[labnetwork] Fianium WhiteLase SC-400-4 supercontinuum fiber laser…4 W

[Prashant Srinivasan]

Hi Michael,


  Do you mean intermittent electronic turn-on, or intermittent optical 
power? A SCL is a multi-stage system. Typically looks like this:


Seed laser (say 1550 nm) -->Pre-Amp-->Bandpass filter-->High power 
Isolator-->Double clad power Amp-->Nonlinear fiber for SC generation


Each amplifier stage is pumped by another laser diode (say 980nm) and 
should have active back-reflection monitoring. The laser will not fire 
if there is no seed light. Please email pictures of the insides when you 
get a chance.


On 12/3/2025 7:45 AM, Johnson, Michael W wrote:
> It worked fine optically until the problem started.
>
> Problem started with it would power up briefly and then quickly go 
> dark. Grad student bought a replacement power supply in hopes that 
> this would solve the issue. This did not provide improvement. Now the 
> behavior is worse in that laser is completely unresponsive. Totally dark.
> Could be as simple as loose wire inside head where DC power comes in. 
> Could be a bad board. Could be a failed capacitor somewhere in it. 
> Going on 12 years old.
>
> I will likely open it up in the next week to investigate.
>
> The cord between power supply and laser head has two larger conductors 
> for DC power and 5 smaller conductors. I would like to know if there 
> is a logic connection between head and power supply via these smaller 
> wires or if the power supply is "dumb".
> Do these smaller wires perform any function or is this 7 pin (or 2 +5 
> pin) connector some interesting standard that I have not before 
> encountered?
>
> This problem just fell in my lap yesterday.
>
> -Michael.
> ------------------------------------------------------------------------
> *From:* Prashant Srinivasan <prashant at ucsb.edu>
> *Sent:* Wednesday, December 3, 2025 9:25 AM
> *To:* labnetwork at mtl.mit.edu <labnetwork at mtl.mit.edu>; Johnson, 
> Michael W <mjohnso6 at tulane.edu>
> *Subject:* Re: [labnetwork] Fianium WhiteLase SC-400-4 supercontinuum 
> fiber laser…4 W
>
> 	
>
> External Sender. Be aware of links, attachments and requests.
>
> What is wrong with it? What are the symptoms? Issue with the driver 
> (electronics), burnt fiber, dead pump diode?
>
>
> On 12/2/2025 3:41 PM, Johnson, Michael W wrote:
>> Does anyone have a repair option for a 2014 vintage NKT Photonics 
>> Fianium WhiteLase SC-400-4 supercontinuum fiber laser…4 W?
>>
>> The manufacturer has done an end of life on it and will no longer 
>> support it. Obsolete.
>>
>> Sometimes these companies have ex employees that open a shop to 
>> service older gear.
>>
>> Can't get schematics from the company.
>>
>> Any leads would be appreciated.
>>
>> -Michael.
>> Tulane University
>> TINI
>>
>>
>>
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> -- 
> Prashant Srinivasan,
> Teaching Cleanroom Manager
> Department of Electrical and Computer Engineering
> University of California Santa Barbara
> Santa Barbara, CA 93106
> https://www.ece.ucsb.edu/department-resources/electronics-shop/tcr <https://www.ece.ucsb.edu/department-resources/electronics-shop/tcr>

-- 
Prashant Srinivasan,
Teaching Cleanroom Manager
Department of Electrical and Computer Engineering
University of California Santa Barbara
Santa Barbara, CA 93106
https://www.ece.ucsb.edu/department-resources/electronics-shop/tcr
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