Del Mar Photonics

Holographic Fourier Transform Spectrometer for THz Region

Photoconductive antenna for THz waves is used to build Holographic Fourier Transform Spectrometer for THz Region

Nick Agladze, Del Mar Photonics' customer wrote:

The PCA antenna works fine. There are few tricks I learned with it to improve the performance and now I have the THz signal out of it almost saturating the Bruker FIR DTGS detector. This is great!

Regarding the application. We use this emitter to test our new THz holographic Fourier transform spectrometer (HFTS). The paper describing its design is coming out in Optics Letters. The preprint is in the attachment. We are still preparing the experimental paper and I will send it to you as soon as it will be accepted if you are interested.

 

Holographic Fourier Transform Spectrometer for THz Region - Request a quote

 

Other products from Del Mar Photonics for THz applications:

Del Mar Photonics supply Ti:Sapphire lasers for THz pulses generation, as well as complete THz generation and detection system - e-mail us for details!

Wedge TiSapphire Multipass Amplifier - Request a quote

Pacifica THz Spectrometer

Crystals for THz generation:


Gallium Phosphor GaP 110-cut crystals for THz applications
GaSe is used as infrared nonlinear crystal and for THz applications GaSe crystal, Z-cut, 10x10x1 mm
ZnTe crystals for THz generation  ZnTe crystal, 10x10x0.5 mm, 110-cut 

 

Application notes from Del Mar Photonics customer:

THz Generation and Detection in ZnTe

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.

 

 
 

PCA
PCA Photoconductive Antenna for terahertz waves NOTE: All prices are subject to change due to a currency fluctuations! E-mail for quote with current prices.


800 nm
990-1060 nm
1040 nm
New Products For June

PCA: resonance frequency 1.5 THz, λ ~ 1040 nm, gap distance 14 µm
$825.00
PCA: resonance frequency 1.5 THz, λ ~ 1040 nm, gap distance 14 µm
$1,950.00
PCA: resonance frequency 1.5 THz, λ ~ 1040 nm, gap distance 10 µm
$1,950.00

PCA: resonance frequency 1.5 THz, λ ~ 1040 nm, gap distance 10 µm
$825.00
PCA: resonance frequency 1 THz, λ ~ 1040 nm, gap distance 34 µm
$825.00
PCA: resonance frequency 1 THz, λ ~ 1040 nm, gap distance 34 µm
$1,950.00

PCA: resonance frequency 1 THz, λ ~ 1040 nm, gap distance 16 µm
$825.00
PCA: resonance frequency 1 THz, λ ~ 1040 nm, gap distance 16 µm
$1,950.00
PCA: resonance frequency 1 THz, λ ~ 1040 nm, gap distance 6 µm
$825.00

 

ZnTe crystal news and updates

Terahertz pulse generation
Ultrafast E-O Sampling using ZnTe Crystal and Ti:sapphire Laser
Ultrafast sub-ps resolution electro-optic (E-O) sampling system using ZnTe crystal and Ti:sapphire laser
Zinc telluride (ZnTe) crystal structure, lattice parameters
substance: zinc telluride (ZnTe). 26s08d12. property: crystal structure, lattice parameters, thermal expansion. crystal structure: zincblende, space group F
Growth and characterization of <110> oriented ZnTe single crystal
Optical Characterization of ZnTe Single Crystal
THz Generation and Detection in ZnTe
Detection of the THz pulse occurs via free-space electro-optic detection in another <110> oriented ZnTe crystal
Greyhawk Optics - ZnTe crystal, 10x10x0.5 mm, 110-cut
The peak of the THz pulse amplitude shows a three-fold rotational symmetry when the ZnTe detector crystal is rotated by 360° about an axis normal to the ...
The generation of terahertz (THz) pulses by the optical rectification of femtosecond laser pulses in a ZnTe crystal
Annealing effects of a high-quality ZnTe substrate
 

Femtosecond Lasers - Reserve a spot in our femtosecond Ti:Sapphire training workshop during this summer in San Diego, California

Trestles femtosecond Ti:Sapphire laser
Trestles Finesse femtosecond Ti:Sapphire laser with integrated DPSS pump laser
Teahupoo Rider femtosecond amplified Ti:Sapphire laser
Mavericks femtosecond Cr:Forsterite laser
Tamarack femtosecond fiber laser (Er-doped fiber)
Buccaneer femtosecond OA fiber laser (Er-doped fiber) and SHG
Cannon Ultra-broadband light source
Tourmaline femtosecond Yt-doped fiber laser

 

Pulse strecher/compressor
Avoca SPIDER system
Buccaneer femtosecond fiber lasers with SHG Second Harmonic Generator
Cannon Ultra-Broadband Light Source
Cortes Cr:Forsterite Regenerative Amplifier
Infrared cross-correlator CCIR-800
Cross-correlator Rincon
Femtosecond Autocorrelator IRA-3-10
Kirra Faraday Optical Isolators
Mavericks femtosecond Cr:Forsterite laser
OAFP optical attenuator
Pearls femtosecond fiber laser (Er-doped fiber, 1530-1565 nm)
Pismo pulse picker
Reef-M femtosecond scanning autocorrelator for microscopy
Reef-RTD scanning autocorrelator
Reef-SS single shot autocorrelator
Femtosecond Second Harmonic Generator
Spectrometer ASP-100M
Spectrometer ASP-150C
Spectrometer ASP-IR
Tamarack and Buccaneer femtosecond fiber lasers (Er-doped fiber, 1560+/- 10nm)
Teahupoo femtosecond Ti:Sapphire regenerative amplifier
Femtosecond third harmonic generator
Tourmaline femtosecond fiber laser (1054 nm)
Tourmaline TETA Yb femtosecond amplified laser system
Tourmaline Yb-SS femtosecond solid state laser system
Trestles CW Ti:Sapphire laser
Trestles femtosecond Ti:Sapphire laser
Trestles Finesse femtosecond lasers system integrated with DPSS pump laser
Wedge Ti:Sapphire multipass amplifier

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