Passively Q-switched LED-pumped Ce: Nd:YAG laser

Tarkashvand, M; Farahbod, Amir Hossein; Hashemizadeh, Seyed Ali

doi:10.29252/ijpr.18.3.477

Cited by 3 publications

(5 citation statements)

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“…The optical resonator is a low loss stable resonator [4][5][6]. Therefore, to achieve the laser oscillation and high resonator stability, the geometrical length of the resonator is chosen as low as possible to reduce the diffraction loss and resonator misalignment sensitivity.…”

Section: Methodsmentioning

confidence: 99%

“…EJ  is approximately one order of magnitudes lower than the laser free-running. Comparison of the free-running laser spikes with the Qswitched pulses and including the attenuation factor of optical filters, indicates that the laser peak power increased by one order of magnitude [6].…”

Section: Experimental Findingsmentioning

confidence: 99%

“…The paper mainly presents the experimental observations and analysis of mode structure and time behavior of a LED-pumped Ce:Nd:YAG laser [5], [6]. The geometrical configuration of the LED sources and the optical resonator are similar to Refs.…”

Section: Introductionmentioning

confidence: 99%

“…The geometrical configuration of the LED sources and the optical resonator are similar to Refs. [4]- [6]. The high absorption of pumping radiations by the active medium, and the presence of passive Q-switch, results in a nearly Gaussian mode profile.…”

Section: Introductionmentioning

confidence: 99%

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Study of the Spatiotemporal Behavior of LED-Pumped Ce:Nd:YAG Laser

Tarkashvand

Farahbod

Hashemizadeh

2020

IJOP

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In this paper, the mode structure and time behavior of a LED-pumped Ce:Nd:YAG laser have been studied. Four blue LED bars with total 128 LEDs at 460 nm are utilized to pump a 3 mm diameter laser rod. Using a Cr 4+ :YAG passive optical switch with 96% initial transmission, and a low loss stable optical resonator and 0.7 J pumping energy, a single 17 micro-joules Q-switched laser pulse with 240 ns pulse-width and nearly TEM 00 mode profile was produced. By increasing the pumping energy E p up to 0.8 J, the mode structure remained intact. Further increasing of E p , the laser mode changed to TEM 10 . Numerical calculations show that the central high gain area of the laser rod and saturation mechanism of the passive Q-switch behaves like as a soft aperture to enforce the laser resonator to oscillate on a low order transverse mode. For laser free-running, the TEM 00 mode has not been achieved and the optical resonator produced high order transverse mode patterns.

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Section: Methodsmentioning

confidence: 99%

Section: Experimental Findingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study of the Spatiotemporal Behavior of LED-Pumped Ce:Nd:YAG Laser

Tarkashvand

Farahbod

Hashemizadeh

2020

IJOP

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“…[10] And based on the absorption band of Ce 3+ centred at 460 nm, Nd,Ce:YAG [11] and Ce:YAG [12] were pumped by blue LEDs. In addition, passive [13,14] and active Q-switched [15,16] laser demonstrations were also available. However, due to the limitation of LED Lambertian emission, as a pump source, the work efficiency is still inefficient compared with laser diodes (LDs).…”

Section: Introductionmentioning

confidence: 99%

Continuous wave and active Q-switched operation of Watt-level LED-pumped two-rod Nd,Ce:YAG laser

Shen 沈,

Lu 芦,

Xu 徐

et al. 2024

Chinese Phys. B

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In this paper, we demonstrated a high-performance LED-side-pumped two-rod Nd,Ce:YAG laser with continuous-wave (CW) and acousto-optical (A-O) Q-switched operation. A symmetrical shaped flat-flat cavity with two identical LED-side-pumped laser modules was employed for power scalability. In the CW regime, the maximum output average power of laser at 1064 nm was 4.41 W, corresponding to the highest optical conversion efficiency of 5.3% and a slope efficiency of 12.4%. In the active Q-switched regime, the pulse energy of laser was as high as 0.89 mJ at a repetition rate of 800 Hz with a pulse width of 457.2 ns, corresponding to the highest peak output power was 1.94 kW and the M2 factor was measured to be about 8.8. To the best of our knowledge, this is the first demonstration and the highest performance of an CW LED-side-pumped two-rod laser Nd,Ce:YAG with watt-level output reported so far.

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