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<p>Hi Michael,</p>
<p><br>
</p>
<p> Do you mean intermittent electronic turn-on, or intermittent
optical power? A SCL is a multi-stage system. Typically looks like
this:</p>
<p><br>
</p>
<p>Seed laser (say 1550 nm) -->Pre-Amp-->Bandpass
filter-->High power Isolator-->Double clad power
Amp-->Nonlinear fiber for SC generation</p>
<p><br>
</p>
<p>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. </p>
<p><br>
</p>
<div class="moz-cite-prefix">On 12/3/2025 7:45 AM, Johnson, Michael
W wrote:<br>
</div>
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It worked fine optically until the problem started.</div>
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<br>
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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. </div>
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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.</div>
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<br>
</div>
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I will likely open it up in the next week to investigate. </div>
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<br>
</div>
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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".</div>
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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?</div>
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<br>
</div>
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This problem just fell in my lap yesterday.</div>
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<br>
</div>
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-Michael.</div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif"
style="font-size:11pt" color="#000000"><b>From:</b> Prashant
Srinivasan <a class="moz-txt-link-rfc2396E" href="mailto:prashant@ucsb.edu"><prashant@ucsb.edu></a><br>
<b>Sent:</b> Wednesday, December 3, 2025 9:25 AM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:labnetwork@mtl.mit.edu">labnetwork@mtl.mit.edu</a>
<a class="moz-txt-link-rfc2396E" href="mailto:labnetwork@mtl.mit.edu"><labnetwork@mtl.mit.edu></a>; Johnson, Michael W
<a class="moz-txt-link-rfc2396E" href="mailto:mjohnso6@tulane.edu"><mjohnso6@tulane.edu></a><br>
<b>Subject:</b> Re: [labnetwork] Fianium WhiteLase SC-400-4
supercontinuum fiber laser…4 W</font>
<div> </div>
</div>
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<p class="x_MsoNormal" style=""><span style="">External
Sender. Be aware of links, attachments and
requests.
</span></p>
</div>
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<p>What is wrong with it? What are the symptoms? Issue with
the driver (electronics), burnt fiber, dead pump diode?</p>
<p><br>
</p>
<div class="x_moz-cite-prefix">On 12/2/2025 3:41 PM, Johnson,
Michael W wrote:<br>
</div>
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Does anyone have a repair option for a 2014 vintage NKT
Photonics Fianium WhiteLase SC-400-4 supercontinuum fiber
laser…4 W?</div>
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<br>
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The manufacturer has done an end of life on it and will no
longer support it. Obsolete.</div>
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<br>
</div>
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Sometimes these companies have ex employees that open a
shop to service older gear.</div>
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<br>
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Can't get schematics from the company.</div>
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<br>
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Any leads would be appreciated.</div>
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<br>
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-Michael.</div>
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Tulane University </div>
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TINI</div>
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<br>
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<br>
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<br>
<fieldset class="x_moz-mime-attachment-header"></fieldset>
<pre class="x_moz-quote-pre">_______________________________________________
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</blockquote>
<pre class="x_moz-signature" cols="72">--
Prashant Srinivasan,
Teaching Cleanroom Manager
Department of Electrical and Computer Engineering
University of California Santa Barbara
Santa Barbara, CA 93106
<a class="x_moz-txt-link-freetext moz-txt-link-freetext"
href="https://www.ece.ucsb.edu/department-resources/electronics-shop/tcr"
originalsrc="https://www.ece.ucsb.edu/department-resources/electronics-shop/tcr"
moz-do-not-send="true">https://www.ece.ucsb.edu/department-resources/electronics-shop/tcr</a></pre>
</div>
</div>
</blockquote>
<pre class="moz-signature" cols="72">--
Prashant Srinivasan,
Teaching Cleanroom Manager
Department of Electrical and Computer Engineering
University of California Santa Barbara
Santa Barbara, CA 93106
<a class="moz-txt-link-freetext" href="https://www.ece.ucsb.edu/department-resources/electronics-shop/tcr">https://www.ece.ucsb.edu/department-resources/electronics-shop/tcr</a></pre>
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