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Old 11-05-2011, 04:15 PM #65
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Default Re: 470nm diode

Update?


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Old 11-05-2011, 04:32 PM #66
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Default Re: 470nm diode

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Originally Posted by Misanthrop View Post
Update?
Yes - I am also interested to know what the results were.
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Old 11-05-2011, 06:49 PM #67
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Default Re: 470nm diode

I expect it in 1 - 2 weeks. They're building the module, and I have requested some changes to the wire leads and the lens. Nothing to do now but wait.

Edit: It's in route now, I'll probably have it around the 15th
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Old 11-15-2011, 12:17 AM #68
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Default Re: 470nm diode

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Originally Posted by Ablaze View Post
I expect it in 1 - 2 weeks. They're building the module, and I have requested some changes to the wire leads and the lens. Nothing to do now but wait.

Edit: It's in route now, I'll probably have it around the 15th
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Old 11-15-2011, 01:19 AM #69
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Default Re: 470nm diode

I have classes all day tomorrow, but I'll post as much of a detailed review as I can manage on Wednesday. Then perhaps I can send it to you to get a more detailed review.

I'm looking forward to laying rest to the suspense, one way or another.
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Old 11-15-2011, 01:47 AM #70
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Default Re: 470nm diode

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Originally Posted by Ablaze View Post
I have classes all day tomorrow, but I'll post as much of a detailed review as I can manage on Wednesday. Then perhaps I can send it to you to get a more detailed review.

I'm looking forward to laying rest to the suspense, one way or another.
Hey,

If it actually turns out to be 470nm (or seems like it's somewhere close), I would be happy to give it a more thorough review. I have a spectrometer two days away from me en route. Should be here by Friday.

Cheers
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Old 11-15-2011, 07:56 AM #71
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Default Re: 470nm diode

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Hey,

If it actually turns out to be 470nm (or seems like it's somewhere close), I would be happy to give it a more thorough review. I have a spectrometer two days away from me en route. Should be here by Friday.

Cheers
Is the spectrometer from the ebay seller science-surplus?
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Old 11-15-2011, 11:40 AM #72
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Default Re: 470nm diode

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Is the spectrometer from the ebay seller science-surplus?
Yes, why do you ask?
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Old 11-15-2011, 12:32 PM #73
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Default Re: 470nm diode

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Yes, why do you ask?
Actually, do you mind linking us to it ?
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Old 11-15-2011, 01:24 PM #74
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Default Re: 470nm diode

I don't have the link on hand (on my mobile here), but it's easy to find on eBay. I think I just searched spectrometer.
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Old 11-15-2011, 02:06 PM #75
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Default Re: 470nm diode

rhd how do you plan to get it calibrated or have you coughed up the $$ for them to do it for you ?
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Old 11-15-2011, 02:30 PM #76
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Default Re: 470nm diode

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rhd how do you plan to get it calibrated or have you coughed up the $$ for them to do it for you ?
Heck no. A $300 premium would have put this squarely outside of my price-range.

I think that with DPSS known-wavelength lasers in the following wavelengths - 473, 532, 556, 589, 594 - I should be able to accomplish alignment just as well as with their fancy metal vapor flash lamp item.

They suggested needing 4 known wavelengths, and I have 5, so it should be doable. I'm questioning whether the math will be within my abilities. It won't if I have to do it manually, but I'm hoping the software figures out the coefficients for me.

I've got ND filters to shoot the 473 (70mW), 532 (150mW) and 589 (65mW) through so that their intensity is brought down to somewhere on par with the 594 and 556. Other than that though, it should be fairly straight-forward. Shine each beam onto a white paper, feed that reflected light into the spectrometer for calibration.
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Old 11-15-2011, 02:39 PM #77
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Default Re: 470nm diode

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Originally Posted by rhd View Post
Heck no. A $300 premium would have put this squarely outside of my price-range.

I think that with DPSS known-wavelength lasers in the following wavelengths - 473, 532, 556, 589, 594 - I should be able to accomplish alignment just as well as with their fancy metal vapor flash lamp item.

They suggested needing 4 known wavelengths, and I have 5, so it should be doable. I'm questioning whether the math will be within my abilities. It won't if I have to do it manually, but I'm hoping the software figures out the coefficients for me.

I've got ND filters to shoot the 473 (70mW), 532 (150mW) and 589 (65mW) through so that their intensity is brought down to somewhere on par with the 594 and 556. Other than that though, it should be fairly straight-forward. Shine each beam onto a white paper, feed that reflected light into the spectrometer for calibration.
lucky man

i bet that will work fine considering you have 5 dpss lasers that have stable WL where diode lasers can shift wavelength a bit....
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Old 11-15-2011, 03:00 PM #78
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Default Re: 470nm diode

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lucky man

i bet that will work fine considering you have 5 dpss lasers that have stable WL where diode lasers can shift wavelength a bit....
You could never get even a roughly decent calibration using diode lasers. You'd end up with a spectrometer many times less reliable than the diffraction grating approach.

"445"s would be completely out of the question, as they can range from 435 to 460.

As would "635"s, since even when not over-driven, they can very easily stray by 10nm or more.

"658"s are just as bad as 635s, even though their wavelength shifting gets less attention.

What's left? I suppose I don't know how stable 405s are, but I'd have to assume they vary a lot too, since they're the same bsic technology as 445s.

Long story short, you can't calibrate those machines using diode lasers as any part of the equation. DPSS should be doable.
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Old 11-15-2011, 03:10 PM #79
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Default Re: 470nm diode

I've only measured 6 "405nm" diodes, and so far they range from 403-418nm.
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Old 11-15-2011, 04:25 PM #80
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Default Re: 470nm diode

Gas lasers can have very narrow linewidths too, a simple HeNe would extend your stable wavelength range to 632.8. A mixed gas laser would get you even wider. A simple gas discharge lamp doesn't have to be that expensive, take a look here:
Gas-discharge lamp - Wikipedia, the free encyclopedia
Neon lamps are quite common and some nice visible lines. Xenon looks perfect with lots of lines and are common as car headlights. All the lines are documented somewhere, so that won't be the problem.

If you think the math is a problem just post your measurement results here, I'll do a curve fit for you.
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Big Sky Er:YAG - HP 8168D 1480-1570nm tunable laser source - Spectra Physics 3800 modelocked Nd:YAG - lots of IR diodes and bars - LPC-815 200mW 650nm - DL 6353TL 635nm 5mW - HP5501A stabilized HeNe - 2x Melles Griot 05-STP-910 stabilized HeNe - Spectra Physics 3500 Dye laser - REO 30536 543nm 2mW - Coherent DPY315-100 532nm 100mW SLM DPSS - Lexel 85 - 3x B&W tek 10mW 473nm - 445nm 3W Bluefan Sabre module - SF-AW210 150mW 405nm - DPSS inc 355nm 100mW Q-switched

Power meters:
Laser precision RkP-575 w/ RK-5710 - Ophir 10A-V2-SH - Ophir OEM 20C-A - HP 8152A w/ 2x 81521B - Coherent 212 - Anritsu ML93 w/ MA98A - 2x laser precision AM-400 - Leader LPM-8000

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