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Economy Visible Beamsplitters


  • Designed for use with Unpolarized Light in the 450 - 650 nm Range
  • Optimized to Provide a 50:50 or 30:70 Split Where Polarization
    Sensitivity is Not a Consideration

EBP1

(Ø1")

EBP2

(Ø2")

Related Items


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Common Specifications
Substrate Material Soda Lime Glass
Coating (One Side) Refractory Oxide Dielectric
Thickness (Nominal) 1 mm
Surface Quality 80-50 Scratch-Dig
as per MIL-013830A
Clear Aperture >90% of Diameter
Temperature Range -50 to 80 °C
KCP05 Centering Plate Application
Click to Enlarge
EBP1 economy beamsplitter mounted in a KM100 mirror mount using an SM1S6M 6 mm optic spacer.

Thorlabs' Economy Beamsplitters, which have an exposed oxide coating on one side and are uncoated on the other side, are designed to have either a 50:50 or 30:70 splitting ratio in the visible spectral range (450 - 650 nm) when used with unpolarized light incident at 45° and oriented such that the coated surface faces the source. Please note that the Fresnel reflections from the uncoated back surface of these economy beamsplitters can lead to interference effects in the reflected beam. For applications sensitive to these effects, consider using a cube beamsplitter.

The graphs below shows reflectivity and transmission data for these Economy Visible Beamsplitters in the specified wavelength range. Extended plots showing reflectivity in the 400 - 2300 nm spectral range are available on the Graphs tab.

Because these beamsplitters are just 1 mm thick, significant stress results if they are placed into optic mounts that use setscrews. Our Optic Spacers provide a wide, rigid surface against which the setscrew can be tightened without causing damage to the optic.

Item #EBS1EBP1EBS2EBP2
SubstrateSoda Lime Glass
Diameter1" (25.4 mm) 2" (50.8 mm)
Diameter Tolerance+0.0/-0.25 mm+0.0/-0.5 mm
Thickness (Nominal)1 mm
Splitter Ratio50:5030:7050:5030:70
Splitter Ratio Tolerance
for 450 - 650 nm (AOI = 45°)
Transmittance: 50% ± 10%
Reflectance: 50% ± 10%
Transmittance: 70% ± 10%
Reflectance: 30% ± 10%
Transmittance: 50% ± 10%
Reflectance: 50% ± 10%
Transmittance: 70% ± 10%
Reflectance: 30% ± 10%
Surface Quality80-50 Scratch-Dig as per MIL-013830A
Clear Aperture>90% of Diameter
Temperature Range-50 to 80 °C

45° AOI

The highlighted regions represent the specified wavelength range (450 - 650 nm) of these Economy Visible Beamsplitters. The transmission and reflection outside of this region may vary for each coating run.

EBS Plot
Click to Enlarge

Click Here for Raw Data

EBS Plot
Click to Enlarge

Click Here for Raw Data

0° AOI

These Beamsplitters were designed for performance at 45° AOI. The data shown below is for informational purposes only.

EBP Plot
Click to Enlarge

Click Here for Raw Data

EBS Plot
Click to Enlarge

Click Here for Raw Data

Thorlabs' portfolio contains many different kinds of beamsplitters, which can split beams by intensity or by polarization. We offer plate and cube beamsplitters, though other form factors exist, including pellicle and birefringent crystal. Many of our beamsplitters come in premounted or unmounted variants. Below is a complete listing of our beamsplitter offerings. To explore the available types, wavelength ranges, splitting/extinction ratios, transmission, and available sizes for each beamsplitter category, click More [+] in the appropriate row below.

Non-Polarizing Beamsplitters

Plate Beamsplitters
Cube Beamsplitters
Pellicle Beamsplitters
  • 45° AOI Unless Otherwise Noted

Polarizing Beamsplitters

Plate Beamsplitters
Cube Beamsplitters
Birefringent Crystal Beamsplitters
  • Mounted in a protective box, unthreaded ring, or cylinder.
  • Available unmounted or mounted in a protective box or unthreaded cylinder.

