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Right-Angle Prisms

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Grouped product items
SKU Specifications Stock Qty Price Add to cart
9003050
NEW
90˚ angle tolerance, arcsec: ±2
Coatings: AR (R < 0.3%) @ 1535 nm
Dimensions, mm: 5 x 5 x 7.1 (±0.2)
Durability: per MIL-M-13508C
Edge chips, μm: < 5
LIDT: > 1 GW/cm² @ 1535 nm, 10 ns pulse, repetition rate 1 Hz
Material: BK7
Part No: 3730 828 1
Pyramidal tolerance, arcmin: <1
Protective chamfers: <0.25 mm x 45° on all edges except roof edge
Reflected WFD, fringes: 0.05 (RMS) and 0.2 (P-V) @ 633 nm
Surface flatness, fringes: <1/4 on all faces
Surface quality: 20-10 S-D
25
€7.00
9324582
90° angle tolerance: ±2 arcmin
Clear aperture: >80
Coatings: AR@1030
Dimensions A x B x C, mm: 30 x 30 x 30
Dimensions tolerance, mm: +0/-0.2
S1 Flatness, PV IR S2 Flatness, PV: <λ/4 @ 632.8 nm
Material: BK7
Pyramidal tolerance: <1 arcmin
Protective chamfers: <0.25 mm x 45°
Surface quality, S-D: 40-20
1
€95.00
9325032
90° angle tolerance: ±2 arcmin
Clear aperture: >80
Coatings: AR@1030
Dimensions A x B x C, mm: 30 x 30 x 30
Dimensions tolerance, mm: +0/-0.2
S1 Flatness, PV IR S2 Flatness, PV: <λ/4 @ 632.8 nm
Material: BK7
Pyramidal tolerance: <1 arcmin
Protective chamfers: <0.25 mm x 45°
Surface quality, S-D: 40-20
2
€150.00
9327032
90° angle tolerance: ±2 arcmin
Clear aperture: >80
Coatings: uncoated
Dimensions A x B x C, mm: 50.8 x 50.8 x 50.8
Dimensions tolerance, mm: +0/-0.2
S1 Flatness, PV IR S2 Flatness, PV: <λ/4 @ 632.8 nm
Material: BK7
Pyramidal tolerance: <1 arcmin
Protective chamfers: <0.25 mm x 45°
Surface quality, S-D: 40-20
1
€150.00
9328882
90° angle tolerance: ±2 arcmin
Clear aperture: >80
Coatings: AR@313
Dimensions A x B x C, mm: 12.7 x 12.7 x 12.7
Dimensions tolerance, mm: +0/-0.2
S1 Flatness, PV IR S2 Flatness, PV: <λ/4 @ 632.8 nm
Material: UVFS
Pyramidal tolerance: <1 arcmin
Protective chamfers: <0.25 mm x 45°
Surface quality, S-D: 40-20
1
€110.00
9330183
90° angle tolerance: ±2 arcmin
Clear aperture: >80
Coatings: BBAR@700-900
Dimensions A x B x C, mm: 28.2 x 28.2 x 175
Dimensions tolerance, mm: +0/-0.2
S1 Flatness, PV IR S2 Flatness, PV: <λ/4 @ 632.8 nm
Material: BK7
Pyramidal tolerance: <1 arcmin
Protective chamfers: <0.25 mm x 45°
Surface quality, S-D: 60-40
1
€388.00
9337023
90° angle tolerance: ±3 arcmin
Clear aperture: >80
Coatings: uncoated
Dimensions A x B x C, mm: 10 x 15
Dimensions tolerance, mm: +0/-0.2
