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Old 06-07-2009, 10:24 PM #17
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Mirror coatings are used to select wavelength. Tube length is a factor in the sense that the non-red wavelengths have very low gain and since mirrors are not perfect there is always some loss, and the longer tube is needed to increase the gain to compensate for those losses.

The HR mirror is usually broadband and will reflect all wavelengths equally while the OC mirror transmits all but the one needed. A cool experiment is to take a non-red HeNe and align a red-coated mirror with the laser cavity. You'll need a very very stable alignment jig but you can make a the HeNe hop between lasing colors!


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Old 06-08-2009, 04:37 AM #18
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What are the colors and powers of these lasers?

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Old 06-09-2009, 04:50 AM #19
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Quote:
Originally Posted by rocketparrotlet View Post
What are the colors and powers of these lasers?

-Mark
I would guess that they're all the standard HeNe red at 633nm. And judging on the tube size, I would say they are between 2-5mW depending on if they're single mode or multimode, and if they're polarized or not.
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Old 06-10-2009, 02:13 PM #20
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Originally Posted by Morgan View Post
Man! If you could combine all those into one beam you'd get around 20mW!!!!!!!

It'd be nice to go outside when it's raining though and catch a few on your tongue. No wait.... That'd be stoopid. You might get one in the eye. No, wait again... THAT'S what laser goggles are for!!!

M
looool xD It's more simply to buy normal laser diode 0,5-1W 635nm from Chris on ebay, it won't be so expensive.
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Old 06-10-2009, 11:17 PM #21
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looool xD It's more simply to buy normal laser diode 0,5-1W 635nm from Chris on ebay, it won't be so expensive.
Good luck getting a beam that is as nice as a HeNe beam though

I have a HeNe here that does almost 25mW
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Old 06-11-2009, 09:24 PM #22
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Quote:
Originally Posted by mauswiesel View Post
i made a spectrograph of a 546.8 HeNe laser showing the fluorescence in the cavity :

i don't remenber how to choose a particular wavelenght, is this with the lenght of the cavity ?

Where did you get the groovy software ?
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