Journal
APPLIED SCIENCES-BASEL
Volume 12, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/app12094727
Keywords
Ti; sapphire laser; amplifier; injection-lock; diode pumping; solid state laser
Categories
Funding
- JSPS [19H05584]
- Japan Science and Technology Agency (JST) PRESTO [JPMJPR19G7]
- JST SCORE University Promotion Type (Developing the Environment for Creation of Startup Ecosystem in Startup Cities Type) [JPMJST2076]
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This study demonstrates a compact system that integrates a continuous wave oscillator and a pulsed amplifier into a single optical cavity. By combining blue and green wavelengths, the Ti:sapphire crystal is simultaneously excited by continuous wave and pulsed pump sources, resulting in high peak pulse intensity and narrow spectral linewidth.
A wide variety of applications require high peak laser intensity in conjunction with a narrow spectral linewidth. Typically, injection-locked amplifiers have been employed for this purpose, where a continuous wave oscillator is amplified in a secondary external resonant amplifier cavity using a pulsed pump laser. In contrast, here we demonstrate a setup that combines a CW Ti:sapphire oscillator and pulsed amplifier in a single optical cavity, resulting in a compact system. Dichroic beam combination of blue wavelength semiconductor diodes and the green wavelength of a Nd:YAG laser allowed the simultaneous excitation of the Ti:sapphire crystal by both continuous wave and pulsed pump sources. A linewidth of <2 MHz is achieved in continuous wave operation, while the linewidth increases to about 10 MHz in the combined CW+pulsed mode with a pulse duration of 73 ns. A peak pulse intensity of 0.2 kW is achieved, which should enable efficient single-pass second harmonic generation in a nonlinear crystal.
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