Gain depletion due to amplified spontaneous emission in multi-pass laser amplifiers

Okuda, I.; Shaw, M. J.

doi:10.1007/bf00325517

Cited by 13 publications

(2 citation statements)

References 9 publications

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“…Due to the importance of the subject, in particular in high energy laser systems, many theoretical investigations in this area were carried out during the past few years [3][4][5]. For explaining specific experimental measurements various models and theoretical approaches considering different views on describing the ASE behavior have also been proposed and have appeared in the literature [6][7][8][9][10]. In the earliest general analytical approach for the ASE reported by Casperson and Yariv [3], it was shown that within an approximation, the ASE spectral width for homogeneously (H) and inhomogeneously or Doppler (D) broadened transitions reduces along the propagation direction, with the corresponding formulas given, respectively, by ν ASE,H ν 0 = √ ln 2 g 0,H (0)l and ν ASE,D ν 0 = 1 g 0,D (0)l .…”

Section: Introductionmentioning

confidence: 99%

Study of the amplified spontaneous emission spectral width and gain coefficient for a KrF laser in unsaturated and saturated conditions

Hariri¹,

Sarikhani²

2013

Laser Phys. Lett.

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On the basis of a model of a geometrically dependent gain coefficient, the amplified spontaneous emission (ASE) spectral width was calculated analytically for the nearly resonant transition of ν ∼ ν 0 , and also numerically for a wide range of transition frequencies. For this purpose, the intensity rate equation was used under unsaturated and saturated conditions. For verifying the proposed model, reported measurements of the ASE energy versus the excitation length for a KrF laser were used. For the excitation length of l = 84 cm corresponding to single-path propagation, the ASE spectral width for the homogeneously broadened transition was calculated to be 6.28 Å, to be compared with the measured 4.1 Å spectral width reported for a KrF oscillator utilizing a two-mirror resonator. With the gain parameters obtained from the ASE energy measurements, the unsaturated and saturated gain coefficients for l = 84 cm were calculated to be 0.042 cm −1 and 0.014 cm −1 , respectively. These values of the gain coefficient are comparable to but slightly lower than the measured gain coefficient for laser systems of 80-100 cm excitation lengths reported from different laboratories.

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Section: Introductionmentioning

confidence: 99%

Study of the amplified spontaneous emission spectral width and gain coefficient for a KrF laser in unsaturated and saturated conditions

Hariri¹,

Sarikhani²

2013

Laser Phys. Lett.

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“…ASE spectral narrowing and ASE intensity behavior are of particular importance in this subject and were studied and discussed in detail by Casperson and Yariv [2], Casperson [3], and Pert [4]. There are also many other reports in this area where different models were introduced with the intention of explaining the ASE measurements using different theoretical approaches [5][6][7][8][9][10][11]. In all of the reported theoretical approaches, the exact expression for the small signal gain, denoted by g 0 (z), was not given.…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of amplified spontaneous emission using a model based on a geometrically dependent gain coefficient

Hariri¹,

Sarikhani²

2013

J. Opt.

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It is shown that a model based on a geometrically dependent gain coefficient (GDGC), which is characterized by gain parameters (m′, , b), introduces a powerful method to describe amplified spontaneous emission (ASE) intensity behavior and its bandwidth reduction when the ASE is propagating along the z-direction. The model also gives correct predictions for unsaturated and saturated gain coefficients and the frequency dependence of the ASE output intensity in a given laser system. For the calculation, the GDGC model in saturated and unsaturated conditions along with the intensity rate equation were applied, and for verification of the model the reported ASE intensity measurements and the measured bandwidth reduction in KrF lasers were utilized. The present model will have applications in any type of pulsed laser system of different active media and different dimensions without going through complicated analysis or utilizing heavy computer numerical computations. Details of the present approach will be given and the excellent agreement with the available and typical experimental measurements for KrF lasers confirms the validity of the proposed GDGC model.

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Subpicosecond pulse amplification in low-pressure KrF laser medium

Lee

Jethwa

Endoh

et al. 1992

Optics Communications

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Gain depletion due to amplified spontaneous emission in multi-pass laser amplifiers

Cited by 13 publications

References 9 publications

Study of the amplified spontaneous emission spectral width and gain coefficient for a KrF laser in unsaturated and saturated conditions

Study of the amplified spontaneous emission spectral width and gain coefficient for a KrF laser in unsaturated and saturated conditions

Theoretical study of amplified spontaneous emission using a model based on a geometrically dependent gain coefficient

Subpicosecond pulse amplification in low-pressure KrF laser medium

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