Select Website
EUROPE
    Select website

    Your location is set on :

    EUROPE


Language
lang united-kingdom

    Language is set on :

    united-kingdom

    Change to :

  • germany
  • france
Search
Advanced Search
Cart
quotation icon My Quote

Contact us
+33-1-6918-1700

Broadband Polarizing Beamsplitters

PBSW

More about
Broadband Polarizing Beamsplitters
In stock
SKU
PBSW
Broadband Polarizing Beamsplitters provides wide band polarizing. Polarizing beamsplitters consist of two right angle prisms. One of them is coated with dielectric multi-layer polarizing coating on the hypotenuse face.
Add to Wish List
custom product
Customize product
Filters
Enabled filters :
Remove all filters
Name Design wavelength Length Material Delivery Price Add to cart
i
Broadband Polarizing Beamsplitter Cube 20mm 380 - 750nm
PBSW-20-3/7 		380 - 750nm 20mm SK2
6-12 weeks
€638.80
Material SK2
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 380 - 750nm
A＝B＝C 20mm
Transmittance of P polarized light ＞92% (average with respect to wavelength.)
Reflectance of S polarized light ＞95% (average with respect to wavelength.)
Extinction ratio of transmission　(Ts:Tp) 1:500*
Availability Please contact
i
Broadband Polarizing Beamsplitter Cube 15mm 450 - 1080nm
PBSW-15-4/10 		450 - 1080nm 15mm SF15
1 week
€437.50
Material SF15
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 450 - 1080nm
A＝B＝C 15mm
Transmittance of P polarized light ＞92% (average with respect to wavelength.)
Reflectance of S polarized light ＞95% (average with respect to wavelength.)
Extinction ratio of transmission　(Ts:Tp) 1:500*
Availability Please contact
i
Broadband Polarizing Beamsplitter Cube 12.7mm 1000 - 2000nm
PBSW-12.7-10/20 		1000 - 2000nm 12.7mm SF15
6-12 weeks
€424.30
Material SF15
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 1000 - 2000nm
A＝B＝C 12.7mm
Transmittance of P polarized light ＞94% (average with respect to wavelength.)
Reflectance of S polarized light ＞95% (average with respect to wavelength.)
Extinction ratio of transmission　(Ts:Tp) 1：300*
Availability Please contact
i
Broadband Polarizing Beamsplitter Cube 15mm 235 - 265nm
PBSW-15-250 		235 - 265nm 15mm Synthetic fused silica
6-12 weeks
€519.50
Material Synthetic fused silica
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 235 - 265nm
A＝B＝C 15mm
Transmittance of P polarized light ＞85%
Reflectance of S polarized light ＞90%
Extinction ratio of transmission　(Ts:Tp) 1：100
i
Broadband Polarizing Beamsplitter Cube 12.7mm 330 - 370nm
PBSW-12.7-350 		330 - 370nm 12.7mm Synthetic fused silica
1 week
€471.40
Material Synthetic fused silica
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 330 - 370nm
A＝B＝C 12.7mm
Transmittance of P polarized light ＞85%
Reflectance of S polarized light ＞95%
Extinction ratio of transmission　(Ts:Tp) 1：100
i
Broadband Polarizing Beamsplitter Cube 10mm 450 - 650nm
PBSW-10-550 		450 - 650nm 10mm BK7
6-12 weeks
€268.70
Material BK7
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 450 - 650nm
A＝B＝C 10mm
Transmittance of P polarized light ＞85%
Reflectance of S polarized light ＞85% (average with respect to wavelength.)
Extinction ratio of transmission　(Ts:Tp) 1：200
i
Broadband Polarizing Beamsplitter Cube 20mm 450 - 650nm
PBSW-20-550 		450 - 650nm 20mm BK7
6-12 weeks
€403.10
Material BK7
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 450 - 650nm
A＝B＝C 20mm
Transmittance of P polarized light ＞85%
Reflectance of S polarized light ＞85% (average with respect to wavelength.)
Extinction ratio of transmission　(Ts:Tp) 1：200
i
Broadband Polarizing Beamsplitter Cube 15mm 750 - 850nm
PBSW-15-800 		750 - 850nm 15mm BK7
1 week
€304.50
Material BK7
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 750 - 850nm
A＝B＝C 15mm
Transmittance of P polarized light ＞92%
Reflectance of S polarized light ＞97%
Extinction ratio of transmission　(Ts:Tp) 1：200
i
Broadband Polarizing Beamsplitter Cube 12.7mm 380 - 750nm
PBSW-12.7-3/7 		380 - 750nm 12.7mm SK2
1 week
€377.10
Material SK2
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 380 - 750nm
A＝B＝C 12.7mm
Transmittance of P polarized light ＞92% (average with respect to wavelength.)
