Old 12-15-2015, 03:42 PM #1
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Default WTB Single Mode 200-300 mw 635nm or 450nm laser

I want to buy a single mode 200-300 mw 635nm or 450nm laser because
i want the very low divergence. I cant seem to find any for sale so im wondering if anyone would be willing to sell one to me or build one. Price wise im looking at $200 or less. less would be best


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Old 12-16-2015, 09:06 AM #2
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Default Re: WTB Single Mode 200-300 mw 635nm or 450nm laser

The problem with single mode is you can't get much power out of them for R,G or Blue (after normal lens losses) unless pushing them far beyond their ratings, blue giving the most at over 250mw, green maybe 120mw if pushed hard, I don't remember what I was able to get out of a red single mode but I don't think much over 175mw, I suppose I could have pushed the diode harder for more power but one member told me the output can depart from a normal single mode profile if pushed too hard. If you do go for red, I recommend 638nm as it is brighter to the human eye than 650nm.

Search ebay for single mode diodes and you will see some ratings, nothing actually rated at 200-300mw, most much lower. The low divergence of these single mode diodes is great for putting a dim spot on a high cloud base at night, but not very impressive compared to a multimode diode running a watt or more IF used with a beam expander. I recommend getting a higher power multimode laser diode and putting a 10X expander on it to make them have lower divergence. That way, you have a bright beam and low divergence at the same time, although a fat beam which makes it look dimmer due to being fatter, still far more brilliant than a single mode laser diode.

Edit: As usual, always an edit, why should this post be any different? One thing to watch out for if putting an expander on a multimode laser diode is that its input lens is big enough to accept the beam, some beam expanders have very small input apertures and multimode diodes normally have large diameter outputs. I've been buying some surplus Linos beam expanders, they have a nice wide input and can be adjusted from 2 to 8X, so if you don't want such a fat beam, you can turn it down.

Here's a Linos beam expander which can be used for red on ebay, this guy has been taking 100 dollars each if you offer it:

Linos Laserbeam Expander 2 8x 630 830nm | eBay This same seller has some beam expanders of the same kind which will work for green. You might think 100 dollars is a lot of money for one, but new they are over 1500 dollars each. Take this same beam expander and couple it with a single mode diode for even less divergence, then you would have uber low divergence, but since the beam would be fatter, less power density and even less impressive when viewed from the side.

For myself, for your first single mode, if you do go for that, I'd get a green single mode, due to the sensitivity of the eye being so much higher for green than red and blue, it's 10 times brighter at the same power level. A 50-100mw red single mode diode has a fairly dim beam when viewed from the side and blue is not much different.
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Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3

Last edited by Alaskan; 12-16-2015 at 09:40 AM.
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Old 12-16-2015, 09:16 AM #3
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Default

Quote:
Originally Posted by Alex2893 View Post
I want to buy a single mode 200-300 mw 635nm or 450nm laser because
i want the very low divergence. I cant seem to find any for sale so im wondering if anyone would be willing to sell one to me or build one. Price wise im looking at $200 or less. less would be best
Shoot me a PM Ive built a few 650s, 638s and 450s at these powers. If youre interested in a 405 at 110 mW (or 130 mW with a G lens) I have a couple built and up for sale.

Edit:

http://laserpointerforums.com/f39/2-...ves-93607.html

http://laserpointerforums.com/f39/up...ead-85693.html
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100mW 405 PHR
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2W 445 C6--link--
+2.3W 445 --link--
+2.5W 445 --link--

190mW 450 --link--
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25mW 532 --link--

520mW 638 --link--
1W 638

250mW 650
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Last edited by grainde; 12-16-2015 at 09:23 AM.
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Old 12-16-2015, 01:51 PM #4
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Default Re: WTB Single Mode 200-300 mw 635nm or 450nm laser

Quote:
Originally Posted by grainde View Post
Shoot me a PM Ive built a few 650s, 638s and 450s at these powers. If youre interested in a 405 at 110 mW (or 130 mW with a G lens) I have a couple built and up for sale.

Edit:

http://laserpointerforums.com/f39/2-...ves-93607.html

http://laserpointerforums.com/f39/up...ead-85693.html
PM sent
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1 O-like 650nm (200mw)
3 ebay 301-303 green lasers(50-90mw)
Custom Brass 495nm Laser build by Lifetime17(150+mw)
Sanwu 470nm silver series laser(3800mw)
Thor M2 445nm laser(1500mw)
405nm ebay 301 laser
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Old 12-16-2015, 07:37 PM #5
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Default Re: WTB Single Mode 200-300 mw 635nm or 450nm laser

Replied!
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Here is my old Kryton Groove FS thread!

100mW 405 PHR
700mW 405

2W 445 C6--link--
+2.3W 445 --link--
+2.5W 445 --link--

190mW 450 --link--
15mW 510nm
5mW 532 --link--
25mW 532 --link--

520mW 638 --link--
1W 638

250mW 650
250mW 780

3000 Lm C8 MTG2 @ 6 A!
Poppas mod 3A --link--
Sipik 98 Cu pill/star mod --link--
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