Comparison of Potential Ceramic Gain Media

Garrec, B. J. Le; Bourdet, Gilbert L.; Cardinali, V.

doi:10.13182/fst09-a8929

Cited by 10 publications

(14 citation statements)

References 8 publications

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“…Previous publications also provide a wealth of information [1][2][3][15][16][17][18][19][20][21][22] . It is now well known that the value of the thermal conductivity increases as temperature is lowered, for all measured single crystals as well as for their ceramic counterparts.…”

Section: Review Of Important Laser Materials Propertiesmentioning

confidence: 99%

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Cryogenic nanosecond and picosecond high average and peak power (HAPP) pump lasers for ultrafast applications

Brown¹,

Tornegård²,

Kolis

2016

High Pow Laser Sci Eng

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Using cryogenic laser technology, it is now possible to design and demonstrate lasers that have concomitant high average and peak powers, with near-diffraction-limited beam quality. We refer to these new laser systems as HAPP lasers. In this paper, we review important laser crystal materials properties at cryogenic temperature, with an emphasis on Yb lasers, and discuss the important design considerations, including the laser-induced damage threshold, nonlinear effects and thermal effects. A comprehensive model is presented to describe diode pulsed pumping with arbitrary duration and repetition rate, and is used with the Frantz-Nodvik equation to describe, to first order, the performance of HAPP laser systems. A computer code with representative results is also described.

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Section: Review Of Important Laser Materials Propertiesmentioning

confidence: 99%

“…Figure 9 plots k, α and β for the uniaxial laser material GdVO 4 [2,19] . Finally, in Figure 10 we show measured values of k, α and β [21,22,26,27] for the anaxial laser and optical material CaF 2 . The values of α and β were measured at a wavelength of 632.8 nm [22] .…”

Section: Thermal Conductivity Thermal Expansion Coefficient and Thermentioning

confidence: 99%

Cryogenic nanosecond and picosecond high average and peak power (HAPP) pump lasers for ultrafast applications

Brown¹,

Tornegård²,

Kolis

2016

High Pow Laser Sci Eng

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“…The current trend for improving efficiency is to be able to combine several advantages while introducing engineering solutions: cryogenic cooling must be addressed to increase the overall efficiency, keeping in mind the efficiency of the cooling cycle. A factor of 3 has been shown to be possible [8] . Increase of the stored energy is also part of the solution because large gain media are becoming available thanks to ceramic developments.…”

Section: Diode-pumped Solid-state Lasers (Dpssls)mentioning

confidence: 99%

Challenges of high power diode-pumped lasers for fusion energy

Garrec

2014

High Pow Laser Sci Eng

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This paper reviews the different challenges that are encountered in the delivery of high power lasers as drivers for fusion energy. We will focus on diode-pumped solid-state lasers and we will highlight some of the main recent achievements when using ytterbium, cryogenic cooling and ceramic gain media. Apart from some existing fusion facilities and some military applications of diode-pumped solid-state lasers, we will show that diode-pumped solid-state lasers are scalable to inertial fusion energy (IFE)'s facility level and that the all-fiber laser scheme is very promising.

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“…Many experiments [1][2][3] show that the optical-to-optical efficiency of the amplification with YAG lasers doped Yb increases when the temperature of the amplification media is decreasing. This efficiency, which is 15% at room temperature, can reach 40% at a temperature in the range of 80-120 K.…”

Section: Laser Efficiencymentioning

confidence: 99%

“…As a consequence, the thermal gradient inside the amplification material can be reduced. In addition, experiments and simulations [1][2][3][4] have shown that laser materials have better amplifier performance when cooled. All these enhanced properties drive the development of high pulsed lasers at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Cryogenic cooling for high power laser amplifiers

Perin

Millet

Divoký

et al. 2013

EPJ Web of Conferences

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Abstract. Using DPSSL (Diode Pumped Solid State Lasers) as pumping technology, PW-class lasers with enhanced repetition rates are developed. Each of the Yb YAG amplifiers will be diode-pumped at a wavelength of 940 nm. This is a prerequisite for achieving high repetition rates (light amplification duration 1 millisecond and repetition rate 10 Hz). The efficiency of DPSSL is inversely proportional to the temperature, for this reason the slab amplifier have to be cooled at a temperature in the range of 100 K-170 K with a heat flux of 1 MW*m −2 . This paper describes the thermo-mechanical analysis for the design of the amplification laser head, presents a preliminary proposal for the required cryogenic cooling system and finally outlines the gain of cryogenic operation for the efficiency of high pulsed laser.

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Comparison of Potential Ceramic Gain Media

Cited by 10 publications

References 8 publications

Cryogenic nanosecond and picosecond high average and peak power (HAPP) pump lasers for ultrafast applications

Cryogenic nanosecond and picosecond high average and peak power (HAPP) pump lasers for ultrafast applications

Challenges of high power diode-pumped lasers for fusion energy

Cryogenic cooling for high power laser amplifiers

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