A femtosecond diode-pumped mode-locked laser operating at 8.2 MHz repetition rate has been demonstrated. The cavity was extended with a White cell configuration consisting of three concave mirrors of the same radius of curvature. The laser produced 126 fs long pulses with a 10% output coupler. The corresponding pulse energy was 52 nJ and peak power reached 416 kW. To the best of our knowledge, this is the lowest repetition rate Yb-ion laser operating in the 100 fs level regime.
We have demonstrated a diode-pumped Yb:CALGO laser operating at 13.85 MHz repetition rate with high pulse energy and high peak power. The laser delivered 750 mW of output power at 21 W of incident pump power. The shortest pulses obtained were 73 fs using a 15% output coupler. The corresponding pulse energy was 54 nJ and the peak power was 744 kW. A White cell configuration was used to extend the laser cavity. To the best of our knowledge, this is the first ever femtosecond laser operated with a White cell configuration.
A diode-pumped femtosecond laser oscillator producing <100 fs pulses with high pulse energy was demonstrated. The laser was based on the Yb:CALGO crystal and produced 91 fs pulses with 750 mW of average output power. The laser operated at 27 MHz and produced pulses with 28 nJ of energy corresponding to >300 kW of peak power. Such a high peak power performance with <100 fs pulses make this source an excellent platform for fluorescence lifetime imaging, supercontinuum generation, multiphoton imaging or seeding of amplifiers.
A high power conical refraction (CR) laser was demonstrated based on Yb:CALGO laser crystal with a separate intracavity CR element. The CR laser delivered the maximum output power of 6.25 W at 25 W of incident pump power which is the highest output power for the CR lasers to date. The separation of the CR element from the laser gain medium reduced the complexity of laser pumping. The generated CR laser beam exhibited excellent quality with well-resolved concentric rings and the Poggendorff dark ring.
A continuous-wave dual-wavelength Yb:CALGO laser has been demonstrated using a 12-mm thick off-surface axis birefringent filter. The obtained wavelength spacing could be tuned from a few nm up to tens of nm. In the experiments ~7.5 W of output power was obtained for 25 W of the incident pump power.
Demonstration of intracavity loss measurement in a diode-pumped continuous-wave Yb:CALGO laser is presented. The characterization method was based on spectroscopic gain measurements and allowed accurate and reliable determination of intracavity losses above the laser threshold. A comparison with traditional Findlay-Clay analysis was also made and highlighted the advantages of the spectroscopic method.
An optimized design of a birefringent filter with an off-plane optical axis is presented to enable multi-wavelength operation of diode-pumped Yb-ion solid-state lasers. The simulation results indicate that such birefringent filters can be used for the development of powerful tunable multi-wavelength Yb-ion laser sources. A comparison with performance of a standard birefringent filter that has its optical axis lying in plane of a plate is also given.
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