High-radiance light sources with LED-pumped luminescent concentrators applied to pump Nd:YAG passively Q-switched laser

Pichon, Pierre; Barbet, Adrien; Blengino, D.; Legavre, P.; Gallinelli, Thomas; Druon, Frédéric; Blanchot, Jean-Philippe; Balembois, François; Forget, Sébastien; Chénais, Sébastien; Georges, Patrick

doi:10.1016/j.optlastec.2017.04.009

Cited by 18 publications

(17 citation statements)

References 12 publications

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“…A low FOM can be compensated for by obvious methods, like using multiple LEDs or brighter LEDs. A more advanced method for LED pumping of solid-state lasers employs luminescent concentrators [20]: recently, an output irradiance as high as 2.5 kW∕cm 2 was achieved [23]. With these methods at hand, it can be expected that the concept of LED-pumped WGR lasers can be successfully applied to a variety of other laser-active materials.…”

Section: Discussionmentioning

confidence: 99%

“…The continuing trend of LEDs to become more powerful will allow in the future for full-continuous-wave (cw) LED-pumped WGR lasers delivering several milliwatts of output power at low cost and with high reliability. Mirror-based LED-pumped bulk lasers have attracted much interest within recent years [18][19][20][21][22][23]. This report is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

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LED-pumped whispering-gallery laser

2017

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A low-cost light-emitting diode (LED) is sufficient to pump a quasi-continuous-wave bidirectional high-Q whispering-gallery resonator laser made of Nd:YVO₄. This is remarkable because of the very limited spatial and spectral coherence of an LED. The LED, delivering up to 3.5 W, centered around 810 nm, is turned on in intervals of 100 µs duration, and for these periods a laser output exceeding 0.8 mW has been verified. Furthermore, 0.1-s-long laser pulses are demonstrated. To the best of our knowledge this is the first demonstration of an LED-pumped high-Q whispering-gallery laser. The concept can be extended easily to other laser active materials. A prospect is also to pump several of such lasers with a single LED

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

LED-pumped whispering-gallery laser

2017

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“…The first LED-pumped concentrator was reported with Ce:YAG [18], quickly followed by demonstrations for digital projection [19][20][21][22] and light sources in the yellowish [23]. They have been used to pump Nd:doped lasers [18,24] and an alexandrite laser [25]. In this paper, we reported the first LED-pumped Ti:sapphire laser using Ce:LuAG concentrators, chosen for the spectral matching with the absorption band of Ti:sapphire ( Fig.…”

mentioning

confidence: 99%

“…1). The green light emitted in the concentrator is guided toward the edges of the concentrator via total internal reflections [18][19][20][21][22][23][24][25].…”

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confidence: 99%

Light-emitting diodes: a new paradigm for Ti:sapphire pumping

Pichon¹,

Barbet²,

Blanchot³

et al. 2018

Optica

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Ti:sapphire presents unequaled tuning properties. However, because of a short lifetime, the energy cannot be stored in Ti 3+ upper level which makes this gain medium difficult to pump. Hence, the size, price and complexity of femtosecond laser chains are partially driven by their pump source. We present a novel concept to pump Ti:Sapphire based on light-emitting diodes (LEDs) which gathers ruggedness, compactness, simplicity and low price. Combining LEDs and a Ce:LuAG luminescent concentrator, we report the first LED-pumped Ti:sapphire laser. With 2240 blue LEDs (at 450 nm) in pulsed regime (10 Hz, 15 µs), the pump module has a maximum emission at 530 nm and delivers up to 20.9 mJ with an irradiance of 9.9 kW/cm². This low-cost and compact pump system, among the brightest incoherent sources ever developed, enables a laser emission in Ti:sapphire (32 µJ at 790 nm). The tunability of the laser is demonstrated between 755 nm and 845 nm. The double pass small signal gain in the cavity is numerically simulated and measured to reach 1.066.

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“…Despite a cost in efficiency, this new kind of source benefits from all the advantages of the LED technology such as ruggedness, compactness, simplicity and low price [5][6][7]. For validation, LCs were used to pump rare-earth-doped crystals (Nd:YVO4 [5] and Nd:YAG [8]). Recently, we have demonstrated the first LED-pumped alexandrite laser with a LC [9]: this opens the route to the pumping of other transition doped materials.…”

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confidence: 99%

LED-pumped passively Q-switched Cr:LiSAF laser

Pichon

Druon

Blanchot³

et al. 2018

Opt. Lett.

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We report, to the best of our knowledge, the first light-emitting diode (LED)-pumped Cr:LiSAF laser, in both quasi-continuous-wave (QCW) and passively Q-switched operation. This Letter is based on the recent development of LED-pumped luminescent concentrators (LCs). Combining the capacity of high-density integration of blue LEDs with the excellent properties of Ce:YAG LCs, this new pump source can deliver high irradiance (7.3 kW/cm) in the visible to pump Cr:LiSAF. The Cr:LiSAF laser demonstrates an energy of 8.4 mJ at 850 nm in QCW (250 μs pulses at 10 Hz). A small signal gain per roundtrip of 1.44 at 850 nm and a wavelength tunability between 810 and 960 nm have been performed. A passively Q-switched oscillator is also presented using a Cr:YAG saturable absorber. A peak power of 3.1 kW is obtained with a pulse energy of 130 μJ and duration of 41.6 ns.

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High-radiance light sources with LED-pumped luminescent concentrators applied to pump Nd:YAG passively Q-switched laser

Cited by 18 publications

References 12 publications

LED-pumped whispering-gallery laser

LED-pumped whispering-gallery laser

Light-emitting diodes: a new paradigm for Ti:sapphire pumping

LED-pumped passively Q-switched Cr:LiSAF laser

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