Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers



CLOSED: Osram PL 530 Modules: 808 nm to 530 nm OPSL Technology - Narrow .3 nm Linewidth (new, old stock)

Alaskan

Well-known member
LPF Site Supporter
Joined
Jan 29, 2014
Messages
11,055
Points
113
Not Holokid, surplus seller in Seattle. He sold these because they had fallen out of their trays, but some are marked NG, I assume No Good. He sent enough extras to cover some which might be bad, so I think he knew some may in fact be rejects and not just out of their trays.
 

Anthony P

Active member
LPF Site Supporter
Joined
Oct 7, 2018
Messages
215
Points
43
Holokid... really? I wasn't going to say anything yet, but the door has been opened.
A couple weeks ago, I ordered one of his RGB engines. It did not ship until the day it was due to arrive. The data sheets pictured in the ad were not included. When I e-mailed him about them he basically told me to look them up myself. I have not had time to power it up yet. I will do a product review when I do.
 

paul1598419

Well-known member
Joined
Sep 20, 2013
Messages
15,137
Points
113
Chris, I'd still like to get two of these that are definitely working. I don't know if you can test them before shipping, though.
 

RedCowboy

Well-known member
LPF Site Supporter
Joined
Jul 10, 2015
Messages
7,770
Points
113
I had reserved 4 but I don't need them, was only for kicks so I will sit this one out so others have a better chance...............unless you want me to take them or want me to pay which I will gladly do.
 

Immo1282

Well-known member
LPF Site Supporter
Joined
Sep 4, 2018
Messages
561
Points
63
I'm the same as Red here - Stick me at the bottom priority as I've no use for these yet, just wanted to get a few in to play around with :) Happy to chip in my amount to help cover your losses though I expect you've probably contacted the seller anyway!
 

Alaskan

Well-known member
LPF Site Supporter
Joined
Jan 29, 2014
Messages
11,055
Points
113
Guys, I am just going to send these to all of you and if they work, you can send the money later. Sorry for the delay, my wife has been taking all of my time, but she goes back to our other apartment in Ukraine soon and I will have time to take care of this.
 

Dragonsired1

New member
Joined
May 15, 2019
Messages
1
Points
1
Who is in for a group buy of PL530 low power ~50 mw green output laser modules? The more people we can get, the lower the price I can offer. I've been paying $10 dollars each in the past, I can get that price down to 7.50, or less, depending upon how many I order. Once we get enough people, I will need to collect the money via PayPal before I commit. These will be at my cost, buyer will need to pay shipping.

OPSL Technology info:
Low noise for holography: Unlike multi-longitudinal-mode Nd-based lasers, OPSLs do not exhibit green noise and deliver better noise performance than diode-pumped solid-state (DPSS) lasers, but without the need for line-narrowing optics, stabilization loops, and precise control over cavity temperature. The fundamental difference in behavior results from the short excited-state lifetime of the OPSL gain medium. With no stored gain, dynamic fluctuations found in DPSS lasers are completely absent in an OPSL and the longitudinal mode-pattern is thus entirely determined by the characteristics of the laser cavity. With this completely static mode pattern, there are no fluctuations in the overall doubling efficiency, and therefore no "green noise."






The above photo shows how quickly the beam expands due to the 4 to 8 mRad divergence. Inside, I do not see any collimation optics in the unit at all, the OC lens appears to be flat. Perhaps it has some amount, but if so, very little.



These units are not tightly collimated, if at all, and have a divergence somewhere between 4 to 8 mRad, per the manufacture specifications. Reports are they easily produce 75 mw output if actively cooled, I assume that means with a TEC. I've seen another report they can do up to 120 milliwatts output when cooled with a TEC but cannot guarantee this as I have not tried myself.

Due to their narrow linewidth of about .3 nm and low noise, these are ideal for holography work and if expanded to 20 mm diameter output, have far lower divergence than most laser pointers using a lens of that diameter. If the modules raw divergence is 4 mRad, you should be able to get somewhere around .2 mRad divergence using a 25 mm diameter lens which is only 80% filled. If the output has a divergence of 8 mRad, you should get about .4 mRad when expanded to 20 mm diameter output.

At their lowest specified divergence which I cannot guarantee, you could expand the output using a concave lens to only 5 mm diameter and then use a standard ~6 mm diameter G2 lens to collimate the output with, at that beam diameter the divergence could be as low as about .8 mRad which is far lower than most DPSS laser pointers. At 5 mm beam diameter with a raw divergence of 8 mRad (the highest the specifications state they can be) the divergence could be as low as 1.6 mRad which isn't terrible, but more than most DPSS laser pointers.

Note: Without further expanson and collimation, the output has too much divergence for use in a pointer, at least, in my opinion. You will need to further expand the output with a negative focal length concave lens and then collimate that output with another lens such as a G2 PCX aspheric lens which are commonly used in our homemade laser pointers. The larger the diameter the collimation lens (with more expansion prior to it), the lower the output divergence.

Note: The last attached file indicates these have a fundamental wavelength of 1060 nm that is then PPLN doubled to 530 nm which is incorrect, it uses SHG OPSL tech (OPS chip) with an 808 nm laser diode.


Thumbnail, click. Note: The last attachment indicates these units operate at a fundamental wavlength of 1060 nm and then doubled, the laser diode is not 1060 nm, but 808 nm. The document I took the screen capture photo of should not have been worded that way, it is misleading, but I have included it due to the mention of 120 mw of output power (I am sure, only when actively cooled).
Hi, is there any chance of getting one for good price??
Thanks
 




Top