Alaskan
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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).
OPSL Technology info:
OPTICALLY PUMPED SEMICONDUCTOR LASERS: Green OPSLs poised to enter scientific pump-laser market
The advent of stand-alone 532 nm optically pumped semiconductor lasers delivering 2 and 5 W provides an attractive new option for pumping Ti:sapphire-based femtosecond systems and other low noise scientific applications.
www.laserfocusworld.com
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).
Attachments
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