shows the noise in the light output. The popping sounds at the beginning indicate mode jumps. One can clearly hear how the single mode regions are correlated with low noise, which gives hope that a simple noise detector might be sufficient to determine the single mode regions (this is not so for other diodes).




    Indeed so, it's about the longitudinal modes. I found this surprising as, I believe, this is a multi-emitter diode and why all emitters should run at the same wavelength escapes me. The diode seems to behave like any other higher power red or 405nm diode in this respect. Perhaps there is some reason behind this. But first of all, more detailed and systematic studies are needed, in particular each diode is different and I know from the red diodes that different samples of the same model can behave very differently.
    You have a nice setup there. Have you tried using a TEC to keep the diode temp stable?
    I suspect you will get higher power single mode operation If you do so
    Profile Redacted by Admin @ 04.24.2010

  6. #56
    Join Date
    Jan 2006
    Location
    Switzerland
    Posts
    129

    Default

    Quote Originally Posted by LaserLover View Post
    Have you tried using a TEC to keep the diode temp stable?
    Of course - otherwise meaningful measurements can't be made, the thing would mode hop faster than one could see any clear picture. But to stabilize it to within a few thousands of a degree for a longer term is pretty tough, as the power dissipation is much higher than for the red diodes, and probably I need to spice up my Tec drivers.

  7. #57
    Join Date
    Mar 2006
    Location
    Ottawa, Ontario, Canada
    Posts
    494

    Laser Warning

    Quote Originally Posted by RedlumX View Post
    Of course - otherwise meaningful measurements can't be made, the thing would mode hop faster than one could see any clear picture. But to stabilize it to within a few thousands of a degree for a longer term is pretty tough, as the power dissipation is much higher than for the red diodes, and probably I need to spice up my Tec drivers.
    At what temperature did you take the readings ?
    Profile Redacted by Admin @ 04.24.2010

  8. #58
    Join Date
    Jan 2006
    Location
    Switzerland
    Posts
    129

    Default

    Quote Originally Posted by LaserLover View Post
    At what temperature did you take the readings ?
    You mean for the movie? I guess that was around 16C. But in general the single mode zones depend strongly on the temperature and the particular diode as well, so one needs to make systematic current/temperature scans for each diode separately, to find its single mode spots.

  9. #59
    Join Date
    Dec 2008
    Location
    Canada
    Posts
    972

    Default

    I just did a test on the A140 445nm LD I got from Dan...
    I installed it into an Aixiz Module using the same 405 G-1 lens
    I used to test the A130 in Post #51 of this Thread..
    It is also mounted in a Z-Bolt clam shell heat sink..

    Here are my results...
    I tested in 100mW increments and stopped at 1500mW..
    I used an Opto Power Corporation OPC-PS4005 Laser
    Diode Driver and our Newport 1825C LPM with a Thermopile
    Sensor as the last test.

    It is to be noted that on both tests the resolution of the
    current was limited to 10mA so the readings indicated could
    be 1 to 9 mA more...

    Starts lasing @ 3.77V -- 7mW

    050mW ---- 260mA ---- 3.82V
    100mW ---- 300mA ---- 3.87V
    200mW ---- 370mA ---- 3.95V
    300mW ---- 440mA ---- 4.02V
    400mW ---- 510mA ---- 4.08V
    500mW ---- 580mA ---- 4.13V
    600mW ---- 650mA ---- 4.17V
    700mW ---- 720mA ---- 4.21V
    800mW ---- 790mA ---- 4.25V
    900mW ---- 880mA ---- 4.28V
    1000mW -- 960mA ---- 4.31V
    1100mW -- 1050mA --- 4.34V
    1200mW -- 1150mA --- 4.36V
    1300mW -- 1260mA --- 4.39V
    1400mW -- 1380mA --- 4.42V
    1500mW -- 1570mA --- 4.45V


    The readings are a bit different from my A130 test... but that could
    also be due to perhaps the A130 was a low end binned LD or the
    A140 was an extremely high end binned LD...

    To really know if the A140 LD are better we need more tests by
    other members... The tests I performed are not destructive... and can
    be done by anyone that has an LPM and DMM...
    These tests will not blow your 445nm Laser Diode if you keep the tests
    under 1200mW and follow a few standard safety measures... IMO

    Once I find more time and more 445nm LDs I'll do some more of these
    tests to get a better Average Idea of what these LDs are..


    Jerry
    Last edited by lasersbee; 07-03-2010 at 12:40. Reason: Value Correction
    See the LaserBee II and all other LaserBee LPM products here....
    All LaserBee Laser Power Meter Products

    New 3.2Watt RS232/USB LaserBee II LPM REVIEW


    Always in stock and ready to ship....
    Subsidary:-Pharma Electronic Solutions

  10. #60
    Join Date
    Oct 2006
    Location
    Central Florida
    Posts
    7,067

    Thumbs up Only pictures or a video would have made that better...

    Quote Originally Posted by lasersbee View Post
    I just did a test on the A140 445nm LD I got from Dan...
    I installed it into an Aixiz Module using the same 405 G-1 lens
    I used to test the A130 in Post #51 of this Thread..
    It is also mounted in a Z-Bolt clam shell heat sink..

    Here are my results...
    I tested in 100mW increments and stopped at 1500mW..
    I used an Opto Power Corporation OPC-PS4005 Laser
    Diode Driver and our Newport 1825C LPM with a Thermopile
    Sensor as the last test.

    It is to be noted that on both tests the resolution of the
    current was limited to 10mA so the readings indicated could
    be 1 to 9 mA more...

    Starts lasing @ 3.77V -- 7mW

    050mW ---- 260mA ---- 3.82V
    100mW ---- 300mA ---- 3.87V
    200mW ---- 370mA ---- 3.95V
    300mW ---- 440mA ---- 4.02V
    400mW ---- 510mA ---- 4.08V
    500mW ---- 580mA ---- 4.13V
    600mW ---- 650mA ---- 4.17V
    700mW ---- 720mA ---- 4.21V
    800mW ---- 790mA ---- 4.25V
    900mW ---- 880mA ---- 4.28V
    1000mW -- 960mA ---- 4.31V
    1100mW -- 1050mA --- 4.34V
    1200mW -- 1150mA --- 4.36V
    1300mW -- 1260mA --- 4.39V
    1400mW -- 1380mA --- 4.42V
    1500mW -- 1570mA --- 4.45V

    The readings are a bit different from my A130 test... but that could
    also be due to perhaps the A130 was a low end binned LD or the
    A140 was an extremely high end binned LD...

    To really know if the A140 LD are better we need more tests by
    other members... The tests I performed are not destructive... and can
    be done by anyone that has an LPM and DMM...
    These tests will not blow your 445nm Laser Diode if you keep the tests
    under 12000mW and follow a few standard safety measures... IMO

    Once I find more time and more 445nm LDs I'll do some more of these
    tests to get a better Average Idea of what these LDs are..


    Jerry
    ...............

Posting Permissions

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