# Acoustic-optic Q-switched cavityless weak-feedback laser based on Nd:GdVO4 bounce geometry

## TL;DR

This paper demonstrates a novel cavityless weak-feedback laser using Nd:GdVO4 with high repetition rate and short pulses, supported by a new theoretical model validated through experiments and simulations.

## Contribution

It introduces the first theory for Q-switched cavityless weak-feedback lasers, enabling analysis of short pulses near the round-trip time, and validates it with experimental and simulation results.

## Key findings

- Repetition rate up to 500 kHz achieved
- Pulse width of 5.2 ns at 100 kHz
- Theory accurately predicts experimental outcomes

## Abstract

An AOQ (acoustic-optic Q-switched) laser with cavityless weak-feedback configuration is demonstrated based on a Nd:GdVO4 bounce geometry. The laser can operate at a repetition up to 500 kHz with the output power above 4W. The pulse-width at 100 kHz reaches 5.2 ns, which is 4.3 times the round-trip time. A theory of Q-switched cavityless weak-feedback laser is proposed for the first time, to our best knowledge. This theory is very suitable for analyzing short pulses comparable to round-trip time. By utilizing the theory, simulation is implemented for our experimental conditions. The consistence between the simulation and the experimental results proves the validity of our theory.

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Source: https://tomesphere.com/paper/1904.04967