Beam Splitter & Combiner

Beam Splitter & Combiner

Beam splitters allow a beam to be split into two beams of differing power however the most popular power split is 50:50 at a 45° incidence angle.

Beam Splitters

Beam splitters allow a beam to be split into two beams of differing power, however, the most popular power split is 50:50 at a 45° incidence angle. They are mainly used in laser bonding, fiber laser welding, scientific research, education, communication and etc.

Beam splitters allow a beam to be split into two beams of differing power, however, the most popular power split is 50:50 at a 45° incidence angle. They are mainly used in laser bonding, fiber laser welding, scientific research, education, communication and etc.

1. STJ Series Beam Splitters

  • Material: BK7/Fused Silica
  • Diameter tolerance: ±0.1 mm
  • Thickness tolerance: ±0.15 mm
  • Flatness: λ/2/inch per@ 632.8 nm
  • Parallelism:<1arc min
  • Surface quality: 40-20
  • Clear aperture: >90%
  • Bevel:<0.2×45°
  • Coating: dielectric coating; Incident angle: 45°
  • Reflection/transmission (R/T): 50/50

Standard Beam Splitters

Part No. Diameter (mm) Thickness (mm) Wavelength (nm)
STJ-XXXX-BP-12.5-3 12.5 3 355
STJ-XXXX-BP-30-3 30 3 1064/650
STJ-XXXX-BP-30-4 30 4 1064/650
STJ-XXXX-BP-30-5-6 30 5 1064/650
STJ-XXXX-BP-30-5 30 5 1064
STJ-XXXX-BP-45-3 45 3 1064
STJ-XXXX-BP-30-30-4 30x30 4 1064
STJ-XXXX-BP-30-34-4 30x34 4 1064
STJ-XXXX-BP-51-30-3 51x30 3 1064
STJ-XXXX-BP-50-50-3 50x50 3 468

2. CO2 Laser Beam Splitter

The polarization needs to be considered when specifying a beam splitter otherwise the reflected and transmitted beams will not have the correct power. We have developed a special 'polarization insensitive' coating which eliminates this problem for the 50:50 case.

  • Advanced in-house design
  • Up to 500W/cm2 power handling
  • High quality laser grade material

The following standard beam splitter are available.

Model Material Diameter mm ET mm Transmission % Reflectance % Coating
BS-10.6-10PIB3-45 ZnSe 25.4 3 50 50 AR/50%-PIB
BS-10.6-10ZPF3-50-P ZnSe 25.4 3 50 50 AR/50%-45P
BS-10.6-10ZPF3-50-R ZnSe 25.4 3 50 50 AR/50%-45R
BS-10.6-10ZPF3-50-S ZnSe 25.4 3 50 50 AR/50%-45S
BS-10.6-10ZPF4-99-R ZnSe 25.4 3 1 99 AR/99%-45R
BS-10.6-15PIB3-45 ZnSe 38.05 3 50 50 AR/50%-PIB
BS-10.6-15PIB4-45 ZnSe 38.05 4 50 50 AR/50%-PIB
BS-10.6-15ZPF3-10-R ZnSe 38.05 3 90 10 AR/10%-45R
BS-10.6-15ZPF3-1-R ZnSe 38.05 3 99 1 AR/1%-45R
BS-10.6-15ZPF3-50-P ZnSe 38.05 3 50 50 AR/50%-45P
BS-10.6-15ZPF3-50-R ZnSe 38.05 3 50 50 AR/50%-45R
BS-10.6-15ZPF3-50-S ZnSe 38.05 3 50 50 AR/50%-45S
BS-10.6-15ZPF3-5-R ZnSe 38.05 3 95 5 AR/5%-45R
BS-10.6-15ZPF4-50-R ZnSe 38.05 4 50 50 AR/50%-45R
BS-10.6-15ZPF5-50-R ZnSe 38.05 5 50 50 AR/50%-45R
BS-10.6-20PIB5-45 ZnSe 50.8 5 50 50 AR/50%-PIB

Remark:

  • The above items are flat/flat;
  • The angle of incidence is 45 degree;
  • The above items are polarisation-insensitive.
Model Number Diameter Thickness Reflectance Polarization
BS-10.6-BSZ-1012-50-P 1.000" 0.120" 50% ±3% P
BS-10.6-BSZ-1012-50-S 1.000" 0.120" 50% ±3% S
BS-10.6-BSZ-1012-50-U 1.000" 0.120" 50% ±3% U
BS-10.6-BSZ-1516-50-P 1.500" 0.160" 50% ±3% U
BS-10.6-BSZ-1516-50-S 1.500" 0.160" 50% ±3% S
BS-10.6-BSZ-1516-50-U 1.500" 0.160" 50% ±3% U
BS-10.6-BSZ-2020-50-P 2.000" 0.200" 50% ±3% P
BS-10.6-BSZ-2020-50-S 2.000" 0.200" 50% ±3% S
BS-10.6-BSZ-2020-50-U 2.000" 0.200" 50% ±3% U

Note: For "U" polarization: This is an unpolarized beam splitter. It is not a polarization-insensitive beam splitter.

Beam Combiner

1. Beam Combiner for CO2 Laser (Wavelength 10.6um)

  • Average transmission > 99%@10.6um, Average reflection > 85%@650nm (or 633nm)
  • Diameter Tolerance:+0/-0.13mm
  • Thickness:±0.25mm
  • Side1:T>99%@10.6um,45AOI
  • Side2:T>99%@10.6um R>85%@650nm or 633nm 45AOI
  • Flatness:λ/20 @10.6um

Part No. Material Diameter (inch) Thickness (mm) Remark
BCZ-0.5-2-650 ZnSe 0.5 2 MaxT10.6µm/MaxR650nm
BCZ-0.75-2-650 ZnSe 0.75 2 MaxT10.6µm/MaxR650nm
BCZ-1.0-3-650 ZnSe 1.0 3 MaxT10.6µm/MaxR650nm
BCZ-1.1-3-650 ZnSe 1.1 3 MaxT10.6µm/MaxR650nm
BCZ-1.5-3-650 ZnSe 1.5 3 MaxT10.6µm/MaxR650nm
BCZ-1-3-9.4-650 ZnSe 1.0 3 MaxT9.5µm/MaxR650nm
BCZ-20-2-650 ZnSe 20mm 2 MaxT10.6µm/MaxR650nm
BCZ-0.5-2-633 ZnSe 0.5 2 MaxT10.6µm/MaxR633nm
BCZ-0.75-2-633 ZnSe 0.75 2 MaxT10.6µm/MaxR633nm
BCZ-1-3-633 ZnSe 1 3 MaxT10.6µm/MaxR633nm
BCZ-1.5-3-633 ZnSe 1.5 3 MaxT10.6µm/MaxR633nm
Model Number Diameter Thickness Reflectance/Wavelength Wedge
BCZ-0508-AR 1.000" 0.120" 90% @ 0.633µm < 3 minutes
BCZ-0512-AR 1.000" 0.120" 90% @ 0.633µm < 3 minutes
BCZ-0708-AR 1.000" 0.120" 90% @ 0.633µm < 3 minutes
BCZ-0712-AR 1.500" 0.160" 90% @ 0.633µm < 3 minutes
BCZ-1012-AR 1.500" 0.160" 90% @ 0.633µm < 3 minutes
BCWZ-1012-AR 1.500" 0.160" 90% @ 0.633µm 12 minutes ±2 minutes
BCPZ-1012-AR 2.000" 0.200" 90% @ 0.633µm < 10 seconds
BCZ-1112-AR 2.000" 0.200" 90% @ 0.633µm < 3 minutes
BCZ-1512-AR 2.000" 0.200" 90% @ 0.633µm < 3 minutes
BCZ-2012-AR 2.000" 0.200" 90% @ 0.633µm < 3 minutes
BCZ-2520-AR 2.000" 0.200" 90% @ 0.633µm < 3 minutes

Note:

