Giannis_TDM
Well-known member
- Joined
- Apr 27, 2019
- Messages
- 911
- Points
- 93
Random pic that i took bout 20 min ago 100-120mw 303 with an about 1w m140 build
![ibb.co](https://i.ibb.co/YRRSkzJ/image.png)
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Yea it kinda helps that the efficiency of the crystals is known but yea cant argue with that an LPM will be the best way to measure it. Sadly I don't own one and the shipping cost to send it to a member for lpming would be too much. If I recall correctly the efficiency of the Nd:YaG is 62% and the KTP 48%*the diode should be a common 500mw one with 2.2vin x0.422(measured it exactly with a better non eBay) meter = about 928mw of power going into the diodeUnfortunately, the input current to the 808nm pump diode's driver won't translate at all to the optical power of the SHG 532nm green laser light. There are far too many variables that will effect that to a much greater extent. While seeing a greater brightness of lasers of the same wavelength can be indicative of greater output power, it is much more difficult to quantify that effect. If you had been matching many lasers at the same wavelength knowing the output power you might get to a point where you can predict the power to maybe +/- 30% at best just using visual cues, but in the end an LPM measurement is the gold standard for stating output power.
Eh a least I tried. Know any decent cheap Lpms to recommend?Wow. Where to start? I have measured the output of many 532nm lasers using 500 mW 808nm pump diodes and they never get above 100 mW even with the unfiltered IR component. The setups you referenced aren't the same as these very cheap units with the two crystals bonded together and set on a brass heat sink which is too often glued in place over the pump diode. I also have had my share of ones with 1 watt pump diodes and those don't do more than 200 mW with the unfiltered IR. You run into too many problems when trying to figure out the output power by assuming these efficiencies are all that hold sway on the output. Temperature is very important for your crystal sets and that is not factored into any of your equations. Temperature also has an effect on the pump diode. Also, the polarization of the pump diode will have an effect over the output power. Really, there is no way forward but to measure the output.
Ok a little pricey but I understand I pay for quality So *dear Santa I want a laser bee Ax meter thanks!*
Ok a little pricey but I understand I pay for quality So *dear Santa I want a laser bee Ax meter thanks!*