S1 Flatness, PV IR S2 Flatness, PV: <λ/4 @ 632.8 nm
Material: BK7
Pyramidal tolerance: <1 arcmin
Protective chamfers: <0.25 mm x 45°
Surface quality, S-D: 40-20
2
€90.00
9352845
90° angle tolerance: ±2 arcmin
Clear aperture: >80
Coatings: uncoated
Dimensions A x B x C, mm: 25 x 25 x 25
Dimensions tolerance, mm: +0/-0.2
S1 Flatness, PV IR S2 Flatness, PV: <λ/4 @ 632.8 nm
Material: BK7
Pyramidal tolerance: ±1 arcmin
Surface quality, S-D: 40-20
1
€113.00
9352985
90° angle tolerance: ±2 arcmin
Clear aperture: >80
Coatings: Silver+SiO2 coated
Dimensions A x B x C, mm: 20 x 20 x 20
Dimensions tolerance, mm: +0/-0.2
S1 Flatness, PV IR S2 Flatness, PV: <λ/4 @ 632.8 nm
Material: BK7
Pyramidal tolerance: <1 arcmin
Protective chamfers: <0.25 mm x 45°
Surface quality, S-D: 40-20
1
€90.00
9376767
90° angle tolerance: ±2 arcmin
Clear aperture: >80
Coatings: uncoated
Comments: Suprasil ULV
Dimensions A x B x C, mm: 10 x 10 x 10
Dimensions tolerance, mm: +0/-0.2
S1 Flatness, PV IR S2 Flatness, PV: <λ/4 @ 632.8 nm
Material: UVFS
Pyramidal tolerance: <1 arcmin
Protective chamfers: <0.25 mm x 45°
Surface quality, S-D: 40-20
2
€110.00
9428512
90° angle tolerance: ±2 arcsec
Clear aperture: >80
Coatings: AR(R<0.3%)@1535 nm
Dimensions A x B x C, mm: 5 x 5 x 5
Dimensions tolerance, mm: ±0.2
Material: BK7
Pyramidal tolerance: <1 arcmin
Surface quality, S-D: 20-10
2
€14.00
9391489
90° angle tolerance: ±10 arcsec
Clear aperture: >80
Coatings: uncoated
Dimensions A x B x C, mm: 10 x 10 x 10
Dimensions tolerance, mm: +0/-0.2
S1 Flatness, PV IR S2 Flatness, PV: <λ/4 @ 632.8 nm
Material: UVFS
Pyramidal tolerance: <1 arcmin
Surface quality, S-D: 40-20
3
€32.00
9410691
Material: BK7
Surface quality, S-D: 40-20
Protective chamfers: 0.1-0.25 mm x 45°
Pyramidal tolerance: ±1 arcmin
S1 Flatness, PV IR S2 Flatness, PV: <λ/4 @ 632.8 nm
Dimensions A x B x C, mm: 25.4 x 25.4 x 25.4 (+0/-0.2)
Coatings: uncoated
Clear Aperture: >80
90° angle tolerance: ±2 arcmin
11
€38.00
9416641
90° angle tolerance: ±2 arcmin
Clear aperture: >80
Coatings: uncoated
Dimensions A x B x C, mm: 25.39 x 25.14 x 25.08
Dimensions tolerance, mm: +0/-0.2
S1 Flatness, PV IR S2 Flatness, PV: <λ/4 @ 632.8 nm
Material: BK7
Pyramidal tolerance: <1 arcmin
Protective chamfers: <0.25 mm x 45°
Surface quality, S-D: 40-20
2
€32.00
9419051
NEW
Coatings: S1: AR(R<0.1%)@1000-1060nm, AOI 0-20 deg
Comments: S2. S3: uncoated. polished.
Dimensions A x B x C, mm: 16x8x4
S1 Flatness, PV IR S2 Flatness, PV: <λ/10 in CA.