Reflectance of S polarized light ＞95% (average with respect to wavelength.)
Extinction ratio of transmission　(Ts:Tp) 1:500*
Availability Please contact
i
Broadband Polarizing Beamsplitter Cube 10mm 450 - 1080nm
PBSW-10-4/10 		450 - 1080nm 10mm SF15
6-12 weeks
€358.30
Material SF15
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 450 - 1080nm
A＝B＝C 10mm
Transmittance of P polarized light ＞92% (average with respect to wavelength.)
Reflectance of S polarized light ＞95% (average with respect to wavelength.)
Extinction ratio of transmission　(Ts:Tp) 1:500*
Availability Please contact
i
Broadband Polarizing Beamsplitter Cube 20mm 450 - 1080nm
PBSW-20-4/10 		450 - 1080nm 20mm SF15
1 week
€638.80
Material SF15
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 450 - 1080nm
A＝B＝C 20mm
Transmittance of P polarized light ＞92% (average with respect to wavelength.)
Reflectance of S polarized light ＞95% (average with respect to wavelength.)
Extinction ratio of transmission　(Ts:Tp) 1:500*
Availability Please contact
i
Broadband Polarizing Beamsplitter Cube 15mm 1000 - 2000nm
PBSW-15-10/20 		1000 - 2000nm 15mm SF15
1 week
€470.50
Material SF15
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 1000 - 2000nm
A＝B＝C 15mm
Transmittance of P polarized light ＞94% (average with respect to wavelength.)
Reflectance of S polarized light ＞95% (average with respect to wavelength.)
Extinction ratio of transmission　(Ts:Tp) 1：300*
Availability Please contact
i
Broadband Polarizing Beamsplitter Cube 10mm 235 - 265nm
PBSW-10-250 		235 - 265nm 10mm Synthetic fused silica
6-12 weeks
€447.90
Material Synthetic fused silica
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 235 - 265nm
A＝B＝C 10mm
Transmittance of P polarized light ＞85%
Reflectance of S polarized light ＞90%
Extinction ratio of transmission　(Ts:Tp) 1：100
i
Broadband Polarizing Beamsplitter Cube 20mm 235 - 265nm
PBSW-20-250 		235 - 265nm 20mm Synthetic fused silica
6-12 weeks
€680.70
Material Synthetic fused silica
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 235 - 265nm
A＝B＝C 20mm
Transmittance of P polarized light ＞85%
Reflectance of S polarized light ＞90%
Extinction ratio of transmission　(Ts:Tp) 1：100
i
Broadband Polarizing Beamsplitter Cube 15mm 330 - 370nm
PBSW-15-350 		330 - 370nm 15mm Synthetic fused silica
6-12 weeks
€519.50
Material Synthetic fused silica
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 330 - 370nm
A＝B＝C 15mm
Transmittance of P polarized light ＞85%
Reflectance of S polarized light ＞95%
Extinction ratio of transmission　(Ts:Tp) 1：100
i
Broadband Polarizing Beamsplitter Cube 12.7mm 450 - 650nm
PBSW-12.7-550 		450 - 650nm 12.7mm BK7
1 week
€282.90
Material BK7
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 450 - 650nm
A＝B＝C 12.7mm
Transmittance of P polarized light ＞85%
Reflectance of S polarized light ＞85% (average with respect to wavelength.)
Extinction ratio of transmission　(Ts:Tp) 1：200
i
Broadband Polarizing Beamsplitter Cube 10mm 750 - 850nm
PBSW-10-800 		750 - 850nm 10mm BK7
6-12 weeks
€268.70
Material BK7
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 750 - 850nm
A＝B＝C 10mm
Transmittance of P polarized light ＞92%
Reflectance of S polarized light ＞97%
Extinction ratio of transmission　(Ts:Tp) 1：200
i
Broadband Polarizing Beamsplitter Cube 20mm 750 - 850nm
PBSW-20-800 		750 - 850nm 20mm BK7
1 week
€403.10
Material BK7
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 750 - 850nm
A＝B＝C 20mm
Transmittance of P polarized light ＞92%
Reflectance of S polarized light ＞97%
Extinction ratio of transmission　(Ts:Tp) 1：200
i
Broadband Polarizing Beamsplitter Cube 15mm 380 - 750nm
PBSW-15-3/7 		380 - 750nm 15mm SK2
6-12 weeks
€437.50
Material SK2
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 380 - 750nm
A＝B＝C 15mm
Transmittance of P polarized light ＞92% (average with respect to wavelength.)
Reflectance of S polarized light ＞95% (average with respect to wavelength.)
Extinction ratio of transmission　(Ts:Tp) 1:500*
Availability Please contact
i
Broadband Polarizing Beamsplitter Cube 12.7mm 450 - 1080nm
PBSW-12.7-4/10 		450 - 1080nm 12.7mm SF15
1 week
€377.10
Material SF15
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 450 - 1080nm
