Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no current...
Switching of BJT01:22

Switching of BJT

Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are reverse-biased. The...
Controlled-Current Coulometry: Overview01:27

Controlled-Current Coulometry: Overview

Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
MOSFET Amplifiers01:17

MOSFET Amplifiers

The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
MOSFET: Depletion Mode01:20

MOSFET: Depletion Mode

Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity arises...
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Accurate Measurement of the Optical Constants n and k for a Series of 57 Inorganic and Organic Liquids for Optical Modeling and Detection.

Applied spectroscopy·2017
Same author

EXPRESS: Accurate Measurement of the Optical Constants n and k for a Series of 57 Inorganic and Organic Liquids for Optical Modeling and Detection.

Applied spectroscopy·2017
Same author

Characterization of a swept external cavity quantum cascade laser for rapid broadband spectroscopy and sensing.

Optics express·2015
Same author

Precision control of multiple quantum cascade lasers for calibration systems.

The Review of scientific instruments·2014
Same author

Infrared near-field spectroscopy of trace explosives using an external cavity quantum cascade laser.

Optics express·2014
Same author

Real-time trace gas sensing of fluorocarbons using a swept-wavelength external cavity quantum cascade laser.

The Analyst·2014

Related Experiment Video

Updated: May 14, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Note: Switch-mode hybrid current controllers for quantum cascade lasers.

Matthew S Taubman1

  • 1Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, USA. Matthew.Taubman@pnnl.gov

The Review of Scientific Instruments
|February 8, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces a hybrid controller for quantum cascade lasers, reducing power demands for fieldable systems. The new design achieves low noise and high current modulation, improving mid-infrared chemical sensing technology.

More Related Videos

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
09:10

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Published on: April 24, 2014

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Related Experiment Videos

Last Updated: May 14, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
09:10

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Published on: April 24, 2014

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Area of Science:

  • Optoelectronics
  • Laser Technology
  • Chemical Sensing

Background:

  • Quantum cascade lasers (QCLs) have advanced mid-infrared chemical sensing.
  • High current and voltage requirements of QCLs limit the size, weight, and power (SWaP) of fieldable systems, especially in high temperatures.
  • Existing laser diode drivers are insufficient for demanding QCL applications.

Purpose of the Study:

  • To develop a novel hybrid controller for QCLs that addresses SWaP limitations.
  • To achieve low-noise and high-current drive capabilities for QCLs.
  • To enable more robust and portable mid-infrared sensing systems.

Main Methods:

  • A switch-mode/linear hybrid controller architecture was designed and implemented.
  • The controller was tested for drive current, compliance voltage, and output noise performance.
  • Current modulation capabilities were evaluated at various frequencies.

Main Results:

  • The hybrid controller provides drive currents up to 2 A at compliance voltages up to 15 V.
  • Output noise levels approach intrinsic limits (shot and Johnson noise) below 100 Hz.
  • Current modulation from near 0 to 1.8 A was demonstrated at frequencies up to 1 kHz.

Conclusions:

  • The developed hybrid controller effectively mitigates the power demands of QCLs.
  • This technology enables smaller, lighter, and more power-efficient fieldable systems for mid-infrared chemical sensing.
  • The low-noise and high-modulation performance enhances the applicability of QCLs in demanding environments.