plexus
0
- Joined
- Dec 9, 2007
- Messages
- 441
- Points
- 28
I bought an Ultra Lasers 120mW laser pen. Its your typical looking laser pen but with a nice finish. Anyway, its my first 532nm DPSS pen, before that i've only owned NeNe's. After playing with the laser a bit I noticed some things and I wanted to get sense of this from you guys in order to determine if my laser is working properly.
When the laser is cold, at room temperature, and i turn it on, the beam seems to be in TEM01 mode (two lobes). I can see this when i put a spreader lens in front and cast on the wall. After about 60 seconds it gets more into a TEM00 mode. I find that i have to turn it on and off to get it to switch out of what appears to be TEM01. It will work in TEM00 mode for about 30-40 sec and then switch back into TEM01 mode. if i turn it on and off it start out in TEM00 and move to TEM01 in less then a second.
Is this typical of your average non TEC non temp regulated green pens?
i dont have any way to measure the output but i can tell you that when in this TEM01 ish mode it wont burn tape or the palm of my hand. but when its in TEM00 ish mode it will burn tape and the palm of my hand.
the test i have been using to determine if its operating ok is to shine it into the palm of my hand and observe both the brightness level of the reflection onto a table and the speed at which it burns.
i made a youtube video of this here [i cant post links for some reason so you will have to search for it, the title is Ultra Laser 120mW DPSS Green Laser Pointer Mode Change]
thanks!
When the laser is cold, at room temperature, and i turn it on, the beam seems to be in TEM01 mode (two lobes). I can see this when i put a spreader lens in front and cast on the wall. After about 60 seconds it gets more into a TEM00 mode. I find that i have to turn it on and off to get it to switch out of what appears to be TEM01. It will work in TEM00 mode for about 30-40 sec and then switch back into TEM01 mode. if i turn it on and off it start out in TEM00 and move to TEM01 in less then a second.
Is this typical of your average non TEC non temp regulated green pens?
i dont have any way to measure the output but i can tell you that when in this TEM01 ish mode it wont burn tape or the palm of my hand. but when its in TEM00 ish mode it will burn tape and the palm of my hand.
the test i have been using to determine if its operating ok is to shine it into the palm of my hand and observe both the brightness level of the reflection onto a table and the speed at which it burns.
i made a youtube video of this here [i cant post links for some reason so you will have to search for it, the title is Ultra Laser 120mW DPSS Green Laser Pointer Mode Change]
thanks!