Del Mar Photonics
Pulse Compression Gratings - Instructions for ordering -
When ordering a grating, please use the following example format below, or choose from the standard PC grating stock list...
PC 1200 W x H x Thk 800 nm (TM/-1) constant deviation 8°
1. PC stands for pulse compression
2. 1200 is the groove density (groove frequency) in grooves/mm
3. W is the blank dimension in mm parallell with the grating grooves
4. H is the blank dimension in mm perpendicular to the grating grooves
5. Thk is the blank thickness in mm
6. 800 nm is the desired optimized wavelength. A range or range with peaked wavelength can also be specified
7. (TM/-1) is desired polarization state and diffraction order the grating should be optimized for. TE and average (TM+TE)/2 can also be specified
8. Constant deviation 8° is the configuration the grating should be optimized for. Constant incidence angle can also be specified
Standard tolerances on W, H, Dia: ± 0.2 mm Thk ± 0.5 mm
CA > 90 % of blank size
Standard Pulse Compression gratings Type PC, specified by combining from:
25 x 25 x 6 mm
30 x 30 x 6 mm
30 x 64 x 10 mm
30 x 75 x 16 mm
30 x 110 x 16 mm
50 x 50 x 10 mm
50 x 110 x 16 mm
58 x 58 x 10 mm
64 x 64 x 10 mm
90 x 90 x 16 mm
110 x 110 x 16 mm
120 x 140 x 20 mm
NIR 750-1064 nm
@ 790 nm
@ 800 nm
@ 920 nm
@ 1032 nm
@ 1053 nm
@ 1064 nm
Typical near Littrow
Other specifications available on request.
Note: The absolute efficiency curves shown are only representative for the stated geometry and wavelength(s) and can vary depending on use geometry and measurement technique *)
Pulse Compression Gratings
These gratings are especially suited for use in laser pulse compression experiments. High diffraction efficiency, in combination with good spectral quality and high damage resistance makes these gratings useful in all kinds of laser pulse applications; both pulse compression using optical fibre grating pairs, and for amplification of pulses with chirped pulse amplification.
Fibre grating compressor
When a short laser pulse is transmitted through an optical fibre, the pulse will be stretched, or "chirped" due to nonlinear effects (selfphase modulation). The group velocity dispersion in the fibre results in that the front of the pulse will have a longer wavelength than the tail. By using a pair of gratings one can arrange so that the long wavelength pulse will travel a longer path than the short wavelength pulse, with the result that, after the grating pair, they arrive at the same time. The grating pair not only compensates for the pulse broadening in the fibre, but makes the pulse even shorter than the input; up to 90 times compression can be achieved.
Chirped pulse amplification
Very short pulses (100 femtoseconds) can be produced by some types of mode locked lasers. For many applications, these pulses have too low peak power. The technique of chirped pulse amplification (CPA) can be used for amplifying such pulses, to achieve peak powers in the order of Terawatts.
The amplifier is basically a laser crystal inside a resonator. To avoid strong nonlinear effects which would destroy the crystal, the input pulse is stretched in time, so that the peak power is decreased. This chirped pulse is then amplified, and subsequently compressed to obtain a high power pulse with a duration nearly equal to the input pulse.
Stretching and compression with grating pairs
Both stretching and compressing utilize grating pairs, arranged in subtractive dispersive mode; so that the angular dispersion of the first grating is cancelled by the second grating. Two parallel beams of different wavelengths, incident on the first grating, are still parallel when they leave the second grating, but they have travelled different distances.
A grating pair arranged parallel as in fig.A, will introduce a negative group velocity dispersion, i.e. pulses of long wavelength arrive later than short wave pulses.
In order to achieve a positive dispersive delay, a more complicated arrangement is necessary. Fig.B shows such an arrangement, normally used in the stretcher stage. An afocal lens system (telescope) is inserted between the gratings. The telescope reverses the sign of the angles so that the beams will hit the second grating at the same angle as they leave the first one.
Both stretcher and compressor are normally used in double pass. The advantages are twofold: the dispersion is doubled, and all wavelength components of the beam emerge colinear, not linearly translated as shown in the figure for single pass.
Extremely low stray light
The gratings are holographically recorded with two highly collimated, clean and homogeneous beams, which give straight and equispaced grooves. The diffracted light is free from "ghosts" and give very low levels of randomly scattered light.
High efficiency and low loss
The groove profile of the pulse compression gratings is optimized to give maximum efficiency for light polarized perpendicularly to the grooves (TM polarization).
Absolute efficiency of a pulse compresslon grating, 1800 gr/mm, gold coated, in Littrow configuration
The efficiency depends on the wavelength and configuration, but frequently an absolute efficiency of more than 90% for each grating is achieved. The figure shows the efficiency of a gold coated grating with 1800 grooves/mm, in a Littrow configuration.
Not only the diffraction efficiency is important. In order to avoid thermal effects, the absorption in the grating surface should be as small as possible. Therefore, a coating material with high reflectance should be used. In the NIR region, gold coated gratings have the best performance.
Flat diffracted wavefront
The combination of a flat grating surface and a holographic exposure setup of high optical quality, gives a flat diffracted wavefront. This gives the possibility to focus the laser pulse to high intensities.
Pulse compression grating for Yb-based femtosecond laser
Product news and updates - Training Workshops - Featured Customer - Other News
| Trestles LH Ti:Sapphire
Trestles LH is a new series of high quality femtosecond Ti:Sapphire lasers for applications in scientific research, biological imaging, life sciences and precision material processing. Trestles LH includes integrated sealed, turn-key, cost-effective, diode-pumped solid-state (DPSS). Trestles LH lasers offer the most attractive pricing on the market combined with excellent performance and reliability. DPSS LH is a state-of-the-art laser designed for today’s applications. It combines superb performance and tremendous value for today’s market and has numerous advantages over all other DPSS lasers suitable for Ti:Sapphire pumping. Trestles LH can be customized to fit customer requirements and budget.
DPSS DMPLH lasers
|New laser spectrometer
T&D-scan for research that
demands high resolution and high spectral
density in UV-VIS-NIR spectral domains - now available with
new pump option!
The T&D-scan includes a CW ultra-wide-tunable narrow-line laser, high-precision wavelength meter, an electronic control unit driven through USB interface as well as a software package. Novel advanced design of the fundamental laser component implements efficient intra-cavity frequency doubling as well as provides a state-of-the-art combined ultra-wide-tunable Ti:Sapphire & Dye laser capable of covering together a super-broad spectral range between 275 and 1100 nm. Wavelength selection components as well as the position of the non-linear crystal are precisely tuned by a closed-loop control system, which incorporates highly accurate wavelength meter.
AOTF Infrared Spectrometer
Open Microchannel Plate Detector
now in stock!
|Hummingbird EMCCD camera
The digital Hummingbird EMCCD camera combines high sensitivity, speed and high resolution.
It uses Texas Instruments' 1MegaPixel Frame Transfer Impactron device which provides QE up to 65%.
Hummingbird comes with a standard CameraLink output.
It is the smallest and most rugged 1MP EMCCD camera in the world.
It is ideally suited for any low imaging application such as hyperspectral imaging, X-ray imaging, Astronomy and low light surveillance.
It is small, lightweight, low power and is therefore the ideal camera for OEM and integrators.
femtosecond transient absorption data acquisition system
Future nanostructures and biological nanosystems will take advantage not only of the small dimensions of the objects but of the specific way of interaction between nano-objects. The interactions of building blocks within these nanosystems will be studied and optimized on the femtosecond time scale - says Sergey Egorov, President and CEO of Del Mar Photonics, Inc. Thus we put a lot of our efforts and resources into the development of new Ultrafast Dynamics Tools such as our Femtosecond Transient Absorption Measurements system Hatteras. Whether you want to create a new photovoltaic system that will efficiently convert photon energy in charge separation, or build a molecular complex that will dump photon energy into local heat to kill cancer cells, or create a new fluorescent probe for FRET microscopy, understanding of internal dynamics on femtosecond time scale is utterly important and requires advanced measurement techniques.
spot in our Ultrafast Dynamics Tools
training workshop in San Diego, California.
spot in our Ultrafast Dynamics Tools
training workshop in San Diego, California.
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: 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, GaP, LiNbO3 - Wedge ZnTe
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
|IntraStage lowers the cost
of test data management!
Struggling with gigabytes or terabytes of test data?
IntraStage easily transforms test data from disparate sources into web-based quality metrics and engineering intelligence you can use.
us today to discuss your test management requirements and specifications of your
|Come to San Diego next summer! Attend one of our training workshops in San Diego, California
during summer 2011
Del Mar Photonics has presented training workshops for customers and potential customers in the past 3 years.
Our workshops cover scientific basics, technical details and provide generous time for hands-on training.
Each workshop is a three-day seminar conducted by professional lecturer from 10am to 4pm. It includes lunch, as well as a training materials. We have also reserved two days for Q&A sessions, one-on-one system integration discussions, social networking, and San Diego sightseeing.
The following training workshops will be offered during this
Mar Photonics offers new
Trestles fs/CW laser system which can be easily
switched from femtosecond mode to CW and back. Having both modes of operation in one system dramatically increase a
number of applications that the laser can be used for, and makes it an ideal
tool for scientific lab involved in multiple research projects.
Frequency-stabilized CW single-frequency ring Dye laser DYE-SF-007 pumped by DPSS DMPLH laser installed in the brand new group of Dr. Dajun Wang at the The Chinese University of Hong Kong.
