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Optical Attenuators
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Optical Attenuators
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  • 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.
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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

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

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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