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Optical Attenuators
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Product description：
Optical attenuator is an optical component which can be used to continuously change the output power of laser. It consists of half-wave plate (or electro-optic crystal) and polarizer. The polarization state of incident light is modulated by the half-wave plate (or electro-optic crystal) therefore vary the degree of attenuation at the polarizer which divides the light further into two beams at specified ratio. Optical attenuator is widely employed in various fields such as the precision laser processing, laser detection, sensing and others. In particular, it has unique advantages in application of ultra-fast and ultra-short pulse laser systems.
CASTECH provides two different types attenuator according to the modulation methods.
The wave plate modulation is to modify the polarization state of light passing through the polarizer by rotating the half-wave plate. It features in compact structure and strong adaptability.
The electro-optic modulation could approach maximum modulating speed of nanoseconds consequently be used as high speed light switches.
The polarizer is selective as PBS cube or Brewster window. In addition, both electronic and manual control are available. Other spare parts like optical traps could be integrated also at will.
Applications：
● Laser industrial processing
● Laser sensing system
● Ultrafast laser system
| Optical attenuator is an optical component that can change the output power of laser continuously. It is consisted of half-wave plate (or electro-optic crystal) and polarizer. The polarization state of incident light is modulated by the half-wave plate (or electro-optic crystal) therefore vary the degree of attenuation at the polarizer which divides the light further into two beams at a specific ratio. Optical attenuators are ideal for the application 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 modulation principles: wave plate modulation and electro-optic modulation types. Wave plate modulation modifies the polarization state of light by rotating the half-wave plate. It features in compact structure and strong adaptability. Electro-optic modulation can be used as high speed optical switches which can accomplish a modulation in nanoseconds. PBS and Brewster window are available for the polarizer part. Electronic or manual control are optional. Accessories such as optical traps could be ordered separately. |
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Diagram of Optical Path |
Polarizer Type |
Advantage |
Disadvantage |
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PBS |
High extinction ratio P-light and S-light are perpendicular to each other |
Limited aperture Relatively low laser damage threshold |
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Single Brewster window |
Relatively high LIDT Large aperture |
P-light and S-light have a certain angle Strict angle limit |
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Double Brewster window |
Relatively high LIDT Large aperture P-light and S-light are perpendicular to each other |
Strict angle limit |
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Product Number |
Type (t) |
Control (c) |
Polarizer (b) |
Aperture (a) |
Power (p) |
Wavelength (λ) |
Housing (h) |
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COA-tc-B-a-p-λ-h |
O (Optical) E (Electro-Optic) |
A (Automatic) M (Manual) |
B (Brewster) |
5,10,20,40mm... |
≤10000W |
266nm 355nm 515nm 532nm 800nm 1030nm 1064nm 1550nm ... |
P01 P02 ... |
|
COA-tc-P-a-p-λ-h |
P (PBS) |
5,10,12,25.4mm... |
≤200W |
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Product Number* |
Clear Aperture |
Power |
Wavelength |
Response Time |
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COA-OM-P-a-p-λ-P01** |
5-20mm |
<200W |
1064, 532nm or other |
/ |
|
COA-OA-P-a-p-λ-P02** |
5-20mm |
<200W |
1064, 532nm or other |
ms |
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COA-OM-B-a-p-λ-P03** |
5-40mm |
<10000W |
1064, 532nm or other |
/ |
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COA-EA-P-a-p-λ-P04*** |
5-20mm |
<100W |
1064, 532nm or other |
ns-ms |
*Customized products are available.
**Damage threshold: 10 J/cm? @ 1064 nm, 10 ns, 10 Hz
***Damage threshold: 1 J/cm? @ 1064 nm, 10 ns, 10 Hz
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