Natural Science Forum / Physics / Optics / December 2004

Can anyone point me in the right direction to buy one of these?
Laser has 3 diode laser arrays rated at 35W each, pigtailed into a
single SMA connector.  The fiber bundle is about 2 mm with a 3.15mm
jacket.

I'm just interested in microscopy as a bit of a past time and am fascinated
by the house dust mite.  Please, what is an easy way to secure and prepare
to view these minute pests?
So far I have been using sellotape but it's a bit ackward to say the least!

I recently acquired a tank of HeNe gas as well as some tanks of Argon gas.
Can anyone tell me how to fill these tubes and where I might find a list of
the required pressure for various tubes?
Thanks, and Happy Holiday Season to all

I have put my new Viasho laser on a photodiode and discovered that it is
very noisy.  No wonder that was not a specification.
Despite that, the thing does perform modulation at acceptably fast
speeds, with about a 10us turn-on delay and 8us turn-off delay.

Would a KTP crystal like this be capable of generating several watts of
green?  I know these crystals are generally expensive but don't know if
there would be a difference between a crystal capable of producing 100mW vs.
one for 10W, or 30W.  I'm pretty sure all crystals are NOT ...

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If I buy a laser from Beijing Viasho directly, what happens or what must
I do regarding customs/duty fees?  Is it included in the purchase price
or do I have to pay after it arrives?
Thanks.

Stepping motor feel in galvo will usually indicate worn ball bearings.
Unless You're expecting top-quality response, it should work OK for
simple applications. Typical feel for this galvo is free movement. No
spring action. Same as optically-feedbacked Cambridges. Not sure about

I have a Synrad ~25W water cooled CO2 Laser, model D48-2-1155W.
Although the D48 series is still supported on Synrad's website, my
laser appears to be non-standard.  The only interface it has is via a
small headphone-like jack on the end.

I've an Spectra 171 argon with overpressure. I've accidentily used the
gas fill buton and now fun is over :-(. Could I try the cryo method
(I'm not sure that the glas reservoir will survive that procedure), or
is a refill the only option. It's a nearly new Tube, so I really don't

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=92078&item=3861627350&rd=1
Quantronix 324 SHG
Thanks,
Bob

I'm not a specialist in optical so I need someone to help me. I have video
camera with a 1/2" ccd size. I want to use it to take picture of a small
surface. I need to use a ring between the lens and the camera to zoom
correctly. I need a minimum 30 mm objectif. I found one ,a 50mm, ...

I have a handheld, battery powered DPSS laser that runs on two "C"
batteries.  This is the GLP-III model made by Changchun New Industries.
I've seen the guts of this laser, and I know that the pump is a 1W
C-mount diode.  This laser has a power output of 145mW from two C

I have some questions about the lens contain of doublet:
1.Is the doublet used in the lens always for the purpose of achromatic
design?
2.I had read from the books about the doublet which say "we use crown

I recently acquired an inverted Nikon microscope.
It is an older one similar to this one....
http://www.shattuck.com/swbscop1.jpg
What is this model and when was this model manufactured?