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The report that I got from the student was initially an intermittent electrical turn on that progressed to no electrical turn on at all. </div>
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-Michael.</div>
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<b>From:</b> Prashant Srinivasan <prashant@ucsb.edu><br>
<b>Sent:</b> Wednesday, December 3, 2025 10:08 AM<br>
<b>To:</b> Johnson, Michael W <mjohnso6@tulane.edu>; labnetwork@mtl.mit.edu <labnetwork@mtl.mit.edu><br>
<b>Subject:</b> Re: [labnetwork] Fianium WhiteLase SC-400-4 supercontinuum fiber laser…4 W</div>
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<p style="margin-top: 0px; margin-bottom: 0px;">External Sender. Be aware of links, attachments and requests.</p>
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<p style="margin-top: 0px; margin-bottom: 0px;">Hi Michael,</p>
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<p style="margin-top: 0px; margin-bottom: 0px;"> Do you mean intermittent electronic turn-on, or intermittent optical power? A SCL is a multi-stage system. Typically looks like this:</p>
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<p style="margin-top: 0px; margin-bottom: 0px;">Seed laser (say 1550 nm) -->Pre-Amp-->Bandpass filter-->High power Isolator-->Double clad power Amp-->Nonlinear fiber for SC generation</p>
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<p style="margin-top: 0px; margin-bottom: 0px;">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>
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<div>On 12/3/2025 7:45 AM, Johnson, Michael W wrote:</div>
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It worked fine optically until the problem started.</div>
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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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I will likely open it up in the next week to investigate. </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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This problem just fell in my lap yesterday.</div>
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-Michael.</div>
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<b>From:</b> Prashant Srinivasan <a id="OWA6df98634-4a3f-d6c2-4f02-c123e9c294e8" class="x_moz-txt-link-rfc2396E OWAAutoLink" 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 id="OWAa3174d92-9852-9e0d-5153-3728792d9d3a" class="x_moz-txt-link-abbreviated OWAAutoLink" href="mailto:labnetwork@mtl.mit.edu">
labnetwork@mtl.mit.edu</a> <a id="OWA89c7ac37-ead4-d3a4-7405-ad47f2176bac" class="x_moz-txt-link-rfc2396E OWAAutoLink" href="mailto:labnetwork@mtl.mit.edu">
<labnetwork@mtl.mit.edu></a>; Johnson, Michael W <a id="OWAbc51ccc3-f586-05be-c660-fee4e6fcd692" class="x_moz-txt-link-rfc2396E OWAAutoLink" 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</div>
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<p style="margin-top: 0px; margin-bottom: 0px;">External Sender. Be aware of links, attachments and requests.</p>
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<p style="margin-top: 0px; margin-bottom: 0px;">What is wrong with it? What are the symptoms? Issue with the driver (electronics), burnt fiber, dead pump diode?</p>
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<div>On 12/2/2025 3:41 PM, Johnson, Michael W wrote:</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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The manufacturer has done an end of life on it and will no longer support it. Obsolete.</div>
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Sometimes these companies have ex employees that open a shop to service older gear.</div>
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Can't get schematics from the company.</div>
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Any leads would be appreciated.</div>
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-Michael.</div>
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Tulane University </div>
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TINI</div>
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<pre><div>--
Prashant Srinivasan,
Teaching Cleanroom Manager
Department of Electrical and Computer Engineering
University of California Santa Barbara
Santa Barbara, CA 93106
<a id="OWA18f32813-460f-2879-6b45-669116f25909" data-auth="NotApplicable" originalsrc="https://www.ece.ucsb.edu/department-resources/electronics-shop/tcr" class="x_x_moz-txt-link-freetext x_moz-txt-link-freetext OWAAutoLink" href="https://www.ece.ucsb.edu/department-resources/electronics-shop/tcr">https://www.ece.ucsb.edu/department-resources/electronics-shop/tcr</a></div></pre>
</blockquote>
<pre><div>--
Prashant Srinivasan,
Teaching Cleanroom Manager
Department of Electrical and Computer Engineering
University of California Santa Barbara
Santa Barbara, CA 93106
<a id="OWA1f3cdac6-ae78-6970-6493-6588caee4744" data-auth="NotApplicable" originalsrc="https://www.ece.ucsb.edu/department-resources/electronics-shop/tcr" class="x_moz-txt-link-freetext OWAAutoLink" href="https://www.ece.ucsb.edu/department-resources/electronics-shop/tcr">https://www.ece.ucsb.edu/department-resources/electronics-shop/tcr</a></div></pre>
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