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  1. R

    cheap Chinese ebay LPMs vs Coherent LaserCheck vs LaserBee

    I see that it might be easier to probe higher power lasers (more heat?). My application deals with lower powers (up to 200 mW), and is more about the stability and resolution (1-3%). I believe, all things equal, higher accuracy and sensitivity would be better to have than being able to deal...
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    cheap Chinese ebay LPMs vs Coherent LaserCheck vs LaserBee

    Many thanks, Adam! Exactly the type of unique DIY insight I love this forum for :) May I ask if you found any thermal issues with the unit? I suppose, they placed the sensor far away from the battery, so, probably, it's not too bad of an issue. If I had to build something similar, I would...
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    cheap Chinese ebay LPMs vs Coherent LaserCheck vs LaserBee

    The target is a microscope slide, with fluorescent molecules on it; the laser makes them glow; I image them with a camera. 730 nm is a somewhat exotic line. The power of available good-quality laser sources (e.g. Coherent) is limited at 30 mW at TEM00, and I get about 20 mW out of the fiber...
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    cheap Chinese ebay LPMs vs Coherent LaserCheck vs LaserBee

    Many thanks! This looks exactly like the box I saw on ebay :) I even started thinking to get a used body of a mirror-less camera; but realized that they may not even power up w/o the lens attached.
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    cheap Chinese ebay LPMs vs Coherent LaserCheck vs LaserBee

    This is what I was hoping for (that someone has bought this unit and could give feedback). I am now leaning towards getting a basic monochrome USB CMOS cam from Edmund (e.g. their 14-857, abt $300), put in NDF, and profile the beam that way. Quantum yield of the sensor is cited at 30% at 730 nm...
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    cheap Chinese ebay LPMs vs Coherent LaserCheck vs LaserBee

    Yes -- Thorlabs EE02 coating. Previous ones were protected silver (1/2 the price) I suppose I could rig a 1/2" CCD or CMOS sensor together (have a few lying around) and integrate the pixels to get relative measurements upstream/downstream of the mirrors. I could put in an NDF to avoid...
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    cheap Chinese ebay LPMs vs Coherent LaserCheck vs LaserBee

    I need to measure the power of a 730 nm TEM00 laser beam that reaches a target after bouncing off 10 consecutive mirrors. Previously the mirrors had a rating of 90% reflectivity; I have replaced them with ones that have a rating of 99%. I want to verify this, and, if not the case, identify...
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    cheap Chinese ebay LPMs vs Coherent LaserCheck vs LaserBee

    I have a team-shared Coherent Field Mate PM10 (which is great, but is not always available), and a personal LaserBee recommended here . The latter was $200 and worked for 488, 532 and 633 at 200 mW, but could not probe a 730nm beam at 16 mW. The 730 nm beam is what I am after now. The...
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    gel color filters for DIY safety glasses

    Well, why not pay $10 000 for pair of safety glasses then? :) Surely, one's eyesight must be worth that much.
  10. R

    gel color filters for DIY safety glasses

    I agree regarding high power lasers; the 532 unit I was referring to was 50 mW. I would be curious to do side-by-side comparisons with the Eagle glasses, in terms of power damage,, and also to find out the details of the manufacturing process for coloured acrylic sold by stage filter companies...
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    gel color filters for DIY safety glasses

    Hi all, the following is, obviously, a do-at-your-own-risk idea, but for DIYers like myself who are not willing to pay $100 for certified laser safety glasses, I found that one can find interesting options on the Lee Filters web site, and cut the film to shape of regular wrap-around clear...
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    Suggestions for a power meter?

    I believe I have checked the Ophir sensors before (when looking for a professional grade one), and they appeared within the same price range as the Cohernet ones. Since I already know my local Coherent reps, it was easier at the time to get everything from Coherent and get a discount on a bulk...
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    Suggestions for a power meter?

    Thanks! I just ordered their basic unit that has the 10-14s 90% response time, it should be sufficient to get me started. I wish I could go for the 3-4 sec response time one, but was not ready to spend $330 yet (plus shipping -- I am in the UK).
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    Suggestions for a power meter?

    Hi all, I've been using high-end power meters for many years (Coherent mostly, $1.5K+), but I believe now there must be considerable competition from our friends over in China. Any recommendations for a low-cost power meter for relative measurements that would last 2-3 years? The wavelengths I...
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    Driver for this 2W 735 nm diode?

    Paul -- OK. Then, I will start at 0.025 A, try both orientations, if no light either way, go up a notch, and try both orientations at each step.
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    Driver for this 2W 735 nm diode?

    Hi Paul -- yes, quite embarrassingly, I do not know which cable is which. That said... the heat sink its not very deep, so I can shine light inside and take the best guess. Then I will drive it at 0.6A (for which I would need to set my driver first, using the dummy load -- correct?), and try to...
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    Driver for this 2W 735 nm diode?

    Paul -- May I ask what I can do to test the orientation of the diode when plugging it in, w/o destroying it? I stupidly did not label the cables, they got twisted, and it's already sealed in my heat sink...
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    Driver for this 2W 735 nm diode?

    Thanks a lot for your answers, both, they are very helpful! I also spoke to OdicForce on the phone (I got the drivers from them), and they were very helpful in explaining how to approach this. As you suggested, they recommended putting together a dummy load, which is what I am going to do...
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    Driver for this 2W 735 nm diode?

    Hi all, I got myself a 9 mm can emitter at 735 nm... it's still a relatively exotic WL, I guess, as a search for 735 yielded 0 results! :) I could not get it as a module for cheap: a turnkey one from coherent etc would be several K. So I got just the can, and I would like to drive it with a...
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    continuous duty, diode vs DPSS from laserlands

    Hey, that is a great point regarding the non-linearity of the pump. Good to know. :thinking: I am a biologist by training, you see :) I hope they can answer the lifetime question, rather than ignoring my request and moving on to thousands waiting to get their cool laser pens :) But I usually...




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