XPost: sci.physics, sci.military.naval
From: fjmccall@gmail.com
Serg io wrote:
>On 5/18/2017 10:40 AM, Fred J. McCall wrote:
>> Serg io wrote:
>>
>>> On 5/18/2017 9:19 AM, Robert Clark wrote:
>>>> "Fred J. McCall" wrote in message
>>>> news:pe8rhc5io10st9eouc05gs6sqkbj1m8j43@4ax.com...
>>>> ==================================================
>>>>>
>>>>> The U.S. Navy is testing ...
>>>>>
>>>> That's "has tested", not "is testing".
>
>>>>> ... a 30 kilowatt laser ...
>>>>>
>>>> Like I said, A laser at power levels too low to be deployed.
>>>>>
>>>>> ... on the USS Ponce that can take out small boats and small drones.
>>>>>
>>>> Very small boats and drones.
>>>>>
>>>>> The plan is to install a more powerful 150
>>>>> kW laser that can take out larger ships and aircraft:
>
>>>> That's at least three years out. And any ship that gets one will need
>>>> at least half a megawatt of spare electrical capacity. That's quite a
>>>> stretch, given that big ships like the ARLEIGH BURKE class only have
>>>> 7.5 MW total and there is already concern whether they can power
>>>> potential radar upgrades.
>>>>
>>>
>>> the key problem is that large power lasers heat up the airpath and
>>> defocus themselves.
>>>
>>> 10kw or more.
>
>>
>> That's already pretty much solved with the 30 kW testing on USS PONCE
>> and for the 125 kW lasers that are being developed.
>>
>
>any idea how they solved it ? Pulsed can work, but that is low duty
>cycle...
>
I suspect some fancy stuff is being done with adaptive lenses coupled
with guide beams and phase conjugate lasers. The system is made up of
75 kW modules (up to four of them, from what I read), so they're
keeping the power in the beam lower by using multiple beams, too.
--
"The reasonable man adapts himself to the world; the unreasonable
man persists in trying to adapt the world to himself. Therefore,
all progress depends on the unreasonable man."
--George Bernard Shaw
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