Role of undoped cap in the scaling of thin-disk lasers

Kouznetsov, Dmitrii; Bisson, Jean‐François

doi:10.1364/josab.25.000338

Cited by 45 publications

(26 citation statements)

References 21 publications

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“…For developing such ultra-high power laser systems, besides the thermal problems, other significant issues like the laser gain reduction due to Amplified Spontaneous Emission (ASE) and Parasitic Lasing (PL) have to be addressed. ASE problem in any inverted medium is the subject of intense research since the invention of the laser [5,6], and to avoid the severe impact of ASE and PL, many technical approaches have been proposed such as an anti-ASE cap [7][8][9], ASE absorber [10,11], and edge-face tilting [12]. Particularly, the anti-ASE cap, made from a transparent material, prevents the trapping of Spontaneous Emission (SE) inside the laser gain layer and suppresses the ASE effect increasing the maximum output power [13].…”

Section: Introductionmentioning

confidence: 99%

ASE and parasitic lasing in thin disk laser with anti-ASE cap

et al. 2013

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The amplified spontaneous emission (ASE) and parasitic lasing (PL) effects in thin disk laser with an anti-ASE cap have been investigated in detail by measuring both time-resolved radiated intensity at longer axis of elliptical pump profile (dominant ASE direction) and small signal gain (SSG) in laser amplifier. A cryogenically-cooled total-reflection active-mirror laser consisting of 9.8 at.% doped, 0.6-mm thick Yb:YAG and un-doped YAG trapezoidal ceramics cap was used as a sample. The phased transitions from spontaneous emission (SE) to ASE and from ASE to PL have been unambiguously observed. For several pump beam diameters, the ASE gain parameter g(0)l(ASE) at ASE threshold was about 3, and the SSG coefficient was down to about 65% until PL started. To the best of our knowledge, this is the first quantitative characterization of the ASE/PL effects in the thin disk laser with an anti-ASE cap.

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Section: Introductionmentioning

confidence: 99%

ASE and parasitic lasing in thin disk laser with anti-ASE cap

et al. 2013

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“…Thus, the effect of ASE can be evaluated for almost any GE geometry using the rather simple relation (10). At a uniform pump intensity profile, the present simulation results and the results obtained using Eqn (10) differ very little (Fig.…”

Section: Experimental Investigation Of An Yb : Yag Disk Gementioning

confidence: 63%

Calculation of the gain coefficient in cryogenically cooled Yb : YAG disks at high heat generation rates

Vadimova¹,

Mukhin²,

Kuznetsov³

et al. 2013

Quantum Electron.

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We have calculated the stored energy and gain coefficient in disk gain elements cooled to cryogenic temperatures. The problem has been solved with allowance for intense heat generation, amplified spontaneous emission and parasitic lasing, without averaging over any spatial coordinate. The numerical simulation results agree well with experimental data, in particular at high heat generation rates. Experimental data and theoretical analysis indicate that composite disk gain elements containing an undoped region can store considerably more energy due to suppression of amplified spontaneous emission and parasitic lasing.

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“…In this section we combine the estimates of papers [12,13] for the effective path of ASE in cases with anti-ASE cap and without (Fig. 1).…”

Section: Effective Path Of Ase and Effective Lifetimementioning

confidence: 99%

“…We use the simplest model [12] which still takes into account these three effects and allows to estimate the maximal power achievable at given value of the round-trip loss. In paper [13], the formalism is adopted for the case with an undoped layer ( Fig. 1), which acts as anti-ASE cap [6].…”

Section: Introductionmentioning

confidence: 99%

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Scaling laws of disk lasers

2009

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a b s t r a c t Limit of power from amplified spontaneous emission (ASE), round-trip loss, and overheating is considered within simple model. The optimization of the output power with respect to size of the pumped region, its thickness and round-trip gain leads to the scaling laws for these parameters. In vicinity of the limit of power scaling, the round-trip loss should scale inversely proportional to the cubic root of the desired output power. This prediction agrees with the experimental data. The use of the thick undoped layer (anti-ASE cap) allows to increase for an order of magnitude the maximal power achievable at the same round-trip loss.

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Role of undoped cap in the scaling of thin-disk lasers

Cited by 45 publications

References 21 publications

ASE and parasitic lasing in thin disk laser with anti-ASE cap

ASE and parasitic lasing in thin disk laser with anti-ASE cap

Calculation of the gain coefficient in cryogenically cooled Yb : YAG disks at high heat generation rates

Scaling laws of disk lasers

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