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Optical Attenuators
Product description：
Optical attenuator is an optical component that can change the output power of laser continuously. It is consisted of a half-wave plate (or an electro-optic crystal) and a polarizer. The polarization state of incident light is modulated by the half-wave plate (or electro-optic crystal) therefore to vary the degree of attenuation. The polarizer can divide the light further into two beams at a specific ratio. Optical attenuators are ideal for the applications in precision laser processing, laser detection, laser sensing etc., especially in ultra-fast and ultra-short pulse laser systems.
CASTECH provides two types of attenuators according to different modulating principles：mechanical and electro-optical type.
Mechanical attenuator modifies the polarization state of light by rotating the half-wave plate. It is characterized by compact structure and adaptability.
Electro-optical attenuator can be used as a high-speed optical switch which can accomplish a modulation in nanoseconds. CASTECH's optical attenuator has two control schemes, electric and manual. Attenuator can be equipped with PBS, Brewster window, or removable optical trap as optional accessaries.
Applications：
● Industrial processing
● Laser industrial processing
● Laser sensing system
● Ultrafast laser system
|
Diagram of Optical Path |
Polarizer Type |
Advantage |
Disadvantage |
|
|
PBS |
●High extinction ratio ●P-light and S-light are perpendicular to each other |
●Limited aperture ●Relatively low laser damage threshold |
|
|
Single Brewster window |
●Relatively high LIDT ●Large aperture |
●P-light and S-light have a certain angle between ●Strict angle limit |
|
|
Double Brewster windows |
●Relatively high LIDT ●Large aperture ●P-light and S-light are perpendicular to each other |
●Strict angle limit |
Products
-
Optical Attenuators
- Optical attenuator is an optical component that can change the output power of laser continuously. CASTECH provides two types of attenuators: mechanical and electro-optical type.
-
Product description：
Optical attenuator is an optical component that can change the output power of laser continuously. It is consisted of a half-wave plate (or an electro-optic crystal) and a polarizer. The polarization state of incident light is modulated by the half-wave plate (or electro-optic crystal) therefore to vary the degree of attenuation. The polarizer can divide the light further into two beams at a specific ratio. Optical attenuators are ideal for the applications in precision laser processing, laser detection, laser sensing etc., especially in ultra-fast and ultra-short pulse laser systems.
CASTECH provides two types of attenuators according to different modulating principles：mechanical and electro-optical type.
Mechanical attenuator modifies the polarization state of light by rotating the half-wave plate. It is characterized by compact structure and adaptability.
Electro-optical attenuator can be used as a high-speed optical switch which can accomplish a modulation in nanoseconds. CASTECH's optical attenuator has two control schemes, electric and manual. Attenuator can be equipped with PBS, Brewster window, or removable optical trap as optional accessaries.
Applications：
● Industrial processing
● Laser industrial processing
● Laser sensing system
● Ultrafast laser system
|
Diagram of Optical Path |
Polarizer Type |
Advantage |
Disadvantage |
|
|
PBS |
●High extinction ratio ●P-light and S-light are perpendicular to each other |
●Limited aperture ●Relatively low laser damage threshold |
|
|
Single Brewster window |
●Relatively high LIDT ●Large aperture |
●P-light and S-light have a certain angle between ●Strict angle limit |
|
|
Double Brewster windows |
●Relatively high LIDT ●Large aperture ●P-light and S-light are perpendicular to each other |
●Strict angle limit |
|
Mechanical Attenuators Model Number：COA-Oc-b-a-p-λ-h |
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|
Control mode(c) |
Polarizer(b) |
Aperture(a) |
Power(p) |
Wavelength(λ) |
Housing (h) |
|
A (automatic) M (manual) |
B (Brewster window) P (PBS) |
5 mm 10 mm 12 mm 20 mm 40 mm ... |
100 (≤100 W) 200 (≤200 W) 1000* (≤1000 W)
|
266 nm 355 nm 515 nm 532 nm 800 nm 1030 nm 1064 nm 1550 nm ... |
P01 P02 ... |
|
Electro-Optical Attenuators Model Number：COA-Ec-b-a-p-λ-h |
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|
Control mode(c) |
Polarizer(b) |
Aperture(a) |
Power(p) |
Wavelength(λ) |
Housing (h) |
|
A (automatic) |
B (Brewster window) P (PBS) |
5 mm 10 mm 12 mm 20 mm ... |
100 (≤100 W) 200 (≤200 W)
|
266 nm 355 nm 515 nm 532 nm 800 nm 1030 nm 1064 nm 1550 nm ... |
P04 ... |
*Only suitable for Brewster window polarizer type products
|
Typical Specifications |
||||
|
Type |
Aperture |
LIDT |
Wavelength |
Response time |
|
Mechanical |
20 mm |
10 J/cm² 10 ns,10 Hz |
1064 nm |
ms |
|
Electro-optical |
10 mm |
3 J/cm² 10 ns,10 Hz |
532 nm |
ns |
Housing dimensions(mm)：
P02 P04
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