Material: UVFS C7980 0A
Surface quality, S-D: 20-5
10
€30.00
9420582
90° angle tolerance: ±2 arcmin
Clear aperture: >80
Coatings: S1: Enhanced Aluminum.R>95%@450-650nm
Dimensions A x B x C, mm: 40 x 40 x 56.6
S1 Flatness, PV IR S2 Flatness, PV: <λ/10 @ 632.8 nm
Material: N-BK7
Pyramidal tolerance: <1 arcmin
Surface quality, S-D: 40-20
3
€80.00
9420592
90° angle tolerance: ±2 arcmin
Clear aperture: >80
Coatings: S1: Enhanced Aluminum.R>95%@450-650nm
Dimensions A x B x C, mm: 30 x 30 x 42.4
Dimensions tolerance, mm: (+0/-0.1)
S1 Flatness, PV IR S2 Flatness, PV: <λ/8 @ 632.8 nm
Material: N-BK7
Pyramidal tolerance: <1 arcmin
Surface quality, S-D: 40-20
2
€60.00
9421252
90° angle tolerance: ±2 arcmin
Clear aperture: >80
Coatings: uncoated
Dimensions A x B x C, mm: 20 x 20 x 20
Dimensions tolerance, mm: +0/-0.2
S1 Flatness, PV IR S2 Flatness, PV: <λ/4 @ 632.8 nm
Material: BK7
Pyramidal tolerance: <9.5 arcmin
Protective chamfers: <0.25 mm x 45°
Surface quality, S-D: 40-20
2
€33.00
9421572
Clear aperture: >80
Coatings: uncoated
Dimensions A x B x C, mm: 12.7 x 12.7 x 12.7
S1 Flatness, PV IR S2 Flatness, PV: <λ/4 @ 632.8 nm
Material: BK7
Surface quality, S-D: 40-20
5
€23.00
9423652
Clear aperture: >80
Coatings: uncoated
Dimensions A x B x C, mm: 25.4 x 25.4 x 25.4
S1 Flatness, PV IR S2 Flatness, PV: <λ/4 @ 632.8 nm
Material: N-BK7
Surface quality, S-D: 20-10
1
€32.00
9426902
90° angle tolerance: ±2 arcmin
Clear aperture: >80
Coatings: uncoated
Dimensions A x B x C, mm: 25.4 x 25.4 x 25.4
Dimensions tolerance, mm: +0/-0.2
S1 Flatness, PV IR S2 Flatness, PV: <λ/4 @ 632.8 nm
Material: BK7
Pyramidal tolerance: <1 arcmin
Protective chamfers: <0.25 mm x 45°
Surface quality, S-D: 40-20
2
€32.00
9428762
Protective chamfers: 0.1-0.25 mm x 45°
Surface quality, S-D: 40-20
Pyramidal tolerance: ±30arcsec
Material: UVFS
Dimensions A x B x C, mm: 12.7 x 12.7 x 12.7 (+0/-0.2)
Coatings: uncoated
Clear Aperture: >80
S1 Flatness, PV IR S2 Flatness, PV: <λ/4 @ 632.8 nm
1
€62.00
9428772
90° angle tolerance: ±2 arcmin
Clear aperture: >80
Coatings: uncoated
Dimensions A x B x C, mm: 12.7 x 12.7 x 12.7
Dimensions tolerance, mm: +0/-0.2
S1 Flatness, PV IR S2 Flatness, PV: <λ/4 @ 632.8 nm
Material: UVFS
Pyramidal tolerance: <1 arcmin
Protective chamfers: <0.25 mm x 45°
Surface quality, S-D: 40-20
1
€52.00
9433823
90° angle tolerance: ±2 arcmin
Clear aperture: >80
Coatings: uncoated
Dimensions A x B x C, mm: 10 x 10 x 10
Dimensions tolerance, mm: +0/-0.2
S1 Flatness, PV IR S2 Flatness, PV: <λ/4 @ 632.8 nm
Material: UVFS
Pyramidal tolerance: <1 arcmin
Protective chamfers: <0.25 mm x 45°
Surface quality, S-D: 60-40
3
€32.00
9500030
NEW
LIDT: >1 GW/cm² @ 1064 nm, 10 ns, 20 Hz
WFD (reflected): <0.05 RMS, <0.2 PTV
Surface qualtity: 20 - 10 S-D
S1 Flatness, PV IR S2 Flatness, PV: λ/10 @ 632.8 nm
Pyramidal error: < 30 arcsec
Material: optical grade fused silica
Diameter, mm: Ø10.0 (+0.0/-0.022)
Coatings: AR (R<0.25%) @ 1064 nm
Clear aperture: Ø9 mm
Chips: < 5 μm (on knife edge)
Protective chamfers: 0.2 mm x 45°
Angle tolerance: ± 2 arcsec
Durability: per MIL-M13508 C
