Old 08-14-2010, 04:59 AM #1
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Question what is the difference between beam modes TEM00, TEM01, TEM02

i hear all this talk about the different beam modes (TEM00, TEM01, TEM02) but what do they mean


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Old 08-14-2010, 09:06 AM #2
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Default Re: what is the difference between beam modes TEM00, TEM01, TEM02

Im sure someone will explain in more detail, but heres a picture



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Old 08-14-2010, 09:46 AM #3
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Default Re: what is the difference between beam modes TEM00, TEM01, TEM02

Allways wonderd that but was too lazy to search.

Hey at least i'm honest!

Nice info.
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Old 08-14-2010, 11:43 AM #4
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Default Re: what is the difference between beam modes TEM00, TEM01, TEM02

A good beam, A crappy beam, & a crappier beam, LOL

BlackSpirit has it right
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Old 08-14-2010, 06:47 PM #5
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Default Re: what is the difference between beam modes TEM00, TEM01, TEM02

Quote:
Originally Posted by phoenix77 View Post
A good beam, A crappy beam, & a crappier beam, LOL

BlackSpirit has it right

the lower the TEM the better the beam? how does one measure it?

Last edited by ipod; 08-14-2010 at 06:49 PM. Reason: measuring TEM
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Old 08-14-2010, 07:00 PM #6
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Default Re: what is the difference between beam modes TEM00, TEM01, TEM02

You measure it by expanding the beam and seeing what you have.

In most lasers though, higher modes mean more power. DPSS lasers would be the only case where sometimes this isn't true. It really depends on the cavity design. For most handhelds, usually the TEM mode doesn't matter since all your doing is pointing them at stuff.

When lasers are used for 'real science' as I call it. Holography, particle counting, etc, is when a stable Gaussian TEM00 beam is required.
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Old 05-16-2016, 10:24 PM #7
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Default Re: what is the difference between beam modes TEM00, TEM01, TEM02

Thanks for the info back spirit +rep
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Old 05-16-2016, 10:38 PM #8
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Default Re: what is the difference between beam modes TEM00, TEM01, TEM02

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Originally Posted by ThePhotonist View Post
Thanks for the info back spirit +rep

This thread is nearly 6 years old - it was last posted to in 2010. You should avoid bringing back such old threads unless you have something new to add. Just a heads up.
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Old 05-16-2016, 11:29 PM #9
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Default Re: what is the difference between beam modes TEM00, TEM01, TEM02

For He-Ne lasers, TEM01 is called donut-moding as the beam looks like a donut hole. it looks like a light beam with a dark spot in the middle. This is caused by destructive interference in the middle of the beam. It is especially bad when trying to make holograms.
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