Tanant Waritanant

We have demonstrated the highest conical refraction (CR) laser output power to date by placing a CR crystal inside of a diode-pumped Nd:YVO laser cavity. The CR crystal did not have a significant influence on laser output power as well as efficiency. The CR laser produced the maximum output power of 3.68 W with the slope efficiency of 42 % and opti...

We report on the thermal lensing effect study in a 1063-nm Nd:GdVO4 laser with in-band diode pumping at 912 nm. The thermal lensing focal power was determined using the experimentally measured values of the laser beam width and beam quality factor (M²). The maximum observed thermal lens dioptric power was 9 m⁻¹ at 11.3 W of output power (18.87 W of...

Two dual-wavelength operation regimes of a diode-pumped Nd:YVO4 laser were demonstrated at 1064.1 & 1073.1 and 1064.1 & 1085.3 nm with two intracavity birefringent plates. The output power ratio of the dual-wavelength output could be freely adjusted. The highest total output power was 1.44 W under the dual-wavelength condition with 1:1 power ratio...

Discrete multi-wavelength operation of a diode-pumped Nd:GdVO4 laser at four different wavelengths was demonstrated using a single birefringent filter plate. The laser achieved maximum output powers of 5.92 W, 5.66 W, 5.56 W and 3.98 W at 1063.2 nm, 1070.8 nm, 1082.5 nm and 1086.2 nm wavelengths, respectively. To the best of our knowledge, apart fr...

We report on the first semiconductor saturable absorber mirror mode-locked Nd:GdVO4 laser directly diode-pumped at 912 nm. The laser generated 10.14 W of averaged output power at 1063 nm with the pulse width of 16 ps at the repetition rate of 85.2 MHz. The optical-to-optical efficiency and slope efficiency in the mode-locked regime were calculated...

We report on a semiconductor saturable absorber mirror mode-locked Nd : YVO 4 laser operating at discretely selectable 1064.0, 1073.0, 1085.1 nm wavelengths with the average output powers of more than 2.2 W at each of the three wavelengths. The optical-to-optical efficiencies and the slope efficiencies were larger than 19% and 29% for each of the t...

We report on the performance of a continuous-wave Nd:GdVO4 laser in-band diode-pumped at 912 nm with high output power and excellent beam quality. The laser produced an output power of 19.8Wat 1063 nm with an optical efficiency of 59.3% and slope efficiency of 62.7%. The laser threshold was ∼2.04 W of the absorbed pump power, and the laser output b...

Selectable and discretely tunable multi-wavelength diode-pumped Nd : YVO 4 laser operating at 1064.0, 1073.1, and 1085.2 nm was demonstrated using a single intracavity birefringent plate. Under 11.2 W of absorbed pump power, the maximum output power of more than 3.8 W for any of the three wavelengths was achieved with slope and optical-to-optical e...

Passive mode locking of a Nd:KGW laser with hot-band diode pumping at 910 nm was demonstrated. A semiconductor saturable absorber mirror was used as a mode locking mechanism. The laser generated 2.4 ps pulses at a repetition rate of ~83.8 MHz. An average output power of 87 mW was obtained at 1067 nm. To the best of our knowledge, this is the first...

We have demonstrated what we believe is the first continuous wave neodymium-doped potassium gadolinium tungstate crystal (Nd:KGW) laser with hot-band diode pumping at ∼ 910 nm . This pumping wavelength reduced the quantum defect by > 46 % as compared to conventional ∼ 810 nm pumping and resulted in significantly lower thermal lensing. The laser pro...

We report on the performance of a semiconductor saturable absorber mirror passively mode-locked Nd:YVO4 laser with in-band pumping at 914 nm and with the highest slope efficiency to date among the mode-locked Nd-lasers. The laser produced 6.7 W of output power with repetition rate of 87 MHz and pulse duration of 16 ps. The slope efficiency of 77.1%...

We report on the performance of a semiconductor saturable absorber mirror passively mode-locked Nd:YVO₄ laser with in-band pumping at 914 nm and with the highest slope efficiency to date among the mode-locked Nd-lasers. The laser produced 6.7 W of output power with repetition rate of 87 MHz and pulse duration of 16 ps. The slope efficien...

Thermal lensing in an Nd:YVO4 laser system operating at 1064 nm with in-band pumping at 914 nm was characterized. The focal length of the thermal lens in the crystal was calculated using ABCD matrix formalism from the experimental data of the output beam diameter measurements made at different output power levels. The determined focal lengths of th...

We demonstrate passive mode locking of a Nd:KGd(WO 4 ) 2 laser diode-pumped at 910 nm. Semiconductor saturable absorber mirror was used to generate 2.4 ps pulses at a repetition rate of 83.8 MHz. An output power of 87 mW was obtained at 1067 nm.

A passively mode-locked Nd:YVO4 laser with the highest to date slope efficiency of 77.1% was demonstrated with in-band pumping at 914 nm. The laser produced 6.7 W of output power with 17 ps long pulses.

We have demonstrated what we believe is the first continuous wave Nd:KGW laser with hot band diode pumping at ~910 nm. The laser produced 2.9 W of average output power in a diffraction limited beam.

Two dual-wavelength operations of diode-pumped Nd:YVO4 laser were demonstrated at 1064.1 & 1073.1 and 1064.1 & 1085.3 nm with two intracavity birefringent plates. The output power ratio of the dual-wavelength output could be freely adjusted.

Thermal lensing in Nd:YVO4 laser with in-band pumping at 914nm was experimentally characterized. An FEA modeling showed excellent agreement. A comparison with other standard pumping wavelengths was also made, highlighting a factor of 3 difference.

This paper proposes a novel design for a high angular tolerance thin profile solar concentrator comprised of a wedge prism and diffraction gratings. A concentrated broad solar spectrum of up to 500 nm can be achieved by utilizing two diffraction gratings located on the top and bottom surfaces of the wedge prism. The gratings diffract the incident l...

A laser system with low output power using a volume Bragg grating (VBG) of photothermal refractive glass and of high diffraction efficiency (0.994) as one of the end mirrors is demonstrated. The minute absorption of the VBG causes changes in various aspects of the laser performance including laser output power, shifting of laser wavelength, chirped...

Solar concentrators using wedge prism with diffractive grating or sawtooth profile mirror are proposed and studied. The concentrator length-to-thickness ratio can exceed 6 and the maximum concentration ratios exceed 3.5 for these designs.

A series of simulations and experiments were performed and confirmed minute self-absorption of volume Bragg grating (VBG) will influence the VBG reflection spectrum as it works as a laser mirror even for low power laser.

A simulation using T-matrix and finite element analysis confirm the experimental results and suggest VBG laser wavelength and reflectivity change caused by the volume Bragg grating absorption induced thermal effects.