Del Mar Photonics - Newsletter December 2010 - Newsletter April 2011

Terahertz THz crystals

Del Mar Photonics supply variety of crystals for THz generation, including ZnTe, GaP, GaSe, LiNbO3 and others.

Below are just few examples of the standard and custom products. Visit our online store to place your order or contact us for custom inquiry today.

Case study under development: Wedge-like [110]-oriented ZnTe

Customer inquiry:
We would like to ask a quotation of [110]-oriented ZnTe crystal for THz  application.
We need 2 crystals: one in wedge and the other in parallel. Both have  the thickness at around 2 mm and the rectangular edge at 10 mm * 10 mm.
Attached the details of our requirements.

Related publications:
Study of ultrabroadband terahertz radiation from wedge-shaped ZnTe
Nakajima, M. Tani, M. Hangyo, M. Inst. of Solid State Phys., Tokyo Univ., Chiba, Japan
Infrared and Millimeter Waves, 2004 and 12th International Conference on Terahertz Electronics, 2004.

We report detailed thickness dependence of ultrabroadband terahertz (THz) radiation using wedge-shaped ZnTe. The spectral width and intensity of the radiation strongly depend on the thickness. The THz radiation at 10-μm thickness has a pulse width of 50 fs and the spectrum extends up to 50 THz. Several spectral dips whose frequency depends on the thickness systematically are observed and explained by the phase matching condition.
 

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THz Generation and Detection in ZnTe - buy from online store - request a quote

THz generation occurs via optical rectification in a <110> ZnTe. Optical rectification is a difference frequency mixing and occurs in media with large second order susceptibility, c(2). Optical rectification is actually analogous to frequency doubling. That is, a polarization is induced in the crystal that is the difference of the individual frequencies instead of their sum. This is due to the well known trigonometric relation: cos(A) * cos(B) = [cos(A+B) + cos(A-B)] / 2. Thus, light of a given frequency passing through a nonlinear medium will generate the same amount of both sum and difference frequencies, corresponding to second harmonic and dc. Another way of describing these processes is to consider the polarization induced in a medium at frequency 2w when it is driven at frequency w:

P(2w) = c(2w; w, +w) E(w)E(w) Frequency doubling
P(WTHz) = c(W THz; w, - w) E(w)E(w) Optical Rectification

For ultrashort laser pulses that have large bandwidth the frequency components are differenced with each other to produce bandwidth from 0 to several THz. Using either way to describe the process, the generated pulse is the envelope of the optical pulse.

Detection of the THz pulse occurs via free-space electro-optic detection in another <110> oriented ZnTe crystal. The THz pulse and the visible pulse are propagated collinearly through the ZnTe crystal. The THz pulse induces a birefringence in ZnTe crystal which is read out by a linearly polarized visible pulse. When both the visible pulse and the THz pulse are in the crystal at the same time, the visible polarization will be rotated by the THz pulse. Using a l/4 waveplate and a beamsplitting polarizer together with a set of balanced photodiodes, we "map" the THz pulse amplitude by monitoring the visible pulse polarization rotation after the ZnTe crystal at a variety of delay times with respect to the THz pulse.

The ability to read out the full electric field, both amplitude and delay, is one of the attractive features of time-domain THz spectroscopy. Note, the visible and THz pulses are collinearly propagated through the ZnTe crystal even though in the figure they appear to be propagate at an angle.

 

 Model   Product Name+   Buy Now 
 CR-ZnTe-10-1   ZnTe crystal, 10x1 mm, 110-cut  Buy Now 
 CR-ZnTe-10-0.5   ZnTe crystal, 10x10x0.5 mm, 110-cut  Buy Now 
 CR-ZnTe-10-10-1   ZnTe crystal, 10x10x1 mm, 110-cut  Buy Now 
 CR-ZnTe-20-20-0.2   ZnTe crystal, 20x20x0.2 mm, 110-cut  Buy Now 
 CR-ZnTe-6-6-0.2   ZnTe crystal, 6x6x0.2 mm, 110-cut  Buy Now 


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GaP Gallium Phosphite crystals for Terahertz THz applications request a quote - buy standard GaP crystals from online store

 

GaP crystal part number GaP_10_10_0.002_3 - request a quote

GaP <110> crystal with a thickness of 200μm stuck
(optically contacted) on one GaP <100> with a thickness of 3mm

Aperture, mm 10 x 10 +/-0.1
Thickness of each component, mm 0.002 and 3 +/-10%
Orientation 110 -- 110
Surface quality, scr-dig 40-20 -- 40-20
Flatness, waves at 633 nm - 1
Parallelism, arc min < 3

Certificate of confirmity (actual)

 Model   Product Name+   Buy Now 
 CR-GaP-10-10-0.5   GaP crystal, 100-cut, 10x10x0.5 mm  Buy Now 
 CR-GaP-10-10-0.1   GaP crystal, 110-cut, 10x10x0.1 mm  Buy Now 
 CR-GaP-10-10-0.2   GaP crystal, 110-cut, 10x10x0.2 mm  Buy Now 
 CR-GaP-10-10-0.3   GaP crystal, 110-cut, 10x10x0.3 mm  Buy Now 
 CR-GaP-10-10-0.5   GaP crystal, 110-cut, 10x10x0.5 mm  Buy Now 
 CR-GaP-10-10-1   GaP crystal, 110-cut, 10x10x1 mm  Buy Now 
 CR-GaP-10-10-4   GaP crystal, 110-cut, 10x10x4 mm  Buy Now 
 CR-GaP-10-10-5   GaP crystal, 110-cut, 10x10x5 mm  Buy Now 
 CR-GaP-10-8-0.15   GaP crystal, 110-cut, 10x8x0.15 mm  Buy Now 
 CR-GaP-19-19-0.2   GaP crystal, 110-cut, 19x19x0.2 mm  Buy Now 
 CR-GaP-19-21-0.3   GaP crystal, 110-cut, 19x21x0.3 mm  Buy Now 
 CR-GaP-5-5-0.1   GaP crystal, 110-cut, 5x5x0.1 mm  Buy Now 
 CR-GaP-5-5-0.25   GaP crystal, 110-cut, 5x5x0.25 mm  Buy Now 
 CR-GaP-5-5-0.85   GaP crystal, 110-cut, 5x5x0.85 mm  Buy Now 
 CR-GaP-8-8-0.2   GaP crystal, 110-cut, 8x8x0.2 mm  Buy Now 

