Colorimetric Phosphate Detection Using Organic DFB Laser-Based Absorption Spectroscopy

A novel compact laser absorption spectrometer is developed for colorimetric detection. We demonstrate the realization of the system as well as example measurements of phosphate in water samples based on the malachite green (MG) method. A phosphate concentration range of to (which corresponds to a molar concentration range of to ) is investigated. This photometer demonstrates the ease of integration of organic distributed feedback (DFB) lasers and their miniaturizability, leading the way toward optofluidic on-chip absorption spectrometers. We constructed an optically pumped organic second-order DFB laser on a transparent substrate, including a transparent encapsulation layer, to have access to both emission directions of the surface-emitting laser. Using the two different surface emission directions of the laser resonator allows monitoring of the emitted light intensity without using additional optical elements. Based on these advances, it is possible to miniaturize the measurement setup of a laser absorption spectrometer and to measure analytes, such as phosphate.

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Operating characteristics of a tunable diode laser absorption spectrometer using short-external-cavity and DFB laser diodes

Applied Optics ◽

10.1364/ao.29.005007 ◽

1990 ◽

Vol 29 (33) ◽

pp. 5007 ◽

Cited By ~ 15

Author(s):

Brian F. Ventrudo ◽

Daniel T. Cassidy

Keyword(s):

Diode Laser ◽

Laser Diodes ◽

External Cavity ◽

Tunable Diode Laser ◽

Operating Characteristics ◽

Laser Absorption ◽

Dfb Laser ◽

Diode Laser Absorption ◽

Absorption Spectrometer

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Scintillation and multiwavelength coherence effects in a long-path laser absorption spectrometer

Applied Optics ◽

10.1364/ao.17.000277 ◽

1978 ◽

Vol 17 (2) ◽

pp. 277 ◽

Cited By ~ 36

Author(s):

A. G. Kjelaas ◽

P. E. Nordal ◽

A. Bjerkestrand

Keyword(s):

Laser Absorption ◽

Coherence Effects ◽

Absorption Spectrometer

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Interband Cascade Photonic Integrated Circuits on Native III-V Chip

Sensors ◽

10.3390/s21020599 ◽

2021 ◽

Vol 21 (2) ◽

pp. 599

Author(s):

Jerry R. Meyer ◽

Chul Soo Kim ◽

Mijin Kim ◽

Chadwick L. Canedy ◽

Charles D. Merritt ◽

...

Keyword(s):

Integrated Circuits ◽

Integrated Circuit ◽

Detection System ◽

Laser Cavity ◽

Building Blocks ◽

Drive Power ◽

Optical Elements ◽

Photonic Integrated Circuit ◽

Cleaved Facets ◽

On Chip

We describe how a midwave infrared photonic integrated circuit (PIC) that combines lasers, detectors, passive waveguides, and other optical elements may be constructed on the native GaSb substrate of an interband cascade laser (ICL) structure. The active and passive building blocks may be used, for example, to fabricate an on-chip chemical detection system with a passive sensing waveguide that evanescently couples to an ambient sample gas. A variety of highly compact architectures are described, some of which incorporate both the sensing waveguide and detector into a laser cavity defined by two high-reflectivity cleaved facets. We also describe an edge-emitting laser configuration that optimizes stability by minimizing parasitic feedback from external optical elements, and which can potentially operate with lower drive power than any mid-IR laser now available. While ICL-based PICs processed on GaSb serve to illustrate the various configurations, many of the proposed concepts apply equally to quantum-cascade-laser (QCL)-based PICs processed on InP, and PICs that integrate III-V lasers and detectors on silicon. With mature processing, it should become possible to mass-produce hundreds of individual PICs on the same chip which, when singulated, will realize chemical sensing by an extremely compact and inexpensive package.

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Subwavelength Optical Elements and Nanoimprint Technology for Optical System on Chip

2007 Digest of the IEEE/LEOS Summer Topical Meetings ◽

10.1109/leosst.2007.4288332 ◽

2007 ◽

Author(s):

Stephen Y. Chou

Keyword(s):

Optical System ◽

System On Chip ◽

Optical Elements ◽

On Chip

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Development of a tunable diode laser absorption spectrometer for measurements of the ratio in methane

Chemosphere ◽

10.1016/0045-6535(93)90409-x ◽

1993 ◽

Vol 26 (1-4) ◽

pp. 13-22 ◽

Cited By ~ 12

Author(s):

M. Schupp ◽

P. Bergamaschi ◽

G.W. Harris ◽

P.J. Crutzen

Keyword(s):

Diode Laser ◽

Tunable Diode Laser ◽

Laser Absorption ◽

Diode Laser Absorption ◽

Absorption Spectrometer

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Characterization of X-ray gas attenuator plasmas by optical emission and tunable laser absorption spectroscopies

Journal of Synchrotron Radiation ◽

10.1107/s1600577517012000 ◽

2017 ◽

Vol 24 (6) ◽

pp. 1195-1208 ◽

Cited By ~ 1

Author(s):

Álvaro Martín Ortega ◽

Ana Lacoste ◽

Stéphane Béchu ◽

Alexandre Bès ◽

Nader Sadeghi

Keyword(s):

Incident Beam ◽

Tunable Laser ◽

Optical Emission ◽

High Energy ◽

Beam Power ◽

Beam Path ◽

Optical Elements ◽

X Ray ◽

Laser Absorption ◽

X Ray Absorption

X-ray gas attenuators are used in high-energy synchrotron beamlines as high-pass filters to reduce the incident power on downstream optical elements. The absorption of the X-ray beam ionizes and heats up the gas, creating plasma around the beam path and hence temperature and density gradients between the center and the walls of the attenuator vessel. The objective of this work is to demonstrate experimentally the generation of plasma by the X-ray beam and to investigate its spatial distribution by measuring some of its parameters, simultaneously with the X-ray power absorption. The gases used in this study were argon and krypton between 13 and 530 mbar. The distribution of the 2pexcited states of both gases was measured using optical emission spectroscopy, and the density of argon metastable atoms in the 1s5state was deduced using tunable laser absorption spectroscopy. The amount of power absorbed was measured using calorimetry and X-ray transmission. The results showed a plasma confined around the X-ray beam path, its size determined mainly by the spatial dimensions of the X-ray beam and not by the absorbed power or the gas pressure. In addition, the X-ray absorption showed a hot central region at a temperature varying between 400 and 1100 K, depending on the incident beam power and on the gas used. The results show that the plasma generated by the X-ray beam plays an essential role in the X-ray absorption. Therefore, plasma processes must be taken into account in the design and modeling of gas attenuators.

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