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  • Optical Attenuators

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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.

 

 

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

Strict angle limit

 

Double Brewster window

Relatively high LIDT

Large aperture

P-light and S-light are perpendicular to each other

Strict angle limit

 

Product

Number

Type

(t)

Control

(c)

Polarizer

(b)

Aperture

(a)

Power

(p)

Wavelength

(λ)

Housing

(h)

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

 

 

Product Number*

Clear Aperture 

Power

Wavelength

Response Time

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

COA-OM-B-a-p-λ-P03**

5-40mm

<10000W

1064, 532nm or other

/

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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