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Injection-seeded titanium-doped-sapphire laser.

T D Raymond, A V Smith

|September 24, 2009

Summary

This summary is machine-generated.

We show how to seed a titanium-doped-sapphire laser with low-power continuous-wave lasers. This method efficiently produces high-energy, narrow-bandwidth laser pulses with precise wavelength control.

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Area of Science:

Laser physics
Quantum optics
Spectroscopy

Background:

Pulsed lasers, particularly titanium-doped-sapphire (Ti:Sapph) lasers, are crucial for various scientific applications.
Achieving narrow bandwidth and precise wavelength control in pulsed Ti:Sapph lasers can be challenging.
Injection seeding offers a potential method to improve laser performance.

Purpose of the Study:

To demonstrate the effectiveness of injection seeding for a pulsed Ti:Sapph ring laser.
To determine the minimum seed power required for successful seeding.
To characterize the output properties of the seeded laser.

Main Methods:

Utilizing continuous-wave (CW) dye and diode lasers as seed sources.
Employing a pulsed laser-pumped Ti:Sapph ring laser.

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Published on: June 6, 2025

Measuring output energy, pulse duration, bandwidth, and wavelength purity using diagnostic tools, including an atomic resonance filter.

Main Results:

Successful injection seeding was achieved with as little as 100 microwatts (µW) of seed power.
The seeded laser produced 4 millijoules (mJ) of energy in a 30-nanosecond (nsec) pulse.
The output exhibited a TEM(00) spatial mode and a bandwidth narrower than 25 MHz Full Width at Half Maximum (FWHM).
An atomic resonance filter confirmed that over 99.9% of the output energy was at the seed wavelength (780 nm).

Conclusions:

Injection seeding is a highly effective technique for controlling the output of pulsed Ti:Sapph lasers.
Low seed power is sufficient for achieving high-quality laser output.
Understanding spatial and longitudinal mode-matching is critical for optimizing the injection seeding process.