It appears you have yet to understand stability Issues with 473nm laser in Handheld.
That Chart you Showed Is NORMAL.
In fact Not Bad.
Here is a LPM video Of My New 473nm laser That I bought Directly from CNI:
The video was started about 30 seconds late to try to save time when i shot it for a Friend to watch.
I do Have Full RUn tests too But dint upload them yet.
Watch the Whole video though. At the end when it starts to Drop If I let it continue to drop it will keep dropping all the way down to Probably 10mW. THIS IS NEVER GOOD TO DO.
I have never let it drop bellow 80mW on the Drop off. Normal i dont let it get less then 100mW. I know my Duty Cycle to not allow it to drop off bellow that its <2 minutes. After I use the laser I will not touch or run this laser again for at least 1 hour at the very least. More like a couple hours.
This is due to the crystal getting Warm/Hot. 473nm is extremely Temp sensitive as people mention.
You must get familiar with your laser. This is totally different then "Diode Laser" and even your 589nm laser. 589nm is more stable then 473nm.
Always only run the laser from a Cold Start. NEVER when its still warm within a previous Use/Run. You will burn out your Crystal and make it even more Inefficient and then it will be truly dead.
I did some work on a 473nm laser that died that i ended up fixing on my own again to a working condition and this has made me understand how Temp sensitive these 473nm really are.
The Only thing i can say is Let it cool down Completely before you run it again. You will never get the same peak as the first time on the second and third run. Fallow a Less then 2 minute duty cycle or never let it drop below 80mW.
If your Laser is Getting Warm you are running it to long.! I mean if you feel any warm coming off the laser you are running it to long.
Is This a True CNI Laser or is this From Laser*ever. Have you Confirmed this. Iam not doughing the OP is telling the truth or not just wondering. The way you can tell i figured out if its a CNI laser but is not 100% all the time right is IF the Laser came in a Anti static bag with the Model write on the bag. The second way you can tell is you will see a serial code sticker down by where you insert the battery. If the laser does not have these 2 things most likely not 100% of the time but most likely it is not from CNI. I Just got a CNI 80 The one in the video and it had this. I asked 2 people to check this on there Laser*ver version and it dint have this. This has nothing to do with your problem but figured i would say it as Iam sure it crossed your mind.
I Just find it Extremely Low Priced to be one that was Bought from CNI as i can tell you that is less then Half the Price for a New One directly from them and that price is 50$ more then a new one directly from Laser*ever costs.
Just Curious and my .02 cents.:undecided: