Solid-state source of intense yellow light based on a Ce:YAG luminescent concentrator

Sathian, Juna; Breeze, Jonathan; Richards, B. C.; Alford, Neil McN.; Oxborrow, M.

doi:10.1364/oe.25.013714

Cited by 40 publications

(28 citation statements)

References 29 publications

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“…Recently [1][2][3][4][5], we developed a new type of LED-based light source, the high lumen density (HLD) source, which is very stable and enables the mentioned applications (luminance > 2·10 9 cd/m 2 ). Similar concepts were investigated by others [6,7].…”

Section: Introductionmentioning

confidence: 72%

Extraction optics for high lumen density sources

Boer

Haenen

2019

J. Eur. Opt. Soc.-Rapid Publ.

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For lighting applications demanding high brightness, a new type of LED-based light source has been developed, the high lumen density (HLD) source (luminance > 2·10 9 cd/m 2 ). The performance can be improved further, among other things by optimizing the concentrator used as extraction optics. For this optimization, much insight is obtained by ray-tracing simulations. The efficiency can be improved by more than 20% if a high-index concentrator could be used. Furthermore, it is possible to optimize the shape of the concentrator. For a low-index (n ≈ 1.5) concentrator, the light leakage can be reduced, but the gain in useful light is only marginal. For a high-index (n ≈ 1.8) concentrator, the gain in useful light amounts to a few percent.

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Section: Introductionmentioning

confidence: 72%

Extraction optics for high lumen density sources

Boer

Haenen

2019

J. Eur. Opt. Soc.-Rapid Publ.

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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].…”

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].…”

mentioning

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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“…Moreover, unlike direct LED pumping, LCs offer the potential of power scaling thank to the conversion of massive collection of LED beams into a small emitting area. 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]).…”

mentioning

confidence: 99%

“…In our case the most significant losses are due to the Fresnel losses at the air/Ce:YAG interface (losses of 11%), the trapping and extraction efficiencies and the quantum shift. A part of the light from the LEDs is not absorbed and a part of the emitted light is reabsorbed but in a limited proportion with Ce:YAG (see [7]).…”

mentioning

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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Solid-state source of intense yellow light based on a Ce:YAG luminescent concentrator

Cited by 40 publications

References 29 publications

Extraction optics for high lumen density sources

Extraction optics for high lumen density sources

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

LED-pumped passively Q-switched Cr:LiSAF laser

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