A High Pulse Repetition Frequencies (PRF) Narrow Pulse Nd:YAG lAser Using An Improved Pulse Transmission Mode (PTM) Modulation Technique

E.Michael Ward

doi:10.1117/12.959390

31 October 1980 A High Pulse Repetition Frequencies (PRF) Narrow Pulse Nd:YAG lAser Using An Improved Pulse Transmission Mode (PTM) Modulation Technique

E.Michael Ward

Author Affiliations +

Proceedings Volume 0247, Advances in Laser Engineering and Applications; (1980) https://doi.org/10.1117/12.959390
Event: 24th Annual Technical Symposium, 1980, San Diego, United States

Abstract

The electro-optical (E-0) community has long sought a neodymium doped yttrium aluminum garnet (Nd:YAG) laser system that provides short duration pulses and high peak powers at repetition frequencies in excess of 10 kilohertz (kHz). Previous attempts to develop such a laser implemented Pulse Transmission Mode (PTM) modulation using E-0 modulators. Because of insertion loses, these modulators were adversely affected by high average powers. A new approach to implementing the PTM technique has been investigated using a combination of an Acousto-Optic (A-0) and a Frustrated Total Internal Reflectance (FTIR) modulator. These devices were selected because their operation is independent of the direction of polarization of the laser energy and they provide a low insertion loss. The new PTM configuration provided significant increases in peak power and a reduction in pulsewidth in comparison to conventional A-0 Q-switching. Preliminary laboratory tests indicated that, if the FTIR can be optimized for PTM operation, narrow pulsewidths at high pulse repetition frequencies (PRF) can be obtained from an Nd:YAG resonator.

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E.Michael Ward "A High Pulse Repetition Frequencies (PRF) Narrow Pulse Nd:YAG lAser Using An Improved Pulse Transmission Mode (PTM) Modulation Technique", Proc. SPIE 0247, Advances in Laser Engineering and Applications, (31 October 1980); https://doi.org/10.1117/12.959390

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KEYWORDS

Modulators

FT-IR spectroscopy

Resonators

Interferometers

Modulation

Nd:YAG lasers

Pulsed laser operation

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