Other Beamsplitters

Other Beamsplitters

Posted Comments:
yusefzadib  (posted 2017-05-03 16:06:18.607)
Hi Is there any product that can combine tow identical (same wavelengths) beam? Best Regard Mahdi
tfrisch  (posted 2017-05-03 11:54:24.0)
Hello, thank you for contacting Thorlabs. I will reach out to you about your application and whether the beams are coherent and whether constructive interference could be used. However, there is not an optic that can transmit fully in one direction and reflect fully from the other direction at the same wavelength.
yusefzadib  (posted 2017-05-03 15:39:53.327)
Hi What will happen If the beam is applied to the non-coated side? Is it still divides beam at ratio of 50 to 50? I had to apply beam to non-coated side. Best Regards Mahdi
tfrisch  (posted 2017-05-03 11:42:49.0)
Hello, thank you for contacting Thorlabs. I will reach out to you directly, but the biggest impact will be that the ghost beams will contain slightly more power if the beamsplitter is used in reverse. Applications where light passes both directions through a beam splitter are common.
smiloaf  (posted 2016-11-28 18:19:20.63)
Shining a solid state diode pulsed laser straight through one of the EBS2 beamsplitters caused a banding effect as seen here - http://imgur.com/a/sLW8m Is this caused by the material of the splitter itself, and would it be resolved if, for example, a beamsplitter cube was used instead? Thanks.
tfrisch  (posted 2016-11-29 01:24:48.0)
Hello, thank you for including that image. It looks like an interference effect due to multiple surface reflections off of the uncoated back surface. A cube beam splitter would help mitigate these interference effects.
zhangjun.wang  (posted 2016-07-11 18:15:46.323)
The splitter ratio of EBP2 is 30:70 (R:T). Do you have a Beam Splitter with 70:30 (R:T) splitter ratio?
bw  (posted 2016-01-25 15:36:13.25)
I am looking for the old "half-silvered mirror" metallized beam-splitter for use with quadrature interferometry. A protective coating over the metallization would be welcome and parallel surfaces (no wedge) are needed. I also need a dielectric reflection from the back, but I can generate that with plain glass if all of yours are AR coated. Most of your products obviously will not work, but others don't seem to say explicitly whether they utilize the metallization layer that I need. Do you, in fact, offer metallized beam-splitters? If so, what are some of their model numbers (1 inch optics preferred).
besembeson  (posted 2016-02-01 10:28:06.0)
Response from Bweh at Thorlabs USA: We don't have such half-slivered mirrors as stock items for quadrature interferometry. We can add a dielectric coating as required and we can provide a custom solution based on your requirements. I will follow-up with you.
roger.ding  (posted 2015-08-12 00:30:26.787)
An option to buy these thin economy beamsplitters mounted in a thicker housing to make mounting into something like the KM100 easier (similar to how the pellicle beamsplitters are mounted in a protective ring) would be helpful. I've looked at the SM1AB1, but I think it would cut the clear aperture down quite a bit when using the beamsplitter at 45 degrees.
besembeson  (posted 2015-08-18 08:42:05.0)
Response from Bweh at Thorlabs USA: We do have optics spacers (https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_ID=4085) that you can use in this case. The optic is placed into the KM100 followed by a spacer and the nylon-tipped setscrew locks to the spacer.
bradford.behr  (posted 2015-04-17 13:20:31.9)
What is the specification for the surface figure (e.g. lambda/4) for these beamsplitters? I see the spec for scratch/dig, but not the wavefront flatness. Thanks!
besembeson  (posted 2015-04-30 02:50:25.0)
Response from Bweh at Thorlabs USA: These would typically be 2 lambda (peak to valley).
zhangzyster  (posted 2015-02-21 23:09:58.47)
Hi, do you offer other size options? I need this half/half splitter about 100mm*150mm in size.
besembeson  (posted 2015-02-26 04:13:05.0)
Response from Bweh at Thorlabs USA: We can provide custom versions of this beamsplitter. I will followup with you by email for quotation.
user  (posted 2014-01-10 17:06:54.21)
Hello, I have 2 questions concerning the economic beam splitters (I am more interested in the EBP version): - Do they work under normal incidence? - In this condition, they should be insensitive to polarisation, right?
jlow  (posted 2014-01-15 08:39:28.0)
Response from Jeremy at Thorlabs: The beamsplitter is meant to be used with 45° angle of incidence (AOI). At small AOI, the beam splitting ratio will change significantly and the spectral response will not be as flat in the visible range.
wwbsghr  (posted 2013-08-05 20:02:34.377)
what's the Damage Threshold of economic beamspliter EBS2 and EBP2?
tcohen  (posted 2013-08-08 15:32:00.0)
Response from Tim at Thorlabs: At this time we have a conservative theoretical value of 1W/cm^2. We are continuing to increase our knowledge-base on damage thresholds for optics, but in the meantime if power handling is a concern, we do have other higher power beamsplitters. We will contact you to discuss your requirements.
user  (posted 2013-05-01 16:59:11.723)
the % reflection scale of your graph doesnt make sense, it is backwards
sharrell  (posted 2013-05-02 11:47:00.0)
Response from Sean at Thorlabs: Thank you for pointing out that our graph was confusing. The data was correct-- there were separate lines for reflection and transmission. I made new graphs for this page so that each type of beamsplitter has it's own plot; I hope that this makes the data easier to understand.
Greg  (posted 2010-04-29 09:36:14.0)
A response from Greg at Thorlabs to wwarger: We now have a graph from 400 nm to 2300 nm on the Overview tab. Data for this graph can be downloaded by clicking on it.
Adam  (posted 2010-04-28 12:11:46.0)
A response from Adam at Thorlabs to wwarger: We are working on getting the data for the EBS1 at this range as well. We will post the data on the web as soon as we get the appropriate data. I will send you the data we have on the EBP1 directly.
wwarger  (posted 2010-04-28 10:16:44.0)
It would be extremely helpful if the previously requested spec from 1064 - 2000 nm was posted on the website.
apalmentieri  (posted 2010-02-02 14:43:57.0)
A response form Adam at Thorlabs to Nick: I am currently working on getting you a scan of the EBP1 that will provide you with the data you are looking for. I will send this to you via your email address.
nick  (posted 2010-02-02 14:21:56.0)
Hello, Can you tell me what its T/R would be from 1064 to 2000 nm? Thank you, Nick