16
€135.00
9513431
90° angle tolerance: ±2 arcmin
Clear Aperture: >80
Coatings: uncoated
Dimensions A x B x C, mm: 20.0 x 20.0 x 20.0 (+0/-0.2)
S1 Flatness, PV IR S2 Flatness, PV: <λ/4 @ 632.8 nm
Material: BK7
Pyramidal tolerance: ±1 arcmin
Protective chamfers: 0.1-0.25 mm x 45°
Surface quality, S-D: 40-20
1
€31.00
9515491
Perpendicularity error: ±30 arcsec
Coatings:
Surface quality, S2/S3: 5/ 3 x 0.1; L1 x 0.02; E0.2
Surface quality, hypotenuse S1: 5/ 3 x 0.2; L1 x 0.04; E0.2
Surface flatness (RMS), S1/S2/S3: <0.5 nm
Surface flatness (PV), S1/S2/S3: 3/ (0.2) λ=632.8 nm
S1 (hypotenuse) IBS: R<0.1%@ 1030 nm (±2 nm), R<0.15%@ 1030 nm, (±5 nm), AOI=0°
Protective chamfers: 1 mm x 45°
LIDT: 6/ >500 mJ/cm², 1030 nm, 500 fs, <5 MHz
45 deg angle tolerance: ±30 arcsec
Clear aperture of hypotenuse: 31.36 mm x 58 mm
90 deg angle tolerance: ±3 arcsec
Dimensions A x B x C, mm: A 24.8 mm x B 24.8 mm x H 65 mm (+/-0.1 mm)
Material: Suprasil 3001
1
€1,184.00
9515521
Material: Suprasil 3001
Surface quality, S2/S3: 5/ 3 x 0.1; L1 x 0.02; E0.2
Surface quality, hypotenuse S1: 5/ 3 x 0.2; L1 x 0.04; E0.2
Surface flatness (RMS), S1/S2/S3: <0.5 nm
Surface flatness (PV), S1/S2/S3: 3/ (0.2) λ=632.8 nm
S1 (hypotenuse) IBS: R<0.1%@ 1030 nm (±2 nm), R<0.15%@ 1030 nm, (±5 nm), AOI=0°
Perpendicularity error: ±30 arcsec
Dimensions A x B x C, mm: A 41.49 mm x B 41.49 mm x H 25 mm (+/-0.1 mm)
Coatings:
Clear aperture of hypotenuse: 56 mm x 21 mm
90 deg angle tolerance: ±3 arcsec
45 deg angle tolerance: ±30 arcsec
LIDT: 6/ >500 mJ/cm², 1030 nm, 500 fs, <5 MHz
Protective chamfers: 1 mm x 45°
1
€1,598.00
9530223
90 deg tolerance: ±2 arcmin
Clear Aperture: >90%
Dimenssions, mm: 21 x 21 x 21 (+0/-0.2 mm)
Material: N-SF66 equivalent
Pyramidal error: ±2 arcmin
S1 Flatness, PV IR S2 Flatness, PV: λ/4 @ 633 nm per inch
Surface Quality: 40-20 S-D
5
€100.00
9564766
3 sides polished flatness: 3/0.25(0.1) ; 5/1x0.1 --> L/5
90° angle tolerance: ±2 arcmin
Clear Aperture: >90
Coatings: uncoated
Dimensions A x L, mm: 12 x 12 (+0/-0.1)
Material: N-BK7
Perpendicularity: ±1 arcmin
Pyramidal tolerance: for 90° ±1 arcmin; for 45° ±1 arcmin
Protective chamfers: <0.1 mm x 45°
2
€25.00
9574167
90° angle tolerance: +/-5 arcmin
Clear aperture: >90%
Dimensions, mm: 10 x 10 x 10 (+0/-0.2)
Material: BK7
Protective chamfers: <0.25mm x 45°
S1 Flatness, PV IR S2 Flatness, PV: λ/4 @ 632.8nm
Surface quality, S-D: 60-40
5
€16.00
9574827
NEW
Pyramidal tolerance: ±1 arcmin
Beam Deviation: <5arcmin
Surface quality, S-D ( 3surface polished as per drawing: LS171): <40-20
Protective chamfers: <0.25 mm x 45°
S1 Flatness, PV IR S2 Flatness, PV: <λ/10 @ 632.8 nm
Clear Aperture: >90%
Dimensions A x B x C, mm: 12.7 x 12.7 x 12.7 (+0/-0.2)
Material: N-BK7
3
€30.00
9577547
NEW
3
€59.00
9581088
NEW
Angle tolerance: <1arcmin;
Dimensions A x B x C, mm: 30x50 +/-0.1mm
Dimensions A x B x C, mm: 5.0x8.7 +/-0.1mm
General specifications for the substrate:
General specifications of the prism:
Item code: PAAFB-G
NOA61 glue used for securing prism (no glue between prism and susbstrate): glue trace on the window <0.4mm.
