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Raman Spectroscopy Instrumentation: Overview

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...

Raman Spectroscopy: Overview

Raman Spectroscopy: Overview

The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...

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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

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Highly efficient solid-state Raman yellow-orange lasers created by enhancing the cavity reflectivity.

Y F Chen, D Li, Y M Lee

|February 12, 2021

Summary

This summary is machine-generated.

A novel output coupler enhances cavity reflectivity, significantly boosting power and efficiency in diode-pumped neodymium-doped gadolinium vanadate (Nd:GdVO4)/KGW Raman lasers. This advancement increases conversion efficiency and maximum output power for yellow and orange laser applications.

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Area of Science:

Optics and Photonics
Laser Physics
Materials Science

Background:

Diode-pumped solid-state lasers are crucial for various applications.
Neodymium-doped gadolinium vanadate (Nd:GdVO4) and KGW crystals are effective laser gain media.
Improving output power and efficiency in Raman lasers remains a key research area.

Purpose of the Study:

To propose and demonstrate a new output coupler (OC) design for enhanced cavity reflectivity.
To significantly elevate output powers and efficiencies of diode-pumped Nd:GdVO4/KGW Raman yellow-orange lasers.
To investigate the impact of double-sided dichroic coating on OC performance.

Main Methods:

Development of a novel output coupler (OC) featuring double-sided dichroic coating.
Integration of the new OC into diode-pumped Nd:GdVO4/KGW Raman laser systems.
Experimental comparison of laser performance with the new OC versus conventional single-sided coated OCs.

Main Results:

The double-sided dichroic coating effectively increased cavity reflectivity.
For a yellow laser (578.8 nm), conversion efficiency improved from 15% to 26.3%.
Maximum output power for the yellow laser increased from 5.7 W to 10.5 W (quasi-continuous-wave).
Maximum output power for an orange laser (588 nm) improved from 5.6 W to 7.0 W.

Conclusions:

The proposed output coupler with enhanced cavity reflectivity significantly boosts output power and efficiency.
Double-sided dichroic coating is an effective strategy for improving Nd:GdVO4/KGW Raman yellow-orange lasers.
This advancement offers a promising solution for high-power yellow and orange laser generation.