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Old 12-20-2010, 05:18 AM #17
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Default Re: Thinking of Buying the 500mW Laserglow 445 Polaris...Please advise

If the Polaris really had 0.9 mrad divergence with a 3-4 mm beam at its aperture, the dot would be ~37 mm at 120 feet.

The dot in the last picture is DEFINITELY larger than 37 mm.



Last edited by romogracie; 12-20-2010 at 06:06 AM.
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Old 12-20-2010, 05:37 AM #18
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Default Re: Thinking of Buying the 500mW Laserglow 445 Polaris...Please advise

Actually, in picture 2, at 40 feet the dot appears to be ~30mm, going by the cm scale on the picture on the left of the ruler.

In picture 3, at 120 feet, the dot on the fast axis appears to be ~55mm. (Which, yes, is a revision from 3 inches, but, look at it yourself; draw some lines in an editing program...)

That would give ~ 1.0 mrad, not anywhere near 2.0?

Really, doing divergence calculations off of a picture like this really isn't the best way to go.

It's hard to determine what is actually the dot size and what is camera sensor bloom or optical artifacts, and the perspective of the images makes it hard to get a very good measurement.
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Old 12-20-2010, 06:03 AM #19
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Default Re: Thinking of Buying the 500mW Laserglow 445 Polaris...Please advise

Yeah, the fast axis appears to be ~55 mm in picture 3.

The beam diameter is 3-4 mm at the aperture according to laserglow's site, so divergence is ~1.4 mrad according to the last pic.

Last edited by romogracie; 12-20-2010 at 06:07 AM.
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Old 12-20-2010, 12:09 PM #20
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Default Re: Thinking of Buying the 500mW Laserglow 445 Polaris...Please advise

aryntha, do you know, what is the power of this Polaris? Does the most powerful Polaris have just the same circle beam and so good divergence? And what Polaris did you buy (what power)?
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Old 12-20-2010, 08:53 PM #21
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Default Re: Thinking of Buying the 500mW Laserglow 445 Polaris...Please advise

Just so you know, these pictures were not produced to show divergence, just the ellipticity of the beam. I used my iPhone which, while it is a kick-ass phone, has a very hard time focusing on 447 nm laser beams. The apparent size of the dot in these pictures is not at all what it looked like in real life, and actually my laser tech and I were very impressed with the actual divergence of the laser over long range when measured properly. The average size of the laser spot ((fast axis+slow axis)/2) gives just under 1 mrad divergence when you measure with the naked eye.

Also, in addition to the fact that these pictures were taken hastily and with poor equipment, when measuring divergence you generally only count the portion of the beam which represents 80% of the total output power of the laser, so you don't just count the widest visible point. Due to the iPhone's poor focus and nonlinear gain ratio at this wavelength, trying to deduce the divergence from these pictures is futile and will lead to very inaccurate results. We stand by the divergence figures prepared by our technical staff and, as always, we guarantee all specifications to be accurate.

Please take these pictures as evidence that the laser has corrective optics which reduce the ellipticity of the beam (this was the original intent), but don't try to judge the actual divergence using these data as you will be incorrect.
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Old 12-21-2010, 01:23 AM #22
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Default Re: Thinking of Buying the 500mW Laserglow 445 Polaris...Please advise

looking forward to the review

What I like in laserglow is that they get an already very good CNI laser and tune it for an excelent product. If the aryntha review proves that the divergence is low and the dot is near round, this will be my next laser for sure. A 445nm with a good beam profile is super ***y.

Cheers!
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Old 12-21-2010, 04:01 AM #23
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Default Re: Thinking of Buying the 500mW Laserglow 445 Polaris...Please advise

Hey everyone - my review is here. (link).

Understand that this is "only" a Polaris-100, as it's what I could afford at the time (Also, these diodes perform 'cleaner' at lower powers, with less transverse modes, so, already having plenty of 'eyeball burner' 445s, I wanted to concentrate on beam quality.)

But overall, I think people will still be pleased with its performance. I know there will be people who will scoff at the power, but as I've said before - power isn't everything.

Note that this sort of beam profile, as Justin states, is available in the 50-400mW models.

Regina, since I know you're after beam visibility -- I think it'd be great for you to aim for a Polaris-400 and get the same kind of optics in really not half-bad power.

I hope this helps.
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3392nm:REO LHIP HeNe 2mW ∙ 980nm:OLIKE 155mW

808nm:OLIKE 200mW ∙ JETL PLC 600mW(682pk)
780nm:OLIKE 120mW
685nm:18650 47mW
671nm:PGL3M 281mW DPSS ∙ PGL3C 278mW
655nm:LOC 254mW ∙ OLIKE 221mW ∙ Yob 320mW
638nm:Sanyo 40mW ∙ HL63133 200mW ∙ PGL3C 463mWpk ∙ ML520 700mW
633nm:JDS1145 HeNe 28mW ∙ JDS1145 HeNe 26mW
612nm:MG 05LOR151 HeNe 3mW ∙ REO LSTP 3mW
609nm:REO LHOR 1mW
604nm:REO LSTP 2mW
594nm:Rigel 3mW ∙ LG PGL3C 15mWpk ∙ Lasos 7512 3mW ∙ CNI MGL3 58mWpk
589nm:CNI PGL3C 106mW ∙ CNI PGL3C 85mW
561nm:CNI PGL3C 30mW(41pk)
556nm:CNI PGL3C 20mW(22pk)
544nm:JDS1675P HeNe 2mW ∙ REO LHGR 2mW ∙ Lasos 7786 2mW
532nm:PGL3C 150mW(180pk) ∙ PGL3C 578mWpk ∙ PLC 440mWpk
515nm:JDS 221420GL ArI 30mW
510nm:52mW DG#2 ∙ 50mW 26650 DG
488nm:Nlx DPSS 7mW ∙ JDS 2214 ArI 40mW ∙ JDS FCD488 DPSS 25mW
ML:MG 65A106025 ArI ML 115mW
476/480nm:Nichia Diode 28mW
473nm:PGL3A 45mW(80pk) ∙ PGL3C 110mWpk ∙ PGL3C 95mWpk ∙ RPLB-25 60mWpk
465nm:DTR NDB7676 2.03w
458nm:JDS 2214VL ArI 8mW ∙ JDS 2214VL ArI 12mW ∙ RHD Diode 1.7W
452nm:Osram SM 47mW
445nm:Yob 1410mW ∙ Polaris 156mW ∙ PGL3C 1200mW ∙ DTR-EHG 32650 2136mW
405nm:Yob 630mW ∙ Qfox 750mW ∙ JETL PLC 780mW
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Old 12-21-2010, 04:57 AM #24
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Default Re: Thinking of Buying the 500mW Laserglow 445 Polaris...Please advise

Justin, since the 1W Polaris doesn't contain any corrective optics, what is its divergence?
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