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Nonlinearly coupled, gain-switched Nd:YAG second harmonic laser with variable pulse width.

Aniruddha Ray¹, Susanta K Das, Lokanath Mishra

¹Department of Physics and Meteorology, IIT Kharagpur, West Bengal 721 302, India.

|February 3, 2009

Summary

A novel all-solid-state green laser was developed using a diode-pumped Nd:YAG laser and KTP crystal. This simple, gain-switched laser produces nanosecond pulses suitable for applications like eye surgery and micromachining.

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Area of Science:

Lasers and Photonics
Nonlinear Optics

Background:

All-solid-state lasers are crucial for various scientific and industrial applications.
Developing efficient green lasers with nanosecond pulse durations is an ongoing research area.
Frequency doubling techniques are essential for generating shorter wavelength laser light.

Purpose of the Study:

To develop an all-solid-state, gain-switched green laser.
To investigate the effect of nonlinear coupling on the fundamental pulse width.
To demonstrate a simple and efficient method for generating nanosecond green laser pulses.

Main Methods:

Utilized a side diode-array pumped Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) laser.
Employed a Potassium Titanyl Phosphate (KTiOPO4) (KTP) crystal as an intracavity frequency doubler.

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Studied nonlinear coupling effects on pulse width and compared with experimental measurements.

Main Results:

Achieved a peak power of 40 W at 532 nm with a pulse width of 409 ns.
Demonstrated good agreement between theoretical predictions and experimental measurements of pulse width.
Obtained stable green laser output with a relatively simple setup.

Conclusions:

The developed gain-switched green laser offers a simple alternative to Q-switched lasers.
The laser system is suitable for applications requiring longer nanosecond pulses.
Potential applications include eye surgery, micromachining, and underwater communication.