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Entry  Tue Dec 20 15:49:21 2011, steve, Update, PEM, optical table top 05150901.PDF
    Reply  Thu Jan 12 10:11:59 2012, steve, Update, PEM, optical table top with 1" wall 101122012atc.PDF
       Reply  Wed Jan 18 12:38:44 2012, steve, Update, PEM, Acrylic plexiglass transmittance Acrylite-Gp.pptxroscogel_red#26_film.pdf
          Reply  Mon Jan 30 16:18:51 2012, steve, Update, PEM, Roscolux colored film transmittance at 1064 nm 
Message ID: 6210     Entry time: Wed Jan 18 12:38:44 2012     In reply to: 6190     Reply to this: 6237
Author: steve 
Type: Update 
Category: PEM 
Subject: Acrylic plexiglass transmittance 

Acrylite-Gp.pptx

Transparent- clear plexyglass from tree different sources were measured in 1064 and 532 nm light.

Samples: a, clear Acrylic-GP 0F00  from Ridout Plastics in thickness 0.7" ,  made by  Evonic Ind

                   b, clear cast acrylic from Mc Master Carr in thickness 0.94" , likely  made by Reynolds-Cast

                   c, clear cell cast  plexyglass from Delvie's Plastics - Utah in thickness  0.93" , maker not known

PMC reflected beam was used at 92 mW and 6 mm diameter at incident angle 0-25 degrees.

All tree samples agreed on Transmittance of ~90%, Reflectivity ~3-4% and calculated Adsorption ~6-7%

 

Transparent Colored Acrylic orange-amber #2422   from www.eplastics.com in 0.12" thickness gave  T 96%,  R 1% and  Ab-calc ~3% in the beam of 92 mW 1064  nm at 6 mm diameter.

 

Transparent , colored   Light Red #26 thin film filter   policarbonate-polyester   0.002" thick   from Roscolux measured T 81% of 115 mW 1064 nm

 

Now I changed power meter FieldMate to Ophir and the light source to laser pointer 2.2 mW  ~532 nm  with 1-2 mm beam diameter.

Orange - amber #2422  sample, 0.12" thick,  T 1% ,  R 4%  and  Ab-calculated ~95%, estimated visibility  ~50% It does cut out the green at this low power level.

 Light red #26  sample  T 0.5%  at 2.5 mW of 532 nm . The transparent green is not visible.  The softening point of this sandwiched polycarbonate-polyecter filter is 160C. Estimated VLT of this film ~40%

 

SUMMERY:

Clear and colored acrylics'  @ 1064 nm  transmittance 90% or higher  regardless of thickness. Softenig point 115 degrees C

Colored acrylic and colored policarbonate film are adsorbing the low power green and they  transmit the 1064nm beam.

Options to consider: a, acrylic laser safety shield liner of  0.125" thick inside of 1" thick clear acrylic  box, OD +5 @1064 and OD +4 @ 532nm,  amber color VLT 27%,  150$/sqft

                                      b, thin metal liner for 1" wall acrylic box, VLT 0%

                                     

 

Attachment 2: roscogel_red#26_film.pdf  282 kB  Uploaded Thu Jan 19 16:29:47 2012  | Show | Hide all | Show all
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