# C02 laser gets weaker above 50%

**URL:** <https://forum.cloudray.com/t/c02-laser-gets-weaker-above-50/663>\
**Category:** Laser Power Supply\
**Created:** [December 30, 2021, 3:19am UTC](https://forum.cloudray.com/t/c02-laser-gets-weaker-above-50/663 "2021-12-30T03:19:45Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![soahnk](https://avatars.discourse-cdn.com/v4/letter/s/67e7ee/32.png) [@soahnk](https://forum.cloudray.com/u/soahnk)\
**Post date:** [December 30, 2021, 3:19am UTC](https://forum.cloudray.com/t/c02-laser-gets-weaker-above-50/663/1 "2021-12-30T03:19:45Z")

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My 40-50W co2 laser cuts 1/4" plywood and acrylic well at 50% but above 50%, the cuts get shallower as I increase the power. The current stays approximately proportional to the power setting, but the beam seems to get weeker. Is this normal or a sign of a partucular failure?

The tube has less than 100 cutting hours, mostly at about 45%. I almost never run above 15mA current.

The tube is a TONGLI 40-50W Co2 Laser Tube  
35-50W CO2 MYJG Serise Power Supply MYJG-40 OG 110/220V × 1

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**Author:** ![Goodman](https://avatars.discourse-cdn.com/v4/letter/g/838e76/32.png) [@Goodman](https://forum.cloudray.com/u/Goodman)\
**Post date:** [December 30, 2021, 5:50am UTC](https://forum.cloudray.com/t/c02-laser-gets-weaker-above-50/663/2 "2021-12-30T05:50:48Z")

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According to your description, you are not sure whether it is caused by the laser tube or the power supply. It needs to be investigated. Do you have other power sources now?

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**Author:** ![soahnk](https://avatars.discourse-cdn.com/v4/letter/s/67e7ee/32.png) [@soahnk](https://forum.cloudray.com/u/soahnk)\
**Post date:** [December 31, 2021, 6:46am UTC](https://forum.cloudray.com/t/c02-laser-gets-weaker-above-50/663/3 "2021-12-31T06:46:19Z")

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I do not have another power supply.

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**Author:** ![mtemmink](https://avatars.discourse-cdn.com/v4/letter/m/85f322/32.png) [@mtemmink](https://forum.cloudray.com/u/mtemmink)\
**Post date:** [February 26, 2023, 11:07am UTC](https://forum.cloudray.com/t/c02-laser-gets-weaker-above-50/663/4 "2023-02-26T11:07:02Z")

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Check if your laser mirror alignment is spot-on. It could be that when you increase the power, that the beam gets reflected within the side of the laser head tube and is not 100% leaving your laser head. If you increase the power, thus the tube (at the laser head) getting warm/hot?