Nd/Cr:YAG Ceramic Rod Laser Pumped Using Arc-Metal-Halide-Lamp

Saiki, Taku; Motokoshi, Shinji; Imasaki, K.; Fujita, Hisanori; Nakatsuka, Masahiro; Yamanaka, Chiyoe

doi:10.1143/jjap.46.156

Cited by 38 publications

(25 citation statements)

References 7 publications

(10 reference statements)

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“…Since then, researchers have been exploiting both parabolic mirrors and Fresnel lenses to attain enough concentrated solar radiation at focal point and several pumping schemes have been constructed for enhancing solar laser output performances [1][2][3][4][5][6][7][8][9][10][11][12]. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 single-crystal rods for solar laser operation, there still exist, in our opinion, some concerns about the advantages of Cr:Nd:YAG ceramic medium in solar-pumped lasers.…”

Section: Side-pumped Continuous-wavementioning

confidence: 99%

Side-pumped continuous-wave Cr:Nd:YAG ceramic solar laser

2013

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Abstract:To clarify the advantages of Cr:Nd:YAG ceramics rods in solar-pumped lasers, a fused silica light guide with rectangular cross-section is coupled to a compound V-shaped cavity within which a 7 mm diameter 0.1 at% Cr: 1.0 at% Nd:YAG ceramic rod is uniformly pumped. The highly concentrated solar radiation at the focal spot of a 2 m diameter stationary parabolic mirror is transformed into a uniform pump radiation by the light guide. Efficient pump light absorption is achieved by pumping uniformly the ceramic rod within the V-shaped cavity. Optimum pumping parameters and solar laser output powers are found through ZEMAX© non-sequential ray-tracing and LASCAD© laser cavity analysis codes. 33.6 W continuous-wave laser power is measured, corresponding to 1.32 times enhancement over our previous results with a 4 mm diameter Nd:YAG single-crystal rod. High slope efficiency of 2.6% is also registered. The solar laser output performances of both the ceramic and the single-crystal rods are finally compared, revealing the relative advantage of the Cr:Nd:YAG rod in conversion efficiency. Low scattering coefficient of 0.0018 cm-1 is deduced for the ceramic rod. Heat load is considered as a key factor affecting the ceramic laser output performance. Response to Reviewers: See attachmentAnswers to the Reviewers' comments:Dear Reviewer 1 Many thanks for your very helpful and insightful comments We would like to answer your comments one by one Reviewer #1: I believe that the paper presents an interesting result. However, there are many significant misunderstanding and unclear points which should be considered before further review.1. In Fig.5, they are comparing ceramic Cr.Nd YAG and Nd YAG crystal data but two conditions are completely Powered by Editorial Manager® and Preprint Manager® from Aries Systems Corporationdifferent. The size is different and input source is different. I doubt this comparison and it is not scientific. In addition, "Input solar power" in horizontal axis is misleading. They should put real incident solar power on the collecting mirror. The incident solar power of two experiments is almost 4 times different.With due respects, we think reviewer 1 has not been very careful in examining the manuscript.In Fig.5 Once again, the reviewer must have mistakenly compared the 10W/m2 collection efficiency with the 19.3 W/m2 value in Reference 8, which matches well with "a half of their previous result". Instead, our previous result in Ref. 10 was only 9.6W/m2 with the same PROMES-CNRS system, so the collection efficiency is slightly enhanced by using Cr:Nd:YAG ceramic rod in 2012.As mentioned in the manuscript, the total reflectivity of the whole solar energy collection and concentration system is only 59%. The back surface silver-coated plane mirror and parabolic mirror have more than 20 year´s service history. The collection efficiency can be largely improved by using front surface silver-coated mirrors.3. On page 3, they claimed the demerit of using optical fiber. However, I did not find the superiority of ...

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Section: Side-pumped Continuous-wavementioning

confidence: 99%

Side-pumped continuous-wave Cr:Nd:YAG ceramic solar laser

2013

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“…Although Cr 3+ ions can also be doped into ceramics, higher doping concentration leads to a poor optical quality of the product due to scattering; thus, the luminescent property of highly Cr 3+ ion-doped YAG ceramics ($10 mol% Cr concentration) has not been evaluated. Since the fabrication technique of transparent ceramics has been investigated actively, the doping rate of Cr 3+ has become higher in Cr 3+ -doped YAG ceramics ($3.0 mol%) with excellent optical quality in recent years [7][8][9][10][11][12][13][14][15][16]. Therefore, it is important to know about the optical properties in the higher concentration up to around 10 mol% of Cr 3 + .…”

Section: Introductionmentioning

confidence: 99%

Luminescence properties of highly Cr co-doped Nd:YAG powder produced by sol–gel method

Fujioka

Saiki

Motokoshi

et al. 2010

Journal of Luminescence

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“…Nd: Ce: YAG having a strong absorption cross-section in the lower wavelength region which falls into the spectrum of sun light can be a new material for solar pumped lasers. The absorption cross-section of Ce ion is much higher compared to Cr ions in Nd: Cr: YAG ceramic that has been earlier proposed for an efficient solar pumped laser [15]. Similarly, Nd: Ce: YAG ceramic lasers can replace Nd: YAG lasers that use lamp pumping.…”

Section: Resultsmentioning

confidence: 99%