Parallelism error: <1arcmin;
Polishing: 20-10 S-D;
Polishing: 60-40 S-D;
Prism and substrate material: BK7 (H-K9L)
Prism and substrate: optically contacted (assembly adhesive free);
Protective chamfers: minimal;
Thickness, mm: 1.1 +/- 0.1mm
Thickness, mm: 5 +/- 0.1mm
Transmitted wavefront distortion, PV: L/8 @ 633nm;
7
€30.00
9588308
90 deg angle tolerance: +/- 1 arcmin
Clear aperture: >80 %
Coatings on hypotenuse: Aluminium coating
Dimensions A x B x C, mm: 12.7 x 12.7 x 12.7 mm (+0/-0.2 mm)
Material: BK7
Pyramidal tolerance: +/- 1 arcmin
Protective chamfers: 0.2-0.3 mm x 45 deg
Surface flatness, S1/S2/S3: Surface quality, S1/S2/S3: 40-20 S-D
6
€18.00
9607230
NEW
Pyramidal tolerance: +/- 2arcmin
Clear aperture: >90
Surface quality, S-D: 60-40
Protective chamfers: <0.25 mm x 45°
Material: N-SF66 or equivalent
S1 Flatness, PV IR S2 Flatness, PV: <λ @ 632.8 nm
Dimensions tolerance, mm: +0/-0.2
Dimensions A x B x C, mm: 21 x 21 x 21
Coatings: uncoated
90° angle tolerance: ±2 arcmin
Corner bevel: 0.6mmx45degx4
43
€30.00
9627592
NEW
Hole diameter, 1: 5.5 mm (+/-0.1 mm)
Other sides: uncoated
Surface quality, S0: 40/20 S/D
Surface quality, all other sides: commercially polished
Surface flatness, P-V, S0: λ/2@633 nm
Surface flatness, P-V, all other sides: n/a
S0: HR(Rs,p>99.8%)@940 nm - 980 nm + HR(Rsp>50%)@633 nm, AOI=45°
Protective chamfers, near S0: protective chamfer, chips <0.1 mm.
Protective chamfers, all other sides: <0.25 mm x 45°
Clear aperture: 100%
Hole position tolerance: +/- 0.3 mm)
Angle of prism: 45° (+/- 30 arcsec)
Material: UVFS (JGS1)
Coatings: MS
Dimensions, mm: 27.0 mm x 10.86 mm x 22.02 mm x 17.78 mm (+/-0.1 mm)
Hole diameter, 2: 4.0 mm (+/-0.1 mm)
Item: 00007624
3
€1,450.00
9627602
NEW
Surface flatness, P-V, S0: λ/2@633 nm
Material: UVFS (JGS1)
Surface flatness, P-V, all other sides: n/a
S0: HR(Rs,p>99.8%)@940 nm - 980 nm + HR(Rsp>50%)@633 nm, AOI=45°
Protective chamfers, near S0: protective chamfer, chips <0.1 mm.
Protective chamfers, all other sides: <0.25 mm x 45°
Other sides: uncoated
Surface quality, all other sides: commercially polished
Hole position tolerance: +/- 0.3 mm)
Hole diameter, 2: 4.0 mm (+/-0.1 mm)
Hole diameter, 1: 5.5 mm (+/-0.1 mm)
Dimensions, mm: 27.0 mm x 10.86 mm x 22.02 mm x 17.78 mm (+/-0.1 mm)
Coatings: MS
Angle of prism: 45° (+/- 30 arcsec)
Clear aperture: 100%
Item: 00007625
Surface quality, S0: 40/20 S/D
3
€1,450.00
9630663
NEW
Part Number: 10150637
Surface quality S1/S2/S3: 3x0.2; L3x0.01; R0.5
Right angle tolerance, arcmin: <3
Pyramidal error, arcmin: <5
Material: H-K9L
LIDT: 100 shots @500MW/cm2@1064nm to be verified on sample basis on an actual component
FLatnes S1/S2/S3 @632.8nm: L/10
Part Name: TX prism
Double pas WFD @632.8: Coatings S1/S2: AR(R<0.2)@1540 nm
Dimensions, mm: 8x8x8 +/-0.1
5
€30.00
9638423
NEW
Dimensions, mm: 8x8x8 +/-0.1
Surface quality S1/S2/S3: 3x0.2; L3x0.01; R0.5
Right angle tolerance, arcmin: <3
Pyramidal error, arcmin: <5
