Other Parts Discussed in Thread: DLP6500FYE
Dear Sir/Madam,
I hope this message finds you well. I am reaching out to request your assistance with an issue I am experiencing related to the DMD module V-6501, purchased from Vialux.
Upon using the DMD chip (DLP6500FLQ, Type A DMD) under an fs laser source with a repetition rate of 1kHz, I noticed a distinct alteration in the DMD window. Specifically, the window appears less transparent, exhibiting a round shape that shifts and quivers every few seconds, resulting in flickering and significant distortion of the output light. Intriguingly, this effect is reversible; once the laser is off, the DMD window regains its transparency and flatness.
The problem seems to surface when the laser power is around 200mW or above, with the laser beam size approximately 1cm. Reducing the laser power alleviates the effect but does not completely eliminate it. Notably, this issue does not appear to be linked to the DMD pattern.
For context, we previously utilized other DMD 6500 modules (DLP6500, chip type of DLP6500FYE) from TI and did not encounter this issue, even at a laser power of up to 3W. I noticed from the technical data that the window thickness differs between the two modules (3mm for Type A DMD and 1mm for DLP6500FYE), and they utilize different types of glass (Corning 7056 for V-6501 and Corning Eagle XG for DLP6500FYE).
Despite studying the thermal evaluation data from TI, the temperature increase seems to remain under the threshold for my experimental condition.
Given the critical role this high-speed DMD module plays in our optical system, it is crucial for us to understand how to utilize it properly with the fs laser. I would greatly appreciate any insights, suggestions, or potential solutions you could provide. If necessary, I can furnish additional details for your reference.
Thank you so much for your attention to this matter. I eagerly anticipate your response.
