Old 03-05-2017, 01:08 PM #1
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Exclamation LIGHT BLUE 473nm repairs?

ok so im a newb to this page and sorry if i post this in the wrong place ..


Soooo so i have received a DPSS laser from a mate that had it in a stage laser system and its broken and he cant fix it ,, Now ive had a lil experience with lasers and allot of elec experience so im no complete beginner despite my shocking typing lol . i believe it to be a 800mW-1W 473 nm blue DPSS from when i saw it running and ill post some pics in a bit for ref , my question is: Is there any thing specific thats a common " old age " problem with blue dpss lasers that i should be looking out for in specific ill be starting component testing in the next few days eg the peltiers and so far the only way i can see to test the iR LD is with a camera in a box concealed box so i dont kill my eyeballs . theres no definitive markings on it apart from the numbers 5095084 printed on paper connected to the power cable ,, this appears to be a solid and decent unit so here begins my mission to repair it for my self any input would be appreciated .


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Old 03-05-2017, 04:19 PM #2
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Default Re: LIGHT BLUE 473nm repairs?

You need to be a lot more specific. Broken how? What is the model number? Who is the manufacturer? What are the power supply requirements? Do you not have a camera?

"blue laser broke" isn't gonna cut it.
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Old 03-05-2017, 08:40 PM #3
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Default Re: LIGHT BLUE 473nm repairs?

Quote:
Originally Posted by Cyparagon View Post
You need to be a lot more specific. Broken how? What is the model number? Who is the manufacturer? What are the power supply requirements? Do you not have a camera?

"blue laser broke" isn't gonna cut it.
Some pictures of what you have would be helpful on top of a more complete description.
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Old 03-05-2017, 09:50 PM #4
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Default Re: LIGHT BLUE 473nm repairs?

Everything appart from broken how i have answerd above .. Its powering on but not lasing . Theres no definitive details on it eg mod# or brand . And ill be putting pics up soon once i can get time to down scale the buggers for this forrum
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Old 03-06-2017, 04:44 AM #5
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Default Re: LIGHT BLUE 473nm repairs?

Dig up some pics Cyp.
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Old 03-06-2017, 07:41 AM #6
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Default Re: LIGHT BLUE 473nm repairs?

heres some pics
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LIGHT BLUE 473nm repairs?-img_2797.jpg   LIGHT BLUE 473nm repairs?-img_2798.jpg   LIGHT BLUE 473nm repairs?-img_2799.jpg   LIGHT BLUE 473nm repairs?-img_2800.jpg   LIGHT BLUE 473nm repairs?-img_2801.jpg  

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Old 03-06-2017, 08:02 AM #7
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Default Re: LIGHT BLUE 473nm repairs?

So initial tests i have 2.18V going to the ld .
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Old 03-06-2017, 08:03 AM #8
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Default Re: LIGHT BLUE 473nm repairs?

Good boy.
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Old 03-06-2017, 08:46 AM #9
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Default Re: LIGHT BLUE 473nm repairs?

So tests with an ir camera confirm the ir diode is operating and the light path is through the front assembly's . Now im stumped .
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Old 03-06-2017, 09:15 AM #10
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Default Re: LIGHT BLUE 473nm repairs?

All optics , wave modifing rod and partial murrors appear to be complete and un affected . Any suggestions for what else to search for?
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Old 03-06-2017, 09:17 AM #11
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Default Re: LIGHT BLUE 473nm repairs?

As I am sure you are well aware of, only newbies and trolls pretending to be newbies double post.
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Old 03-06-2017, 09:28 AM #12
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Default Re: LIGHT BLUE 473nm repairs?

Double post? And newbie i may be but i joind this site hoping for some possible advice and not to play troll hunter
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Old 03-06-2017, 09:38 AM #13
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Default Re: LIGHT BLUE 473nm repairs?

It could be a number of different things with those DPSS's. The most likely is a crystal misalignment as the IR diode is still operating. As you know, do not observe the IR. Do you see any signs of blue emissions at all?
Also are you sure it is around 800-1000mW of 473nm. If it is then that is one expensive laser.
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Old 03-06-2017, 09:44 AM #14
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Default Re: LIGHT BLUE 473nm repairs?

na no sighn of any blue emissions .. ive encapsulated the laser in a cardboard box for operating powered tests with a sony ccd EVI robot camera with huuuuge zoom in the box closed so i can look around and zoom in .. so yeah aware of iR laser dangers


as for nonalignment of the rod or optics any suggestions to correct ???
cheers for a serious answer
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Old 03-06-2017, 09:55 AM #15
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Default Re: LIGHT BLUE 473nm repairs?

Aligning the crystals is a difficult task. It requires a lot of patience and fine tuning. There are members on here that have done the job of realigning, and would probably be more than happy to guide you through it. But first it important to understand what the crystals are and how your laser actually works. As you know, the 473 is a dpss. You've already identified that there is a pump diode which will be at 808nm. Next there will be a Nd:YAG crystal that when pumped by the 808, will produce the 946nm line. Lastly you have a NLO crystal, which will frequency double the 946nm to produce 473nm. The NLO has very strict phase matching to comply with otherwise you will get no or very little 473nm output. The problem is we don't know if any of the crystals are damaged or if it is the crystals at all. If the pump diode is not outputting enough then the lasing threshold will not be met for the 473nm to occur. I own a 473 myself, but have never had to realign the crystals.
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Old 03-06-2017, 10:04 AM #16
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Default Re: LIGHT BLUE 473nm repairs?

Quote:
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Double post? And newbie i may be but i joind this site hoping for some possible advice and not to play troll hunter
OK, don't double post then.
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To shorten my signature I have moved most of my laser related web links to this forum page, the second post in that thread shows most of my builds... Alaskan's Laser Links: http://laserpointerforums.com/f44/al...ml#post1449395


Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

Useless troll fighting.
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