30:70 Economy Beamsplitters

EBS Plot
Click to Enlarge
Click Here for Raw Data
For a plot showing the performance over the 400 to 2300 nm range, please see the Graphs Tab above.
Item # EBP1 EBP2
Diameter 1" (25.4 mm) 2" (50.8 mm)
Diameter Tolerance +0.0/-0.25 mm +0.0/-0.5 mm
Splitter Ratio Tolerance
for 450 - 650 nm (AOI = 45°)
Transmittance: 70% ± 10%
Reflectance: 30% ± 10%
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
EBP1 Support Documentation
EBP1Economy 30:70 Beamsplitter, Ø1", AOI: 45°
$33.89
Today
EBP2 Support Documentation
EBP2Economy 30:70 Beamsplitter, Ø2", AOI: 45°
$73.02
Today

50:50 Economy Beamsplitters

EBS Plot
Click to Enlarge
Click Here for Raw Data
For a plot showing the performance over the 400 to 2300 nm range, please see the Graphs Tab above.
Item #EBS1EBS2
Diameter1" (Ø25.4 mm)2" (Ø50.8 mm)
Diameter Tolerance+0.0/-0.25 mm+0.0/-0.5 mm
Splitter Ratio Tolerance
for 450 - 650 nm (AOI = 45°)
Transmittance: 50% ± 10%
Reflectance: 50% ± 10%
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
EBS1 Support Documentation
EBS1Economy 50:50 Beamsplitter, Ø1", AOI: 45°
$33.89
Today
EBS2 Support Documentation
EBS2Economy 50:50 Beamsplitter, Ø2", AOI: 45°
$73.02
Today
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