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Related Experiment Video

Updated: Jan 14, 2026

In Vivo CRISPR/Cas9 Screening to Simultaneously Evaluate Gene Function in Mouse Skin and Oral Cavity
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Raman injection laser.

Mariano Troccoli1, Alexey Belyanin, Federico Capasso

  • 1Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA. troccoli@deas.harvard.edu

Nature
|February 25, 2005
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel semiconductor injection Raman laser. This electrically driven device eliminates the need for external pumps, significantly boosting Raman gain for compact infrared light sources.

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Area of Science:

  • Nonlinear optics
  • Semiconductor lasers
  • Infrared photonics

Background:

  • Stimulated Raman scattering (SRS) enables tunable light sources but typically requires powerful external laser pumping.
  • Existing Raman lasers suffer from low gain, limiting practical applications.
  • Quantum cascade lasers (QCLs) offer electrical pumping and optical gain in the mid-infrared.

Purpose of the Study:

  • To develop a semiconductor injection Raman laser that overcomes the limitations of traditional Raman sources.
  • To achieve high Raman gain and efficiency without external optical pumping.
  • To create compact, wavelength-agile mid- and far-infrared light sources.

Main Methods:

  • Utilized triply resonant stimulated Raman scattering within the active region of a quantum cascade laser.
  • Integrated the quantum cascade laser as an internal optical pump, enabling electrical driving.
  • Demonstrated a semiconductor injection Raman laser operating without external laser pumping.

Main Results:

  • Achieved orders of magnitude enhancement in Raman gain compared to conventional Raman lasers.
  • Demonstrated high conversion efficiency and a low threshold for laser operation.
  • Successfully realized an electrically driven, compact Raman laser source.

Conclusions:

  • The developed semiconductor injection Raman laser offers a significant advancement over existing technologies.
  • This device circumvents the need for external laser pumping, simplifying operation and reducing size.
  • It paves the way for a new generation of compact, tunable, and efficient mid- and far-infrared semiconductor light sources.