  • Transmission: > 99.1% average @ 10.6µm with reflectance > 90% average @ 633nm (RED)
  • For 45° Angle of Incidence operation
  • Other red diode wavelengths available in most sizes above from stock. Specify 650nm, 670nm, or 680nm
Part number Wavelength (T/R), nm Dia. mm Thk, mm
STY-LBC-T10.6/R650-12.7x3 T10.6/R650 12.7 2
STC-LBC-T10.6/R633-20x2* T10.6/R633 20 2
STY-LBC-T10.6/R650-20x3 T10.6/R650 20 3
STC-LBC-T10.6/R633-25x2* T10.6/R633 25 2
STY-LBC-T10.6/R650-25.4x3 T10.6/R650 25.4 3
STY-LBC-T10.6/R590-25.4x3 T10.6/R590 25.4 3
STY-LBC-T10.6/R650-38.1x3 T10.6/R650 38.1 3
STY-LBC-T10.6/R650—50.8x3 T10.6/R650 50.5 3

Remark: * T>98%@10.6um, R>85%@633nm, R>80%@650nm

2. Beam Combiner for Nd:YAG Laser (wavelength 1064nm/532nm)

2.1 BCBK Series Beam Combiners at 1064nm

  • Average transmission > 99%@1064nm, Average reflection > 85%@650nm
  • Diameter Tolerance:+0/-0.13mm
  • Thickness:±0.25mm
  • Side1:T>99%@1064nm,45AOI
  • Side2:T>99%@1064nm,R>85%@650nm,45AOI
  • Flatness: λ/2 @1064nm per 25mm dia
Part No. Material Diameter (inch) Thickness (mm)
BCBK-0.5-2 BK7 0.5 2
BCBK-0.75-2 BK7 0.75 2
BCBK-0.75-3 BK7 0.75 3
BCBK-1.0-3 BK7 1.0 3
BCBK-1.0-3.4 BK7 1.0 3.4
BCBK-1.1-3 BK7 1.1 3
BCBK-1.5-3 BK7 1.5 3

2.2 STJ Series Laser Beam Combiners at 1064nm/532nm

Laser beam combiner is one kind of partial reflectors, which is designed to create a single, combined beam by combining beams of two (or more than two) wavelengths through transmission or reflection.

Laser beam combiner could be used in various fields, including laser marking, welding, medical treatment, military, teaching, communication and other fields.

  • Diameter tolerance: +0/-0.1mm
  • Thickness tolerance : ±0.15mm
  • Side 1: T>99%@1064nm,45 AOI
  • Side 2: T>99%@1064nm R>85%@650nm,45AOI
  • Precision flatness: λ/4 per inch per @632.8nm
Part No. Material Diameter (mm) Thickness (mm) Wavelength (nm)
STJ-1064-BC-12.7-2 BK7 12.7 2 1064T650R
STJ-1064-BC-15-2.5 BK7 15 2.5 1064T650R
STJ-1064-BC-20-2-3 BK7 20 2-3 1064T650R
STJ-1064-BC-25.4-3 BK7 25.4 3 1064T650R
STJ-1064-BC-30-2.5 BK7 30 2.5 1064T650R
STJ-1064-BC-30-3 BK7 30 3 1064T650R
STJ-1063-BC-38.1-3 BK7 38.1 3 1064T650R
STJ-1064-BC-40-3 BK7 40 3 1064T650R
STJ-1064-BC-45-3 BK7 45 3 1064T650R
STJ-532-BC-20-3 BK7 20 3 532T650R
STJ-532-BC-20-5 BK7 20 5 532T650R
STJ-532-BC-25-3 BK7 25 3 532T650R
STJ-532-BC-25-5 BK7 25 5 532T650R
STJ-1064/532-85-60-6 BK7 85X60 6 1064 & 532T468R

2.3 Beam Combiner for Green Laser (532nm)

  • Diameter Tolerance:+0/-0.13mm
  • Thickness:±0.25mm
  • Side1:T>99%@532nm,45AOI
  • Side2:T>99%@532nm,R>85%@650nm,45AOI
  • Flatness: λ/2 @560nm per 25mm dia
Part No. Material Diameter (inch) Thickness (mm)
BCBK-1-3-532T650R BK7 1 3

