Germanium windows - featured customer Yeheng Wu

Germanium windows - featured customer Yeheng Wu

BOARD 98 THE DEVELOPMENT OF ONE-DIMENSIONAL, MULTILAYERED PVK/PVA PHOTONIC CRYSTALS. Dora C. Huang, Yeheng Wu, 28118 Edgepark BIvd, Westlake OH 44145 (Hathaway Brown School).

Photonic crystals are known for their unusual properties regarding the propagation of light and their bandgaps. A photonic bandgap, which contains many of the same features of an electronic bandgap in a semiconductor, is a forbidden region for photons (light). These bandgaps can be created with materials that have a large difference in their refractive indices and can be viewed on a transmission graph as a dip, with the dip representing low light transmittance. The purpose of this project was to create a one-dimensional, multilayered, polymer photonic crystal, where its bandgap could be viewed through a graph of its transmission, taken from a spectrophotometer. It was hypothesized that the experiment would produce such a crystal and that a dip in the transmission of light would occur at visible to near infrared range on the graph, indicating a bandgap with an expected width of 140 nm. The crystal (n=4) was created by spin coating alternating layers of poly vinylcarbazole (PVK) and poly vinylalcohol (PVA). The transmittance curve of the thirteen layer sample showed a 39 percent dip in the transmission at 900 nm (near the center of the bandgap that stretched from approximately 825 nm-990 nm), which provided evidence that the sample created was the periodic structure desired. These one-dimensional photonic crystals can be used to create very small lasers, when the crystal is doped with laser dye, or added to a substance to create extremely white pigment.
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Germanium optics - Ge

Model	Product Name+	Buy Now
CPPE-Ge-38.1-4	Germanium circular plane parallel etalon, ø 38.1 mm x 4 mm
E-Ge-1.25-3	Germanium etalon, ø 1.25" x 3"
E-Ge-12.7-25.4	Germanium etalon, ø 12.7 mm x 25.4 mm (ø 0.5" x 1")
RAP-Ge-1	Germanium right angle prism, 25.4x25.4x25.4 mm
W-Ge-114.3-5-AR	Germanium window, ø 114.3 mm x 5.0 mm, AR coated 8-12 micron
W-Ge-125-6	Germanium window, ø 125 mm x 6 mm
W-Ge-125-6-8-12	Germanium window, ø 125 mm x 6 mm, coating AR/DCL 8-12 µm
W-Ge-25.4-3	Germanium window, ø 25.4 mm x 3 mm
W-Ge-38.1-4	Germanium window, ø 38.1 mm x 4 mm
W-Ge-38.1-4-10.6	Germanium window, ø 38.1 mm x 4 mm, coated 10.6 µm
W-Ge-50.8-3	Germanium window, ø 50.8 mm x 3 mm
W-Ge-50.8-3	Germanium window, ø 50.8 mm x 3 mm
W-Ge-50.8-5	Germanium window, ø 50.8 mm x 5 mm
W-Ge-60-3-CTS	Germanium window, ø 60 mm x 3 mm

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request a quote for custom Germanium optics

Ge (Germanium) optical components - windows - etalons - Diamond-like carbon coating - buy online

Quantum Cascade Lasers Calibration

Customer wrote:
My application is calibrate the relative wavelength of tunable quantum cascade lasers in the mid-infrared (~10 microns). The laser itself is used for remote sensing of atmospheric gases.

FSR (Free Spectral Range) is determined by etalon length L and wavelength of operation λ

FSR= (λ²) / (2*n*L)

The most popular standard etalon is 1 inch long
For longer wavelength (> 10 micron) it's often necessary to use etalons 2-3 inches long to get required accuracy of calibration.

Del Mar Photonics offer variety of standard as well as custom germanium etalons.

Here are few examples of Ge etalon specifications:

Ge etalon part number #GEFPE1/0.5 request a quote - sold in Greyhawk Optics nline store as part number E-Ge-12.7-25.4
Length 1.00 +/- 0.01 inch
Diameter 0.50 +/- 0.05 inch
1/4 lambda flat each end, HeNe
parallel to 3 ARC SEC or better
length measure to 0.0005"
small bevels
surface quality F-f(80/50) per MIL-F-48616

Ge etalon part number #GEFPE3/1.25 - request a quote
Length 3.00 +/- 0.01 inch
Diameter 1.25+/- 0.05 inch
Other specification as in #GEFPE1/05
Ge etalon part number #GEFPE20mm/1.5

Ge etalon part number #GEFPE20mm/1.5 - request a quote
dia 38.1 (-0.1) mm
thickness: 20 (+/-0.1) mm
Flatness: 1 fringe ( Lambda/2 at 633 nm) , delta N = 0.2 fringes
Surface quality: 60-40 s/d
Parallelism: < 2 sec
Perpendicularity: 5 min

Model	Product Name+	Buy Now
CPPE-Ge-38.1-4	Germanium circular plane parallel etalon, ø 38.1 mm x 4 mm
E-Ge-12.7-25.4	Germanium etalon, ø 12.7 mm x 25.4 mm (ø 0.5" x 1")

Using Ge etalon in gas sensing project involving quantum cascade lasers

Jagadeeshwari (Esha) Manne, PhD student, University of Alberta

Project: Infrared absorption spectroscopy with Quantum cascade laser.

The advance of Quantum cascade (QC) lasers fabricated by band structure engineering offers an attractive new option for IR absorption spectroscopy. QC-DFB lasers are of particular interest to gas-sensing applications because they emit single frequency radiation which falls within the 3-15 um window, where the fundamental absorption bands of most of the molecules are located.

Research Activities:

QC laser characterization
Exploring different strategies for trace gas detection and comparing the detection limits and sensitivity for open-path measurements.

I am a graduate student pursuing my doctoral studies at the University of Alberta. The Ge- etalon will be used for non-profit research here at the university. I am presently working on a gas sensing project involving Quantum cascade laser.

The mid-IR region is ideally suited for absorption spectroscopy since the fundamental vibrational transitions of a number of molecules lie here. Quantum cascade (QC) lasers fabricated by band structure engineering offer an attractive new option for sensitive IR absorption spectroscopy. Distributed feed-back pulsed QC lasers are of particular interest for they allow the realization of a room temperature, compact IR source with relatively high output power. In particular, their combination with the pulsed-CRDS techniquehas the potential for high sensitivity trace gas analysis. The goal of our present work is to develop a technique for quantitative online analysis of trace constituents in exhaled breath. We are using pulsed-CRDS technique in combination with a mid IR QC laser operating near 970 cm^-1to measure ammonia levels in exhaled breath. An unlocked ring-down cavity was designed for these studies which can be operated at atmospheric or reduced pressure. We have already attained a detection limit of 25 ppb for ammonia. We are in a process of improving the system to get down to sub ppb levels with this technique.

The etalon will be used for characterization of the laser which would be an important step in choosing the right parameters for the laser for gas-sensing applications.

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Del Mar Photonics featured components

Del Mar Photonics continuously expands its components portfolio.

Solar 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.

hexagonal light pipes, optical rods

Axicon Lens
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 prisms 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
	Vacuum viewport 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 - ITO - DLC (Diamond like coating) more details - request a quote
	Hydrogen 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 conditions. Applications: - radars - 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. Applications: - 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
Skype: delmarphotonics
sales@dmphotonics.com