Publication

Milliwatt-level on-chip green light source via second-harmonic generation in silicon nitride microresonators

2025

Abstract

On-chip green laser sources are essential for integrated photonic circuits and quantum technologies, particularly to address the “green gap” in semiconductor lasers [1]. Frequency-conversion-based green light generation methods such as third-harmonic generation, optical parametric oscillation, and second-harmonic generation (SHG), have shown great progress in the last few years, although the output power is still limited mainly due to low efficiency or low damage threshold.

Official source

Graph Chat

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

2025

Abstract

Official source

Related concepts (24)

Second-harmonic generation

Second-harmonic generation (SHG, also called frequency doubling) is a nonlinear optical process in which two photons with the same frequency interact with a nonlinear material, are "combined", and generate a new photon with twice the energy of the initial photons (equivalently, twice the frequency and half the wavelength), that conserves the coherence of the excitation. It is a special case of sum-frequency generation (2 photons), and more generally of harmonic generation.

High harmonic generation

High harmonic generation (HHG) is a non-linear process during which a target (gas, plasma, solid or liquid sample) is illuminated by an intense laser pulse. Under such conditions, the sample will emit the high harmonics of the generation beam (above the fifth harmonic). Due to the coherent nature of the process, high harmonics generation is a prerequisite of attosecond physics. Perturbative harmonic generation is a process whereby laser light of frequency ω and photon energy ħω can be used to generate new frequencies of light.

Laser

A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word laser is an anacronym that originated as an acronym for light amplification by stimulated emission of radiation. The first laser was built in 1960 by Theodore Maiman at Hughes Research Laboratories, based on theoretical work by Charles H. Townes and Arthur Leonard Schawlow. A laser differs from other sources of light in that it emits light that is coherent.

Related publications (13)

Milliwatt-level on-chip green light source via second-harmonic generation in silicon nitride microresonators

Chat with Graph Search

Optical Degradation of 845 nm VCSELs with Different Oxide Apertures for Silicon Photonics

Sputtered aluminum nitride-on-insulator for scalable integrated photonics

Femtosecond self-diffraction as a measure of the nonlinear response spectrum