Del Mar Photonics - Greyhawkoptics - Variable Attenuators for High Power Lasers

 

Variable Attenuators for High Power Lasers

Diffractive attenuators control the power of laser radiation using diffraction gratings. Since phase diffraction gratings do not absorb light they can be used for high-power laser radiation (cw, pulsed). Variation of grating parameters along the substrate results in variable transmission at a given wavelength.
Diffractive attenuators can be designed for wavelength from deep UV till IR for laser powers up to 250W/cm2 in CW and 1000mJ/cm2 in 10ns pulses.

Principle of operation

Light beam passing through a diffractive grating is partially deflected into several diffractive orders, which get subsequently blocked by diaphragm. Thus the zero order beam (does not change the direction of propagation) is attenuated. The intensity of output radiation Ioutput depends on the grating design and wavelength of input beam. By changing the grating parameters one can control the power of output radiation1. The transmission coefficient of such an attenuator is h = Ioutput/Iinput..

Design of diffractive attenuator on the base of circular diffractive grating.

Design of diffractive attenuator on the base of circular diffractive grating

Key features

Applications

 

Attenuator design

 

Specifications

 

Substrate material

- surface flatness

- wedge

- outside-, inside diameter

- thickness

- clear aperture

Design wavelength

Transmission range

Transmission function

Deviation from linearity of transmission

Polarization

Coating S1, S2

Damage threshold

Cleaning

UV grade fused silica

l/4 @ 532nm over clear aperture

<20 arcsec

60 mm, 8mm

4 mm

10 mm

532nm, 1064nm (others wavelengths on request)

T = 0.01 (0.025) 0.95 5% over 340o

linear (approximated by stair case with 20 steps)

<5%

Transmission not dependent on polarization

Broadband antireflection coating, R532/1064<0.3%

250 W/cm2 -CW, 1000 mJ/cm2 with 10ns pulses

Non-abrasive method, acetone or isopropyl alcohol

Diffractive attenuator with mount

 

 

 

Laser Attenuators
 
Let's See What We Have Here Diffractive attenuators control the power of laser radiation using diffraction gratings. Since phase diffraction gratings do not absorb light they can be used for high-power laser radiation (CW, pulsed). Variation of grating parameters along the substrate results in variable transmission at a given wavelength.
Diffractive Variable Attenuators are based on binary optics technology. Attenuator manufacturing starts from computer design of two-dimensional diffractive gratings using proprietary Diffraction Optics Design Software. Master Grating mask is created using high-resolution laser photo plotters. Final manufacturing process is accomplished using lithographic methods including plasma etching.
Diffractive attenuators are designed for wavelength from deep UV till IR. Damage threshold for these high power attenuators is more than 250W/cm2 in CW and 1000 mJ/cm2 in 10ns pulses.
Lead time 1-2 weeks
 Model   Product Name+   Price   Buy Now 
 DVA-532   Diffractive Variable Attenuator, 532 nm   $3,200.00  Buy Now 
 DVA-800   Diffractive Variable Attenuator, 800 nm   $3,200.00  Buy Now 
 DVA-1064   Diffractive Variable Attenuator, 1064 nm   $3,200.00  Buy Now 
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