Del Mar Photonics - Newsletter
Ultrathin GaP crystals - request a quote
GaP crystal part number GaP_10_10_0.2_3 - request a quote
GaP <110> crystal with a thickness of 200μm optically contacted on GaP <100>
sustrate with a thickness of 3mm
Aperture, mm 10 x 10 +/-0.1
Thickness, mm 0.2 +/-10%
Substrate thickness, mm 3 +/-10%
Surface quality, scr-dig 40-20
Flatness, waves at 633 nm - 1 lambda
Parallelism, arc min < 3
we use undoped GaP, resistivity over 107 Ohm x cm, residual free carrier concentration of the order of (5-8)x1015 cm-3
Certificate of confirmity (actual)
Application - generation of T-rays (THz radiation, terahertz)
Del Mar Photonics supply variety of crystals for THz generation, including ZnTe, GaP, GaSe, LiNbO3 and others
Featured customer: University of Bordeaux, France
COLA1 specifications in the CPMOH.
COLA1 in the CPMOH is operational since the second quarter of the year 2008.
This platform is built around an (2x4.5 mJ) amplified femtosecond Ti: Al2O3 laser that supplies two Infrared beams lines which deliver at 1 kHz repetition rate, 50fs pulses, centered at 800 nm that have energy close to 4.5 mJ.
2.1. Tunable femtosecond beams.
The first beam line is exclusively dedicated to spectroscopic measurements. It includes two Optical Parametric Amplifiers (“TOPAS-C”). Each of them is pumped with 1 mJ. They generate tunable beams from 240 nm up to 22µm. The rest of the energy can be used directly at 800 nm, it can be injected in frequency doubling and tripling. These different supplied wavelengths can be used to excite electronic and vibration modes of many molecules with a great temporal dynamic ranging from few tens of femtoseconds up to hundreds of picoseconds.
The second beam is dedicated to THz Time Resolved Spectroscopy and it deserves several THz experiments.
Among these setups, one is a spectroscopic bench used to characterize materials in the 100 GHz to 3.5 THz spectral range. This last one is synchronized with two other Optical Parametric Amplifiers TOPAS which deliver tunable optical beams in between 240 nm and 11µm. Thus this system makes possible to carry on optical pump / THz probe experiments. Its originality is the use of tunable femtosecond laser light that excite materials and measure their response in the THz domain frequencies.
broadband THz bench. Frequency range 100 GHz – 3.5 THz
2.3. Detection tools.
We are able to characterize all kinds of samples (solid, liquid, crystal or gas), and we use many detection systems adapted to the different wavelength ranges. The beams lines are equipped with spectrometers, lock-in amplifiers, data acquisition cards, photodiodes and pyroelectric detectors…
Terahertz systems, set ups and components New band pass and long pass THz optical filters based on porous silicon and metal mesh technologies. Band pass filters with center wavelengths from 30 THz into GHz range and transmissions up to 80% or better. Standard designs with clear aperture diameters from 12.5 to 37.5 mm. Long pass filters with standard rejection edge wavelengths from 60 THz into GHz range. Maximum transmission up to 80% or better, standard designs at 19.0 and 25.4 mm diameters. Excellent thermal (from cryogenic to 600 K) and mechanical properties THz products: Portable Terahertz Source THz Spectrometer kit with Antenna THz transmission setup THz time domain spectrometer Pacifica fs1060pca THz time domain spectrometer Pacifica fs780pca THz detectors: Golay cell and LiTaO3 piroelectric detectors PCA - Photoconductive Antenna as THz photomixer Pacifica THz Time Domain Spectrometer - Trestles Pacifica Holographic Fourier Transform Spectrometer for THz Region Wedge TiSapphire Multipass Amplifier System - THz pulses generation Terahertz Spectroscopic Radar Mobile System for Detection of Concealed Explosives Band pass filters with center wavelengths from 30 THz into GHz range Long pass filters with standard rejection edge wavelengths from 60 THz into GHz range Generation of THz radiation using lithium niobate Terahertz crystals (THz): ZnTe, GaAs, GaP, LiNbO3 - Wedge ZnTe Silicon Viewports for THz radiation - sample specs Aspheric collimating silicon lens - Aspheric focusing silicon lens more
iPCA - interdigital Photoconductive Antenna for terahertz waves
Large area broadband antenna with lens array and high emitter conversion efficiency
iPCA with LT-GaAs absorber, microlens array for laser excitation wavelengths l £ 850 nm, adjusted hyperhemispherical silicon lens with a high power conversion efficiency of 0.2 mW THz power / W optical power. The iPCA can be used also as large area THz detector. The two types iPCAp and iPCAs have the same active interdigital antenna area but different contact pad directions with respect to the electrical THz field.
Interdigital Photoconductive Antenna for terahertz waves generation using femtosecond Ti:Sapphire laser
from Del Mar Photonics
Trestles Pacifica THz Time Domain Spectrometer is a modular tabletop system for scientific and industrial applications of pulsed THz radiation.
New THz band pass and long pass optical filters based on porous silicon and metal mesh technologies
Terahertz products from Del Mar Photonics
GaP crystals fro THz generation - ZnTe crystals for THz generation
Del Mar Photonics, Inc.
4119 Twilight Ridge
San Diego, CA 92130
tel: (858) 876-3133
fax: (858) 630-2376