[time-nuts] where can I purchase 794.7 nm VCSEL for building CPT rubidium clock?
scmcgrath at gmail.com
Mon Jun 11 12:55:56 EDT 2018
For experimental use you are probably better advised to use a dye laser or a Fabry-Perot laser as both are available on the surplus market and both are ‘tunable’ and leave the VCSEL till you have a functioning prototype
On Jun 11, 2018, at 4:29 AM, Dana Whitlow <k8yumdoober at gmail.com> wrote:
I should have written more clearly- the adhesive in question was *not* in
the optical path.
As is usual, variations are possible, one supposedly being that the crystal
at 1064 nm is also doped with something to make it nonlinear (so I've
read). I kind of
have my doubts over this, however it seems like asking too much of a single
substance to do "double" duty without some unwanted compromises.
On Mon, Jun 11, 2018 at 6:06 AM, Bruce Griffiths <bruce.griffiths at xtra.co.nz
> The better ones use optically contacted crystals to avoid browning of the
> adhesive due to the high power densities of the 1064nm laser required for
> efficient frequency doubling.
>> On 11 June 2018 at 22:52 Dana Whitlow <k8yumdoober at gmail.com> wrote:
>> Mark's description about how (most) green laser pointers work The better
> is a bit in
>> error, and is perhaps
>> over-simplified- the reality is actually more fascinating yet:
>> First a diode laser operating at around 808 or 809 nm is used to
>> pump a solid
>> state laser which generates light at 1064 nm. This light is then
>> doubled with an
>> intra-cavity nonlinear element to produce the final output at 532 nm.
>> For all this to work
>> the optical elements must be critically aligned, and to me the most
>> thing about
>> the low selling price is how this alignment is effected so cheaply. One
>> these units I've
>> opened up has the doubler crystal held down by a lump of cement on one
>> side- it looks
>> for all the world like it must have pushed into alignment and "held"
>> while the cement
>> was cured. Green pointers made in this way are characterized by quite
>> beam quality
>> and very little wavelength spread from unit to unit. However, they are
>> generally quite
>> delicate and ruined by mechanical shock.
>> Although not commonly known, at least one outfit (Z-Bolt) is now selling
>> "direct diode"
>> green pointers, where there is just one laser which emits directly in the
>> green, at around
>> 515-530 nm. These are much more robust, operate well over a wider
>> temperature range,
>> but have the usual poor beam quality (non-circular beam with some
>> characteristic of diode lasers made with simple collimating optics. And,
>> the output
>> wavelength spread from unit to unit is quite large.
>>> On Mon, Jun 11, 2018 at 2:43 AM, Mark Sims <holrum at hotmail.com> wrote:
>>> Well, no. Green laser pointers convert a rather high power 800 nm
>>> to 1600 nm in one crystal then divide it to 533 nm in another one.
>>> physics and manufacturing of them is best described as black magic.
>>> are cheap because China developed the process to grow the crystals in
>>> and crank out zillions of them for consumer products.
>>> I suspect that a 1600-ish nm to 800-ish nm converter is not a stock
>>> consumer-quantity device and will cost a pretty penny or two... like a
>>> red/IR laser diode can be had for 50 cents and a telecom VCSEL diode
> can be
>>>> It cannot be too much, given the fact that these are used in
>>> green laser pointers.
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