3. Various Beam Combiners

Rectangular

Part number Wavelength
(T/R), nm
Length,mm Width, mm Thk, mm
STY-LBC-T915/R468-56X40X5 T915/R468 56 40 5
STY-LBC-T1064/R650-135X95X3 T1064/R650 135 95 3
STY-LBC-T1064/R650-56X40X5 T1064/R650 56 40 5
STY-T1200+3000/R468+915-40X30X2 T1200+3000/R468+915 40 30 2

Round

Part number Wavelength (T/R), nm Dia. mm Thk, mm
STY-LBC-T1064/R650-20x2 T1064/R650 20 2
STY-LBC-T1064/R650-20x2H T1064/R650 20 2
STY-LBC-T1064/R650-20x3 T1064/R650 20 3
STY-LBC-T1064/R650-20x3H T1064/R650 20 3
STY-LBC-T355/R650-20x3H T355/R650 20 3
STY-LBC-T1064/R650-25X2 T1064/R650 25 2
STY-LBC-T1064/R650-25X2H T1064/R650 25 2
STY-LBC-T1064/R650-30X5 T1064/R650 30 5
STY-LBC-T532/R650-30X5H T532/R650 30 5
STY-LBC-T1064/R650-30X5H T1064/R650 30 5
STY-LBC-T355/R650-30X5H T355/R650 30 5
STY-LBC-T532/R590-76.2X5.08H T532/R590 76.2 5.08
STY-LBC-T355/R590-76.2X5.08H T355/R590 76.2 5.08

Remark: H in the part number means for high-power application.

4. Reverse Beam Combiner

Reverse YAG Beam Combiner refers to an optic component used to transmit a short wavelength beam (eg. 650nm) at an angle of incidence of 45º while reflecting a long wavelength 1064nm.

4.1 BCBK Series Beam Combiners at 1064nm

  • Diameter Tolerance:+0/-0.13mm
  • Thickness:±0.25mm
  • Side1:T>99%@650nm,45AOI
  • Side2:T>99%@650nm R>99%@1064nm,45AOI
  • Flatness: λ/2 @1064nm per 25mm dia
Part No. Material Diameter (inch) Thickness (mm)
BCBK-1-3.5-1064R BK7 1 3.5
BCBK-1-7-1064R BK7 1 7
BCBK-2-6.35-1064R BK7 2 6.35

4.2 STJ Series Reverse Beam Combiner at 1064nm

  • Diameter tolerance: +0/-0.1mm
  • Thickness tolerance: ±0.15mm
  • Side 1: T>99%@650nm,4 5AOI
  • Side 2: T>99%@650nm, R>99%@1064nm, 45AOI
  • Precision flatness: λ/2 per inch per @632.8nm
Part No. Material Diameter (mm) Thickness (mm) Wavelength (nm)
STJ-1064-RBC-25.4-3.5 BK7 25.4 3.5 1064R650T
STJ-1064-RBC-40-5 BK7 40 5 1064R650T
STJ-1064-RBC-45-5 BK7 45 5 1064R650T
STJ-1064-RBC-50.8-6.4 BK7 50.8 6.4 1064R650T
STJ-1064-RBC-43-30-3 BK7 43x30 3 1064R650T
STJ-1064-RBC-43-30-5 BK7 43x30 5 1064R650T

Reference: Calculation of Beam Shift

Where,

  • α is angle of incidence
  • n is index of refraction
  • t is thickness
  • d is displacement of the material

For example: BCZ-1-3, d=1mm; BCBK-1-3, d=0.8mm

5. Beam Combiner Modules

We also provide beam combiner modules (or called as red aiming module), which is designed for the use with the fiber lasers (or Nd:YAG lasers etc). Inside there is a beam combiner. A red diode is vertically fixed and the fiber laser beam horizontally goes through the module.

beam combiner module

The beam combiner module STM-1064/650 is designed for combining 1064nm and 650nm laser beams. The matched red diode is ST-SD650-5G1 and the beam combiner is the diemsnion Φ20x1.5mm (or Φ20x2mm, Φ20x3mm etc) such as STJ-1064-BC-20-2. For other laser wavelengths, just select other beam combiners and the beam combiner modules at other wavelengths are available upon request. Please contact us for more information.

beam combiner module