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WTB: Ophir Heads, Ophir LPMs

paul1598419

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You know a good spectrometer can give you real time relative power instantly. That is what I use when trying to determine if a DPSS laser is jumping around.
 



lasersbee

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He repossesses them into underspec, and very pricey non-negotiable Ophir LaserBees from what I can gather. He is not willing to do any deal of the sort...from what I can gather. That route is dead.

Thank you Lifetime but I am well aware of LaserBee at this point. The thermopile is too slow for me.
Would you like to clarify this obviously false statement ????
You seem to be whining about the fact that you want a high
quality high priced OPHIR Head LPM for ~$20...

Yeah.. and I'm looking for a Lamboughini 5000s for $2000.
Time to wake up and smell the coffee Snecho...

,you're getting 4 data points in 60 seconds. Simply not useful for creating LPM graphs imo. Even the 100% response time of 10-12 seconds on the LaserBee II is too slow, the Ophir does a 95% response time in 0.8 seconds
Are you comparing a Professional Commercial OPHIR Head to
a Hobbyist LPM ???
BTW our Graphing software does not take a reading every 15
seconds as you suggested. It records a reading every second.

Our LaserBee II has a 90% response time of 3-4 seconds...

Our Newport 1825C we use in the shop daily has a true response
time of ~5-6 Seconds. Our over $2500 Coherent Fieldmax II
has a true response time of ~2-3 seconds.

We tested many OPHIR 20C heads and the true response time
is closer to ~2-3 seconds.

I do agree that for unstable DPSS type Lasers a fast response
time is crucial.


Jerry
 
Last edited:

Lifetime17

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Would you like to clarify this obviously false statement ????
You seem to be whining about the fact that you want a high
quality high priced OPHIR Head LPM for ~$20...

Yeah.. and I'm looking for a Lamboughini 5000s for $2000.
Time to wake up and smell the coffee Snecho...



Are you comparing a Professional Commercial OPHIR Head to
a Hobbyist LPM ???
BTW our Graphing software does not take a reading every 15
seconds as you suggested. It records a reading every second.

Our LaserBee II has a 90% response time of 3-4 seconds...

Our Newport 1825C we use in the shop daily has a true response
time of ~5-6 Seconds. Our over $2500 Coherent Fieldmax II
has a true response time of ~2-3 seconds.

We tested many OPHIR 20C heads and the true response time
is closer to ~2-3 seconds.

I do agree that for unstable DPSS type Lasers a fast response
time is crucial.


Jerry
Hi Jerry
I was wondering when you were going to intervene and set the record straight.
Thank You Rich:)
 

lasersbee

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Messages
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Points
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I actually only saw this yesterday...
How's it going Rich ? Hope all is good. ;)

Jerry
 

hwang21

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While I won't speak for Snecho's statements, my statements were not intended to be offensive to LaserBee or Jerry. I was merely pointing out reasons why Snecho would desire an Ophir head over a LaserBee thermopile... which, as Jerry mentioned, is a commercial grade product. It should be pretty obvious why Snecho would prefer an Ophir head :p

@jerry, I wasn't saying that your software response is slow. I was intending that if a thermopile cannot attain an accurate response within a reasonable time, then the resulting graph does not really represent the performance of the laser. Even if the datalogging software polled the thermopile's data every millisecond, if it takes the thermopile 15 seconds to reach the true output power, then those milliseconds don't really matter all that much, as the graph that you see is a rolling average of the laser's output power with a time-averaged window 15 seconds long

So then the question becomes, what is a "reasonable time" for a thermopile to reach the true output power? IMO, anything over around a second is too long, especially if you're trying to do something resembling closed-loop feedback - for example, adjusting a drivers' potentiometer on the fly. But, that spec is expensive to attain, and everyone has their own priorities in their purchases, so to each their own 🍻 personally, I think the response time of the LaserBee II is probably good enough, but I already have an Ophir-based LaserBee 😉 I just would not recommend the LaserBee A10/AX/AX3/3.7W USB ones that take 30-40 seconds to reach 100% response
 




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