Maker Pro
Maker Pro

need a silicon photodiode

R

Robert Wolcott

Jan 1, 1970
0
I am looking for a silicon photodiode that will work as part of a relative
power meter for a yag laser (IR 1064nm). Does anyone have specific
component suggestions? If it would help I could scan a schematic of the
circuit that the diode plugs into.

Thanks,
Bob
 
S

Sam Goldwasser

Jan 1, 1970
0
Robert Wolcott said:
I am looking for a silicon photodiode that will work as part of a relative
power meter for a yag laser (IR 1064nm). Does anyone have specific
component suggestions? If it would help I could scan a schematic of the
circuit that the diode plugs into.

Yes, the schematic probably would help.

How much power or energy? What is the beam size?

If you're doing more than 50 mW or so (peak or average), either a filter
will be needed reduce the beam intensity, or a phodotiode isn't what
you want.

Assuming this is going into an existing laser, that will have been done
already.

For low relative power under fixed conditions, almost any photodiode will
work as long as its active area is large enough.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header is ignored.
To contact me, please use the Feedback Form in the FAQs.
 
R

Robert Wolcott

Jan 1, 1970
0
Do you know what price range I should expect for one of these?

Thanks,
Bob
 
S

Sam Goldwasser

Jan 1, 1970
0
Robert Wolcott said:
http://oregonstate.edu/~wolcottr/Yag_pictures/pwr meter schematic.jpg

Here is a link to the schematic. The laser is a 30 watt cw yag and the
power meter is behind the HR and a filter. The yag rod is 3mm in diameter
and the existing power meter sensor is missing. I'd like to add a diode
that will work with the existing circuit (plus a resistor or two if needed).

Almost any silicon photodiode with an active area large enough for the
beam. Assuming 3 mm, there are many inexpensive photodiodes available.

If you're in the USA, send me a self addressed stamped envelope and I'll
send you one to try.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header is ignored.
To contact me, please use the Feedback Form in the FAQs.
 
S

Sam Goldwasser

Jan 1, 1970
0
Robert Wolcott said:
Do you know what price range I should expect for one of these?

See my other reply. There are $2 photodiodes from Digikey that should
work just fine.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header is ignored.
To contact me, please use the Feedback Form in the FAQs.
 
R

Robert Wolcott

Jan 1, 1970
0
Thanks, I'll take you up on that. E-mail me your mailing address and I'll
send it off.

Thanks,
Bob
 
R

Robert Wolcott

Jan 1, 1970
0
Sam,

Here is a link that gives a little better idea of the physical construction:

http://oregonstate.edu/~wolcottr/Yag_pictures/

There are a few pictures (CAD and otherwise) and a PDF of a drawing. I
noticed while I was searching the internet the other day that there are
photodiode assemblies that come with the coax connecters attached. I know
that this requires a photodiode, but are they available in configurations
that would fit right into this assembly?

Thanks,
Bob
 
S

Sam Goldwasser

Jan 1, 1970
0
Robert Wolcott said:
Sam,

Here is a link that gives a little better idea of the physical construction:

http://oregonstate.edu/~wolcottr/Yag_pictures/

There are a few pictures (CAD and otherwise) and a PDF of a drawing. I
noticed while I was searching the internet the other day that there are
photodiode assemblies that come with the coax connecters attached. I know
that this requires a photodiode, but are they available in configurations
that would fit right into this assembly?

Nice CAD!

Possibly. But do you want to spend the cost of two 37 cent stamps or
$100 or more to find out? :) Check Thorlabs, for example.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header is ignored.
To contact me, please use the Feedback Form in the FAQs.
 
R

Robert Wolcott

Jan 1, 1970
0
Well, here it is:

http://www.lasercomponents.com/pdf/pdi/pdbv112.pdf#search='PDBV112'

What do you think it would cost? It doesn't seem to be a standard item at
Digikey etc... It is made by the same company as the unit you have
(PDB-V107). I have had a pretty laid back weekend so I have spent my time
researching this stuff :)

Also, do you think there are any people on the laser forum that could use
CAD work in return for equipment/ services trade? I play with lasers as a
hobby and operate on a college student budget. I do have a knack for CAD
design, modeling, and analysis however, and would be more than willing to
work for trade if anyone was interested.

Thanks,
Bob
 
Top