DYE-SF-077 features exceptionally narrow generation line width, which amounts to less than 100 kHz. DYE-SF-077 sets new standard for generation line width of commercial lasers. Prior to this model, the narrowest line-width of commercial dye lasers was as broad as 500 kHz - 1 MHz. It is necessary to note that the 100-kHz line-width is achieved in DYE-SF-077 without the use of an acousto-optical modulator, which, as a rule, complicates the design and introduces additional losses. A specially designed ultra-fast PZT is used for efficient suppression of radiation frequency fluctuations in a broad frequency range. DYE-SF-077 will be used in resaerch of Ultracold polar molecules, Bose-Einstein condensate and quantum degenerate Fermi gas and High resolution spectroscopy
Optical Society of Southern California meeting at UCSD OSSC 2011-04-27
Nd:YAG laser ordered by the University of Leon, UANL, Mexico
Wedge 50 Multipass Amplifier pumped with a Darwin-527-30-M DPSS Laser ordered by Hong Kong customer
New Trestles LH10-fs/CW femtosecond+CW laser ready for delivery to the University of California Santa Cruz
Trestles femtosecond Ti:Sapphire laser delivered to North Carolina State University
Del Mar Photonics sponsor IONS (International OSA Network of Students) conference IONS-NA-2 in Tucson, Arizona IONS-NA-2 website
Best talk and best poster awards at IONS-Moscow 2010 conference sponsored by Del Mar Photonics
Watch Del Mar Photonics videos!
Del Mar Photonics is now on Twitter!
Del Mar Photonics featured components
Del Mar Photonics continuously expands its components portfolio.
Prisms for Concentrating Photovoltaic Systems (CPV)
Solar cells made of compound semiconductors such as gallium arsenide are very expensive. Usually very small cells are installed and various means such as mirrors, lenses, prisms, etc..are used to concentrate sunlight on the cells. Concentration photovoltaic technology (CPV) uses the solar radiation with an efficiency of 40%, double that of conventional solar cells
Del Mar Photonics design custom Concentrating Photovoltaic Systems (CPV) and supply variety of the optical components for CPV such as solar prisms shown in the picture.
Axicon lens also known as conical lens or rotationally symmetric prism is widely used in different scientific research and application. Axicon can be used to convert a parallel laser beam into a ring, to create a non diffractive Bessel beam or to focus a parallel beam into long focus depth.
Del Mar Photonics supplies axicons with cone angles range from 130° to 179.5° for use with virtually any laser radiation. We manufacture and supply axicons made from BK7 glass, fused silica and other materials.
download brochure - request a quote
Rutile (TiO2) coupling
Del Mar Photonics offers optical elements made of high quality synthetically grown Rutile Titanium Dioxide crystals. Rutile’s strong birefringency, wide transmission range and good mechanical properties make it suitable for fabrication of polarizing cubes, prisms and optical isolators. Boules having high optical transmission and homogeneity are grown by proprietary method. Typical boules have 10 - 15 mm in dia. and up to 25 mm length. Optical elements sizes - from 2 x 2 x 1 mm to 12.7 x 12.7 x 12.7 mm. Laser grade polish quality is available for finished elements. So far we the largest elements that we manufactured are 12 x15 x 5 mm, in which optical axis is parallel to 15 mm edge, 5 mm is along beam path, 12 x 15 mm faces polished 20/10 S/D, one wave flatness, parallelism < 3 arc.min. (better specs. available on request).
more details - download brochure - request a quote
Del Mar Photonics offer a range of competitively priced UHV viewports , Conflat, ISO or KF including a variety of coatings to enhance performance. Del Mar Photonics viewports are manufactured using advanced techniques for control of special and critical processes, including 100 percent helium leak testing and x-ray measurements for metallization control. Windows Materials include: Fused silica, Quartz , Sapphire , MgF2, BaF2, CaF2, ZnSe, ZnS, Ge, Si, Pyrex. Standard Viewing diameters from .55" to 1.94 ".
Coating - a range of custom coatings can applied - which include
- Single QWOT
- Broad Band AR
- V coatings
- DLC (Diamond like coating)
more details - request a quote
Thyratrons are used in
such devices as radars with different power levels, high-power pulsed
technical, electrophysical, medical devices and lasers. Sophisticated
design and high quality ceramic-metal envelope determines long lifetime
and very accurate and reliable operation of hydrogen thyratrons under wide range of environmental
- pulsed lasers power supplies
- medical apparatus
- electrophysical instrumentation
Triggered Three-Electrode Spark Gap Switches are ceramic-metal sealed off gas discharge trigatron-type devices with a co-axial trigger electrode. These Gas Discharge Tubes contain no mercury and, due to an advanced design, feature high reliability and a long lifetime being operating under wide range of environmental conditions.
- pulsed installation for processing materials
- installations with plasma focus
- pulse power supplies for lasers and other pulse equipment
- medical apparatus such as lithotriptors and defibrillators
- processing systems for petroleum wells
|We are looking forward to hear from you and help you with your optical and crystal components requirements. Need time to think about it? Drop us a line and we'll send you beautiful Del Mar Photonics mug (or two) so you can have a tea party with your colleagues and discuss your potential needs.|
Del Mar Photonics, Inc.
4119 Twilight Ridge
San Diego, CA 92130
tel: (858) 876-3133
fax: (858) 630-2376