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MOSFET Amplifiers

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The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...

BJT Amplifiers

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Design Example: Capacitance Multiplier Circuit

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Related Experiment Video

Updated: Jul 9, 2026

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

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Published on: July 12, 2017

Kilohertz Cr:forsterite regenerative amplifier.

J M Evans, V Petri Evi, R R Alfano

|December 20, 2007

Summary

This summary is machine-generated.

We developed a tunable regenerative amplifier using Cr:forsterite for near-infrared laser pulses. This system achieves 150 fs pulse durations and significant amplification, enabling new possibilities in ultrafast optics.

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Area of Science:

Laser Physics
Ultrafast Optics
Materials Science

Background:

Regenerative amplifiers are crucial for generating high-energy ultrashort laser pulses.
Cr:forsterite is a promising vibronic laser material for near-infrared applications.
Chirped-pulse amplification (CPA) is a key technique for amplifying femtosecond pulses without damaging the gain medium.

Purpose of the Study:

To demonstrate a tunable regenerative amplifier operating in the near-infrared (NIR) region.
To investigate the performance of Cr:forsterite as a gain medium in a regenerative amplifier setup.
To achieve high pulse energy and short pulse durations using CPA.

Main Methods:

Utilized a Cr:forsterite crystal as the gain medium.
Employed the chirped-pulse amplification (CPA) technique.
Implemented a second-harmonic generator (SHG) for wavelength conversion.

Main Results:

Achieved tunable operation from 1230 to 1280 nm.
Generated pulses as short as 150 fs at 1255 nm with a 1 kHz repetition rate.
Observed pulse amplification exceeding 5 x 10^5 times, yielding 34 μJ output energy.
Produced 110 fs pulses with 7 μJ energy at 625 nm after SHG.

Conclusions:

The Cr:forsterite regenerative amplifier is a viable system for generating tunable NIR ultrashort pulses.
The demonstrated CPA technique enables high amplification factors and short pulse durations.
The system's capability for wavelength conversion opens avenues for further applications in nonlinear optics and spectroscopy.