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TIDA-01573: About laser diodes, and adjustment of pulses

mayumi.T
Expert 1015 points
Part Number: TIDA-01573
Other Parts Discussed in Thread: LMG1020

Hello,

My customer has a question about TIDA-01573.

This product can pulse operation for 1 nsec on the order of 100 W,
Is it possible to set the output power to about 150 mW using the attached laser diode (SPL PL 90 _ EN)?
The output pulse gives about 40 nsec.
In this case, what kind of parts should my customer adjust?
Could you teach us?

Thank you.

SPL PL90_EN.pdf

  • 0
    TI__Genius 12990 points

    Hi mayumi,

    Thanks for your interest in this TIDA. Im an apps eng with LMG1020 and will help answer.

    You can limit the current seen by the diode by populating R5-R8 with a limiting resistance which prevents excessive current to flow.

    150mW is small, is this an average power requirement? what peak power do you want? is your target pulse width 40ns?

    Thanks,

  • 0 in reply to Jeffrey Mueller
    Expert 1015 points

    Hello,Jeffrey

    Thank you for your reply.

    Sorry, my customer changed the value of the question.

    Power : 150 mW → 1 mW

    The pulse width of the target is 40 nsec. (1 mW output at pulse 40 nsec)

    >>what peak power do you want?

    He says he does not know the maximum power.

    They want to test on the desk whether the laser output from TIDA - 01573 can be received by irradiating the laser receiver.

    Because the distance on the desk is about 1m, they think that the output is too large at 150 mW.

    Is it possible with TIDA-01573?

    I would be pleased if you give me advice.

    Thank you.

    Mayumi

  • 0 in reply to mayumi.T
    TI__Genius 12990 points

    Thanks !

    Whats your  laser voltage?

    What application is this?

    1m is no problem for this Evm. A small current will be needed. What frequency does the laser need to be pulsed at?

  • 0 in reply to Jeffrey Mueller
    Expert 1015 points

    Hello,

    Thank you very much for replying.

    My customer's answer is as follows.

    【Answer to questions】


    · What will be the application?
    → My customer will use it as a testing machine for the receiver. (Used in their company)

    · What frequency is required for laser pulse?
    → 40 nsec / 80 msec = ON / OFF


    In addition to SPL_PL 90 _ EN previously attached, VSLY 3943 is also available as their choice. (Attached with data sheet)
    I think that 1 mW is possible because standard output power is low,
    It is saved if you can judge whether combination with TIDA - 01573 is possible.

    vsly3943.pdf

    Best Regards,

    Mayumi,

  • 0 in reply to mayumi.T
    TI__Genius 12990 points

    Hi Mayumi,

    Thanks for the update!

    You should have no problem achieving 1mW avg power for say a class1-2 laser for example with this TIDA/EVM.

    With high bus voltages its possible to achieve dozens of amps during the 40ns pulse.

    whats the bus voltage?

    what GaN fet is being used to switch the laser pulse?

    what will the testing machine be doing? whats the receiver end equipment?  

    Thanks,

  • 0 in reply to Jeffrey Mueller
    Expert 1015 points

    Hello,Jeffrey-san

    Thank you very much for your reply and confirmation.

    My customer's product is satisfactory if it meets Class 1.

    I would like to teach you,
    Is it SPL_PL 90 _ EN or VSLY 3943 that you confirmed?

    I have confirmed the following about my customers.
    · What GaN fet is being used to switch the laser pulse?
    → It is GaN FET (EPC 2019) listed in TIDA - 01573.

    Thank you.

  • 0 in reply to mayumi.T
    TI__Genius 12990 points
    Hi Mayumi,

    Thanks for your update,
    PL_90 or VSLY_3943 should work for you on the EVM.
    PL_90 might allow you to achieve brighter laser light due to its 3 stacked emitters.
    A 40ns pulse will give you a large peak power so eye safety needs to be accounted for before you power on the laser.
    Do you have any GaN driver related concerns?
    is your biggest concern the power loop inductance?

    Thanks,
  • 0 in reply to Jeffrey Mueller
    Expert 1015 points
    Hello, Jeffrey-san

    Thank you very much for your advice.
    My customer wanted to confirm before the purchase of TIDA whether the two diodes could satisfy the required specifications.
    There may be additional concerns after the evaluation, but for now there are no additional concerns heard from customers.

    Thank you.
    Mayumi