From now on, Nanoptic Inc. can furnish DOEs. Below is information of DOEs.

 
 
 
 
 
Motorizedattenuator Non-Motorizedattenuator
Diffractive attenuators of filters of variable density are intended to control the power of laser radiation in the range from deep UV to IR. Small absorption of light power by the phase diffractive attenuators allows to control the pulse and continuous high-power laser radiation.
 
 

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 radiation. The transmission coefficient of such an attenuator is η= Ioutput/Iinput.
 

Applications

Beam-modulators for high power lasers (Nd:YAG-, Argon-, Excimer-...)
for material processing (e.g. marking), scanner systems, etc.
Beam-splitters with adjustable splitting coefficient and attenator.
 
   
 
Amplitude attenuator (chromium pattern)
- Laser writing
Phase attenuator (relief pattern)
- Ion etching
   
 
Specifications of attenuators
 
Diffractive attenuator
( Non-Motorized / Motorized attenuator )
Damage threshold : 2-3J/㎠ at 10ns
Spectral range : 240-355nm , 532nm
Spacing of grating grooves : 2mm
Diameter of round cells : from 0.3 to 1.6mm
Depth of relief : 330 ~ 350nm
Wavefront distortion : smaller than λ/4
Laser beam size : smaller than 25mm
Overall size : about ø 102mm
Dynamic range : 50-100
Casing dimensions : about 120x120x100mm
(w/o external absorber)


System( Motorized attenuator )
Housing : Aluminum
Communication interface : USB v1.0 or 1.1
Radiator : Extern
Power supply : Extern +12V
Supply current : 1A (max)
Attenuator control
Resolution : 1deg.
Full scale changing time : 6s
User control
Manual Control : 7 Keys
Display : LCD
Sortware
Driver : Windows 2000, XP
DLL : C standard for Lab View
Lab view example
 
Nanoptic, Inc. now provides VIS-IR and UV, DUV diffractive attenuator on the market.
For more information, please feel free to contact Nanoptic, inc.
 
 
 
 
 
Laser optics:
A single DOE can be used in place of three or four conventional lenses for the task of collimating or focusing laser beams.

Diffractive prototyping:
Fabrication of high quality diffractive optics prototypes, different kinds of masks for your projects.

Microlens arrays:
Spot array generators, controlled angle diffusers, microlens array imaging systems, confocal microscopy, optical light pipes, etc.
 
 
Circular lenslet array
consists of large number of microlenses located in circles
High-efficiency DOEs using circular laser writing
system and ion etching
Gray-scale mask for fabrication of high
efficiency diffractive lenses via single optical exposure
 

DOEs with the following specifications are available

Specification of microlens arrays:
- Diameter of microlenses : 0.05~5㎜
- F-number, f/d : >2
- Diffractive efficiency : 70~90%
- Design wavelength : 0.2~1.6μm
- Wavefront errors : <λ/4
- Light field of circular array : <10㎜
- Rectangular array dimensions : <100x100㎟
- Substrate material : Glass, quartz

Specification of single circular DOEs:
- Diameter of DOEs : up to 100㎜
- Minimal width of blazed zone : 4μm
- Blazed profile depth : up to 2μm
- Diffractive efficiency (8μm zone width) for photoresist : >85% for quartz : >80%
- Design wavelength : 0.44~1.06μm
- Wavefront errors : < λ/4
- Materials of substrate and diffractive structure : quartz, glass+photoresist or SiO2 film