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Diode: Forward bias

Diode: Forward bias

In semiconductor devices, diodes play a crucial role in directing current flow, and its operation is primarily categorized into forward bias and reverse bias. A diode is said to be forward-biased when its p-type region is connected to the positive terminal of a battery and its n-type region is linked to the negative terminal. This configuration reduces the potential barrier within the diode, allowing current to flow easily from the p to the n-type region.
The behavior of a diode in forward bias...

Diode: Reverse bias

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A diode is reverse-biased when the positive terminal of an external voltage source is connected to the n-type material and the negative terminal to the p-type material. This configuration opposes the natural direction of current flow through the diode, effectively increasing the width of the depletion region and the barrier potential. The reverse bias condition produces a minimal leakage current, primarily due to minority charge carriers. This leakage becomes significant when the reverse...

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

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Self-starting additive-pulse mode-locked diode-pumped Nd:YAG laser.

J Goodberlet, J Jacobson, J G Fujimoto

|September 22, 2009

Summary

A diode-pumped neodymium-doped yttrium aluminum garnet (Nd:YAG) laser was developed using additive-pulse mode locking. This laser generates ultrashort pulses without active modulation, offering a simpler design for laser applications.

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Area of Science:

Optics and Photonics
Laser Physics

Background:

Diode-pumped solid-state lasers are crucial for various applications.
Mode-locking techniques are essential for generating ultrashort laser pulses.

Purpose of the Study:

To demonstrate a diode-pumped Nd:YAG laser using self-starting additive-pulse mode locking.
To investigate the performance and design considerations of this laser system.

Main Methods:

Utilized a nonlinear external cavity for additive-pulse mode locking.
Employed a diode-pumped neodymium-doped yttrium aluminum garnet (Nd:YAG) gain medium.

Main Results:

Achieved stable, self-starting mode locking.
Generated laser pulses with a duration of 1.7 picoseconds.
Obtained an average output power of 25 milliwatts.

Conclusions:

Additive-pulse mode locking in a nonlinear external cavity is an effective method for diode-pumped Nd:YAG lasers.
The demonstrated system operates without active amplitude or phase modulation, simplifying the design.
Design and scaling aspects of this technology warrant further investigation for broader applications.