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Time Delay Compensators

Time Delay Compensators
Time Delay Compensators

Time delay compensators are made of calcite crystals or alpha-BBO crystals to compensate the time delay between two specified wavelengths with orthogonal polarizations.  The time delay between the fundamental pulses and harmonic pulses is introduced in a second harmonic generation (SHG) crystal as a result of the group velocity mismatch (GVM) in the crystal.  A time delay compensator generates an opposite GVM and therefore can be used to improve the overlap of the pulses for the subsequent process (e.g. third harmonic generation, THG in a second nonlinear crystal). 

The time delay is adjustable by rotation of  the compensator.  The specified delay ranges are based on a rotation of +/-12o (external).  A larger rotation can be applied for an extended delay range if there is no problem of beam clipping by the edge of the compensator.  
 

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Part No. Description Material Wavelength Delay Price Availability Add to Cart

 

Basic Properties of Calcite Crystal:
 

 Transparency Range: 350 - 2300 nm

material-ca.GIF (10982 bytes)

Transmission Curve

 Crystal Symmetry: Trigonal, R3c
 Lattice Constants: a=b=4,994A, c=17,081A
 Density:  2.71 g/cm3
 Optical Homogeneity: Δn < 10-6/cm
 Mohs Hardness: 3
 Thermal Expansion Coefficients:  αa = 4.9 x 10-6/K
 αc =  25.1 x 10-6/K
 Linear Absorption Coefficients: α<0.01cm-1 from 400 to 700 nm

 Sellmeier Equations: (λ in µm) :
  no2=2.69705 + 0.0192064/(λ2-0.01820)-0.0151624λ2 
  ne2=2.18438 + 0.0087309/(λ2-0.01018)-0.0024411λ2

 Wavelength(nm) no ne Birefringence
(Δn=ne-no)
Walk-off Angle
 at 45°
1064 1.6423 1.4797 -0.162 5.93°
800 1.6487 1.4821 -0.166 6.06°
632.8 1.6557 1.4852 -0.171 6.18°
532 1.6629 1.4886 -0.174 6.30°
400 1.6823 1.4974 -0.185 6.61°
355 1.6951 1.5032 -0.192 6.82°


 

Basic Properties of alpha-BBO Crystal:
 

 Transparency Range: 189 - 3500 nm

material-abbo.GIF (11478 bytes)

Transmission Curve

 Crystal Symmetry: Hexagonal R3c

 Lattice Symmetry: a=b=7.2351A,c=39.192A

 Density: 3.85 g/cm3
 Thermo-Optic Coefficients:
 dno/dT= - 9.3 x 10-6 /oC
 dne/dT= - 1 6 .6 x 10-6/oC
 Optical Homogeneity: Δn < 10-6/cm
 Mohs Hardness: 4.5
 Thermal Expansion Coefficients
  (in the range of 25–900oC)
 αa = 4 x 10-6/K
 αc = 36 x 10-6/K
 Linear Absorption Coefficients: α<0.005cm-1 from 300 to 2300 nm

 Sellmeier Equations (λ in µm) :
 no2=2.7471+0.01878/(λ2-0.01822)-0.01354λ2
 ne2=2.3715+0.01224/(λ2-0.01667)-0.01516λ2

 Wavelength(nm) no ne Birefringence
(Δn=ne -no)
Walk-off Angle
 at 45°
1550 1.6499 1.5298 -0.120 4.32°
1064 1.6579 1.5380 -0.120 4.29°
800 1.6639 1.5432 -0.121 4.30°
775 1.6647 1.5438 -0.121 4.30°
632.8 1.6706 1.5483 -0.122 4.34°
532 1.6776 1.5534 -0.124 4.39°
400 1.6963 1.5667 -0.130 4.54°
355 1.7087 1.5753 -0.133 4.64°
266 1.7617 1.6114 -0.150 5.08°

 

 

 



Specifications:
 

Surface Quality:

20/10 Scratch and Dig

Optical Axis Orientation: +/-0.5°

Parallelism:

< 15 arc sec

Flatness:

λ/4 @ 632.8 nm

Transmission Wavefront Distortion:

<λ/4 @ 632.8 nm

 

 

   
   
   
   
   

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