A＝B＝C 12.7mm
Transmittance of P polarized light ＞92% (average with respect to wavelength.)
Reflectance of S polarized light ＞95% (average with respect to wavelength.)
Extinction ratio of transmission　(Ts:Tp) 1:500*
Availability Please contact
i
Broadband Polarizing Beamsplitter Cube 10mm 1000 - 2000nm
PBSW-10-10/20 		1000 - 2000nm 10mm SF15
1 week
€403.10
Material SF15
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 1000 - 2000nm
A＝B＝C 10mm
Transmittance of P polarized light ＞94% (average with respect to wavelength.)
Reflectance of S polarized light ＞95% (average with respect to wavelength.)
Extinction ratio of transmission　(Ts:Tp) 1：300*
Availability Please contact
i
Broadband Polarizing Beamsplitter Cube 20mm 1000 - 2000nm
PBSW-20-10/20 		1000 - 2000nm 20mm SF15
6-12 weeks
€671.80
Material SF15
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 1000 - 2000nm
A＝B＝C 20mm
Transmittance of P polarized light ＞94% (average with respect to wavelength.)
Reflectance of S polarized light ＞95% (average with respect to wavelength.)
Extinction ratio of transmission　(Ts:Tp) 1：300*
Availability Please contact
i
Broadband Polarizing Beamsplitter Cube 12.7mm 235 - 265nm
PBSW-12.7-250 		235 - 265nm 12.7mm Synthetic fused silica
6-12 weeks
€471.40
Material Synthetic fused silica
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 235 - 265nm
A＝B＝C 12.7mm
Transmittance of P polarized light ＞85%
Reflectance of S polarized light ＞90%
Extinction ratio of transmission　(Ts:Tp) 1：100
i
Broadband Polarizing Beamsplitter Cube 10mm 330 - 370nm
PBSW-10-350 		330 - 370nm 10mm Synthetic fused silica
6-12 weeks
€447.90
Material Synthetic fused silica
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 330 - 370nm
A＝B＝C 10mm
Transmittance of P polarized light ＞85%
Reflectance of S polarized light ＞95%
Extinction ratio of transmission　(Ts:Tp) 1：100
i
Broadband Polarizing Beamsplitter Cube 20mm 330 - 370nm
PBSW-20-350 		330 - 370nm 20mm Synthetic fused silica
1 week
€680.70
Material Synthetic fused silica
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 330 - 370nm
A＝B＝C 20mm
Transmittance of P polarized light ＞85%
Reflectance of S polarized light ＞95%
Extinction ratio of transmission　(Ts:Tp) 1：100
i
Broadband Polarizing Beamsplitter Cube 15mm 450 - 650nm
PBSW-15-550 		450 - 650nm 15mm BK7
1 week
€304.50
Material BK7
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 450 - 650nm
A＝B＝C 15mm
Transmittance of P polarized light ＞85%
Reflectance of S polarized light ＞85% (average with respect to wavelength.)
Extinction ratio of transmission　(Ts:Tp) 1：200
i
Broadband Polarizing Beamsplitter Cube 12.7mm 750 - 850nm
PBSW-12.7-800 		750 - 850nm 12.7mm BK7
6-12 weeks
€282.90
Material BK7
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 750 - 850nm
A＝B＝C 12.7mm
Transmittance of P polarized light ＞92%
Reflectance of S polarized light ＞97%
Extinction ratio of transmission　(Ts:Tp) 1：200
i
Broadband Polarizing Beamsplitter Cube 10mm 380 - 750nm
PBSW-10-3/7 		380 - 750nm 10mm SK2
6-12 weeks
€358.30
Material SK2
Surface flatness of substrate λ/4
Angular deviation of transmitted beam ＜10′
Coating Hypotenuse surface ; Dielectric multilayer coating
Four surfaces ; Multilayer antireflection coating
Incident angle 0°
Laser Damage Threshold 0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality (Scratch-Dig) 20-10
Wavelength range 380 - 750nm
A＝B＝C 10mm
Transmittance of P polarized light ＞92% (average with respect to wavelength.)
Reflectance of S polarized light ＞95% (average with respect to wavelength.)
Extinction ratio of transmission　(Ts:Tp) 1:500*
Availability Please contact

You must be logged in to ask questions

◦Polarizing beamsplitters split the light entering at zero degrees into p-polarization as transmitted and s-polarization as reflected.
◦Four surfaces of the cube are coated with multi-layer anti-reflection coatings.
◦For cube beamsplitters, unlike plate beamsplitters, beam deviations of transmitted beams and ghosts rarely occur.

We detect that you are accessing the website from a different region. You will be redirected to a local version of OptoSigma.

Your requested the page :

EUROPE

Redirection to :