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Thread: Just a pic

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    Default Just a pic

    For Stuka, A day at the office, redacted as needed. This is a OPO... For the wavelength collectors, this is 230 nm to 2.5 uM. in ~0.125 nm steps.

    Steve
    Attached Thumbnails Attached Thumbnails OPOSUM.jpg  

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    yummy range! which crystals and wavelengths are you using, if allowed to know?

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    Cool toys!!
    RR

    Metrologic HeNe 3.3mw Modulated laser, 2 Radio Shack motors, and a broken mirror.
    1979.
    Sweet.....

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    1064 doubled to 532, 532 mixed with residual 1064 for 355, 355 pumps the OPO.

    Steve
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    First pangolins, now opossums? Nice.
    No gaps in that range? Sounds like a laser equivalent of a good AOR RF receiver. But even at a grand the receiver is probably cheaper by far.

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    No gaps, with options to extend to Deep UV and Mid IR if needed.

    Steve
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    I won't ask if it can pop balloons, but I have to ask: is this something likely to scale into tunable show devices? Last I heard (read), there was another device, a fibre excited with sharp pulses, spreading them to form outputs that were said to allow some selections from a range of wavelengths, but I don't know what happened to that, or even if I understood it at all. I remember it was analogises with hitting a phone line between poles with a stick, and the selection of wavelenghs made by tuning resonances to favour them. A stretched wire while pitched, will produce very many frequencies if hit hard and fast, hence the analogy...

    This tunable OPO laser sounds like a much cleaner way though.

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    This laser runs at 25 Hz and is pulsed, with a ~5 nanosecond pulse duration. It strobes. It is flashlamp based, and such systems are STILL in high demand. This is one of many cases where a lamp is more economical then diode based systems. 300$ for a spare flashlamp can get you two years or more of operation. We do make diode pumped systems as well, but not for this niche.

    Steve
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    Not a show laser then. But that led to a more interesting thought... A Q-switch will shorten a pulse, raising peak power, for some loss, maybe analogisable with a hydraulic ram to pump water to greater height. But is there some way to do this the other way round? Can a quasi-CW laser exist based on a source of short hard pulses, being 'smoothed' to form a gently undulating beam that is almost as safe as CW would be for the same average power? I don't think I ever heard of anything like this, or even saw the question asked before..

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    Quote Originally Posted by The_Doctor View Post
    Not a show laser then. But that led to a more interesting thought... A Q-switch will shorten a pulse, raising peak power, for some loss, maybe analogisable with a hydraulic ram to pump water to greater height. But is there some way to do this the other way round? Can a quasi-CW laser exist based on a source of short hard pulses, being 'smoothed' to form a gently undulating beam that is almost as safe as CW would be for the same average power? I don't think I ever heard of anything like this, or even saw the question asked before..
    No, Not really.....
    Pulse stretching is limited in the nanosecond domain. You can split and recombine pulses after running them through delay lines at roughly 300 mm per nanosecond, but do this more then a few times and you have a very high loss system.

    Steve
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