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Gallium Selenide (GaSe) non-linear crystal for THz generation Request a quote or buy from online store

GaSe has wide transparency range, large non-linear coefficient and high damage threshold

 Model   Product Name+   Buy Now 
 CR-GaSe-10-10-1   GaSe crystal, Z-cut, 10x10x1 mm  Buy Now 
 CR-GaSe-5-5-0.1   GaSe crystal, Z-cut, 5x5x0.1 mm  Buy Now 
 CR-GaSe-5-5-0.15   GaSe crystal, Z-cut, 5x5x0.15 mm  Buy Now 
 CR-GaSe-5-5-0.2   GaSe crystal, Z-cut, 5x5x0.2 mm  Buy Now 
 CR-GaSe-5-5-0.35   GaSe crystal, Z-cut, 5x5x0.35 mm  Buy Now 
 CR-GaSe-5-5-1   GaSe crystal, Z-cut, 5x5x1 mm  Buy Now 

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LiNbO3 and MgO:LiNbO3 for THz generation Request a quote - Buy from online store

Customer wrote: We want to generate THz wave in these crystals with femtosecond amplified laser beam @ 800nm.
We need to pump the crystal with tilted IR pulse to generate a THz beam in the orthogonal direction of the end side.

The following crystals are used:

Stoichiometric MgO(0.6%):LiNBO3 Y-cut 5 x 5 x 9.81 mm
5 x 5 mm^2 laser grade polished, with the end side cut at
63 and AR coating at 800nm on the both sides.
Type: prism
Material: Stoichiometric MgO(0.6%):LiNBO3
Dimensions: 5 mm x 5 mm x 9.81 mm
Coating: AR coating at 800nm on the both sides

Part number: MgO(0.6%): LiNbO3_5_5_9.83 - request a quote

 

sample certificate of conformity

 Model   Product Name+   Buy Now 
 CR-Fe-LiNbO3-25-25-1   Fe-LiNbO3 crystal, Z-cut, 25x25x1 mm  Buy Now 
 CR-Fe:LiNbO3-15-15-2   Fe:LiNbO3 crystal, 90 deg.-cut, 15x15x2 mm  Buy Now 
 CR-Fe:LiNbO3-2-3-6   Fe:LiNbO3 crystal, 90 deg.-cut, 2x3x6 mm  Buy Now 
 CR-Fe:LiNbO3-1-8-10   Fe:LiNbO3 crystal, X,Y,Z, 1x8x10 mm  Buy Now 
 CR-LiNbO3-10-10-50   LiNbO3 crystal, 47 cut, 10x10x50 mm  Buy Now 
 CR-LiNbO3-10-5-50   LiNbO3 crystal, 47 cut, 10x5x50 mm  Buy Now 
 CR-LiNbO3-6-6-30   LiNbO3 crystal, X,Y,Z, 6x6x30 mm  Buy Now 
 CR-LiNbO3-7-7-25   LiNbO3 crystal, X,Y,Z, 7x7x25 mm  Buy Now 
 CR-LiNbO3-9-9-25   LiNbO3 crystal, X,Y,Z, 9x9x25 mm  Buy Now 
 CR-LiNbO3-6-6-30   LiNbO3 crystal, X-cut, 6x6x30 mm  Buy Now 
 CR-LiNbO3-22-8-1   LiNbO3 crystal, Y+36 deg., 22x8x1 mm  Buy Now 
 CR-LiNbO3-6-6-30   LiNbO3 crystal, Z-cut, 6x6x30 mm  Buy Now 
 CR-MgO-LiNbO3-10-10-   MgO:LiNbO3 crystal, 90-cut, 10x10x2 mm  Buy Now 
 CR-MgO-LiNbO3-2-2-20   MgO:LiNbO3 crystal, Y-cut, 2x2x20 mm  Buy Now 
 CR-MgO-LiNbO3-3-3-10   MgO:LiNbO3 crystal, Y-cut, 3x3x10 mm  Buy Now 
 CR-MgO-LiNbO3-3-3-15   MgO:LiNbO3 crystal, Y-cut, 3x3x15 mm  Buy Now 
 CR-MgO-LiNbO3-3-3-20   MgO:LiNbO3 crystal, Y-cut, 3x3x20 mm  Buy Now 
 CR-MgO-LiNbO3-10-10-   MgO:LiNbO3 crystal, Z -cut, 10x10x0.5 mm  Buy Now 
 MgO-LiNbO3-10-10-1   MgO:LiNbO3 crystal, Z-cut, 10x10x1 mm  Buy Now 
 PPLN-LiNbO3-0.5-10-0   Periodically poled LiNbO3 second-harmonic generation crystal  Buy Now 

Del Mar Photonics, Inc.
4119 Twilight Ridge
San Diego, CA 92130
tel: (858) 876-3133
fax: (858) 630-2376
Skype: delmarphotonics
sales@dmphotonics.com
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