Material: H-K9L
Double pas WFD @632.8: Coatings S1/S2: Uncoated
FLatnes S1/S2/S3 @632.8nm: L/10
55
€30.00
9638893
NEW
Surface quality: 40-20 S-D 3 sides polished
Dimensions A x B x C, mm: 15 x 15 x15 mm (+0/-0.05 mm)
S1 Flatness, PV IR S2 Flatness, PV: BETTER THAN LAMBA/4 AT 632.8NM
Clear aperture: >15x13 mm (legs), >19x15 mm (hypotenuse)
Material: Schott N-Lasf31A
12
€30.00
9655235
NEW
Material: H-K9L glass
Surface quality: 60-40
S1 Flatness, PV IR S2 Flatness, PV: L/4 @633nm
5
€330.00
9675267
NEW
Reflection wavefront distortion: side A < λ/6 @ 632.8 nm
Side A: -
Transmission wavefront distortion: side B < λ/6 @ 632.8 nm
Side B: AR (R<0.1%) @ 1064 nm, AOI= 0 deg
LIDT: >10 J/cm2 10ns 10HZ 1064nm
Clear aperture: as per drawing
Dimensions, mm: as per drawing
Material: BK7
Coatings:
Surface quality (side A, B): 20-10
1
€30.00
9704810
NEW
Chips: <0.2 mm
Pyramidal tolerance: +/-1 arcmin
Protective chamfers: 0.1-0.2 mm x 45 deg
Polished apertures: 56 mm x 5 mm (B x H and A x H) sides polished with 60-40 S-D
90 deg angle tolerance: +/-30 arcsec
Material: H-K9L
Dimensions, mm: A 56 mm (+0/-0.1 mm) x B 56 (+0/-0.1 mm) mm x H 5 mm (+/-0.1 mm)
6
€30.00
9747974
NEW
Dimensions A x B x C, mm: 20.0 x 20.0 x 20.0 (+0/-0.2)
Surface quality, S-D: 40-20
Pyramidal tolerance: ±1 arcmin
Protective chamfers: 0.1-0.25 mm x 45°
Material: UVFS
Dimensions tolerance, mm: +0/-0.2
Coatings: AR@1030 on hypotenuse
Clear Aperture: >80
90° angle tolerance: ±2 arcmin
S1 Flatness, PV IR S2 Flatness, PV: <λ/4 @ 632.8 nm
5
€30.00
9762646
NEW
Material: YAG
Surfaces, S-D: 10-5 (polished for high LIDT before coating)
S1, S2: AR<0,25%@ 1060-1070 i0-25+AR<2%@ 1060-1070 i25-40+AR<2%@ 780-820 i0-25+AR<2%@ 900-1450 i0-25
Dimensions, mm: 10x10x10 mm;
Dimensions tolerance, mm: +0/‐0.1
Coatings:
S3: HRsp>98.5% @1064 (AOI=45°) + HRsp>74% @790-820 (AOI=0-25°) + AR<4.5% @1064 (AOI=0-10°)
1
€30.00
9772437
NEW
Coatings:
Dimensions tolerance, mm: +0/‐0.1
Dimensions, mm: 10x10x10 mm;
Material: YAG
S1, S2: AR<0,25%@ 1060-1070 i0-25+AR<2%@ 1060-1070 i25-40+AR<2%@ 780-820 i0-25+AR<2%@ 900-1450 i0-25
S3: HRsp>98.5% @1064 (AOI=45°) + HRsp>74% @790-820 (AOI=0-25°) + AR<4.5% @1064 (AOI=0-10°)
Surfaces, S-D: 10-5 (polished for high LIDT before coating)
2
€30.00
9807790
NEW
Material: H-K9L
Perperdicularity: <3 arcmin
Surface quality: 60-40
5
€30.00
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Right-Angle prisms are often preferable to an inclined mirror in applications involving severe acoustic or inertial loads, because they are easier to mount, and deform much less than mirror in response to external mechanical stress. As long as acceptance angle limitations for TIR from the roof faces are not exceeded, the right angle prisms can serve as a retro reflector, turning beams back to the original direction. 

  • Can work as internal or external reflectors or as retroreflectors

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