Abstract
A continuously tunable titanium:sapphire (Ti:Sa) laser self-seeded by an extended grating cavity was demonstrated and characterized. By inserting a partially reflecting mirror inside the cavity of a classic single-cavity grating laser, two oscillators are created: a broadband power oscillator and a narrowband oscillator with a prism beam expander and a diffraction grating in Littrow configuration. By coupling the grating cavity oscillation into the power oscillator, a power-enhanced narrow-linewidth laser oscillation is achieved. Compared to the classic grating laser, this simple modification significantly increases the laser output power without considerably broadening the linewidth. With most of the oscillating laser power confined inside the broadband power cavity and lower power incident onto the grating, the new configuration also allows higher pump power, which is typically limited by the thermal deformation of the grating coating at high oscillation power.
Highlights
A nanosecond pulsed Ti:Sa laser with broadly tunable wavelength range, single-longitudinal-mode operation and high peak power, is a powerful tool used for scientific researches and applications, such as resonance laser ionization spectroscopy [1,2], laser isotope separation [3,4], non-linear optical process [5] and Light Detection and Ranging (LiDAR) [6]
The experimental setup was based on a grating-tuned Ti:Sa laser previously laboratory-built by our group [14], which is regularly used for in-source laser resonance ionization spectroscopy of short lived isotopes [15]
The F-P cavity alone gives a BB laser emission of 1.65 W, which was measured by putting an optical opaque blocker between the prism set and the partial reflection (PR) mirror
Summary
A nanosecond pulsed Ti:Sa laser with broadly tunable wavelength range, single-longitudinal-mode operation and high peak power, is a powerful tool used for scientific researches and applications, such as resonance laser ionization spectroscopy [1,2], laser isotope separation [3,4], non-linear optical process [5] and Light Detection and Ranging (LiDAR) [6]. Wavelength selection for this type of Ti:Sa laser is typically realized by use of a birefringent filter (BRF) or a diffraction grating. This allows for smooth and continuous wavelength tuning and has been implemented in most tunable Ti:Sa laser systems employed for spectroscopy
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