Analysis of pump excited state absorption and its impact on laser efficiency

Kerridge-Johns, William R.; Damzen, M. J.

doi:10.1088/1612-2011/12/12/125002

Cited by 20 publications

(10 citation statements)

References 15 publications

(29 reference statements)

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“…It has been previously shown that with just pump ESA (σ 1a = 0) the heating fraction is η H = (1 − η q η p ) [15], which continues to be valid when laser GSA is included by using Eq. 20 for η p .…”

Section: Appendix B: Heating Fractionmentioning

confidence: 74%

“…Previous models for Alexandrite have been for flashlamp pumped systems [3,4], but the efficiency of energy transfer from the pump to gain medium was not calculated leaving pump ESA unquantified. A theory has been developed for a four level end-pumped laser with pump ESA [15], but this is only applicable to Alexandrite in the spectral lasing region where laser ESA and GSA is negligibly small (approximately 760 nm to 780 nm).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analytical model of tunable Alexandrite lasing under diode end-pumping with experimental comparison

Kerridge-Johns¹,

Damzen²

2016

J. Opt. Soc. Am. B

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An analytical model is formulated to support understanding and underpin experimental development of laser action in the promising diode end-pumped Alexandrite system. Closed form solutions are found for output power, threshold and slope efficiency that for the first time incorporate the combined effects of laser ground state absorption (GSA) and excited state absorption (laser ESA), along with pump excited state absorption (pump ESA), in the case of an end-pumping geometry. Comparison is made between model predictions and experimental results from a fibre-delivered diode end-pumped Alexandrite laser system, showing the impact of wavelength tuning, crystal temperature, laser output coupling, and intracavity loss. The model is broadly applicable to other quasi-three-level lasers with combined laser and pump ESA. A condition for bistable operation is also formulated.

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Section: Appendix B: Heating Fractionmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Analytical model of tunable Alexandrite lasing under diode end-pumping with experimental comparison

Kerridge-Johns¹,

Damzen²

2016

J. Opt. Soc. Am. B

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“…• Analysis of pump excited state absorption and its impact on laser efficiency-a model to quantify the effect of excited state absorption at the pump wavelength on laser efficiency, threshold and heating is developed [6].…”

Section: • Enhanced Random Lasing From a Colloidal Cdse Quantum Dot-rmentioning

confidence: 99%

Introducing theLaser PhysicsandLaser Physics Lettershighlights of 2015

McKenna¹

2016

Laser Phys. Lett.

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The International Year of Light 2015 was a landmark for the laser and optics community pointing the way to a bright future for humanity and the environment. It is with great satisfaction that Laser Physics and Laser Physics Letters have published many notable articles that have contributed to the development of light-based technologies and breakthroughs in photonics. In recognition of their high quality, we present a selection of some of the most popular articles published by Laser Physics and Laser Physics Letters throughout 2015, all of which are believed to have the potential to make a high impact on future research directions. Those chosen are recognised for their high-interest with readers and importance in the field, providing a snapshot of the broad subject coverage and international make-up of both journals.Starting this year, we will be recognising and announcing annual highlights of a previous year for both journals. We hope that you find these highlights useful and look forward to publishing more cutting-edge work in the year ahead.Summary of the highlights articles: Physics of lasers• • Experimental investigation of the light shift effect in an optical-magnetic double resonance system-an experimental scheme for studying the light shift effect in an optical magnetic double resonance system by using 4 He atoms is demonstrated [3]. • Enhanced random lasing from a colloidal CdSe quantum dot-Rh6G system-randomlaser action in a system where optical amplification is provided by colloidal CdSe quantum dots triggered by the emission from Rhodamine 6 G is reported [4].• Ultra-short pulse generation in the hybridly mode-locked erbium-doped all-fiber ring laser with a distributed polarizer-ultra-short pulse generation in a dispersion-managed erbium-doped all-fiber ring laser hybridly mode-locked with boron nitride-doped singlewalled carbon nanotubes, in co-action with a nonlinear polarization evolution in the ring cavity with a distributed polarizer, is reported for the first time [5].• Analysis of pump excited state absorption and its impact on laser efficiency-a model to quantify the effect of excited state absorption at the pump wavelength on laser efficiency, threshold and heating is developed [6]. Fibre optics and fibre lasers• 80 fs passively mode-locked Er-doped fiber laser-an Er-doped laser that has an all-fiber design, including the dispersion compensation and external compression stages, forming a robust and compact device, is reported [7].• Bound-state fiber laser mode-locked by a graphene-nanotube saturable absorbermultiple bound states in a linear-cavity fiber laser mode-locked by a mixture of graphene and single-walled carbon nanotubes is experimentally observed [8]. Jarlath McKenna Publisher, Laser Physics and Laser Physics Letters Introducing the Laser Physics and Laser Physics Letters highlights of 2015Laser Physics Letters

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“…On top of these, excited state absorption also exists in the pumping wavelength region of Alexandrite [31]. The effect of pump excited state absorption on pumping efficiency has been discussed in [14,32,33]; and its temperature dependence is investigated in [33].…”

Section: Introductionmentioning

confidence: 99%

“…However, the progress has been relatively slow especially for the development of ultrashort pulse laser/amplifier sources, and there is currently a need for better understanding of Alexandrite laser gain media, for accurate modeling of its laser potential. Recent detailed work by Kerridge-Johns et al on the effect of pump and laser excited state absorption on laser performance has been an important step towards this aim [14,32,33]; however, efforts in this direction face a challenge due to the limited availability of spectroscopic data. For a laser design engineer, a thorough modeling of laser dynamics and its potential as an efficient laser requires detailed knowledge of wavelength and temperature dependence of all the relevant cross sections (σ em , σ esa , and σ a ) as well as the temperature dependence of fluorescence lifetime (τ F ).…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of Alexandrite effective emission cross section and small signal gain over the 25-450 °C range

Demırbas¹,

Sennaroğlu²,

Kärtner³

2019

Opt. Mater. Express

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We present detailed measurements of effective emission cross section spectra of the Alexandrite gain medium in the 25-450°C temperature range and provide analytic formulas that can be used to match the measured spectra. The measurement results have been used to investigate the wavelength and temperature dependence of small signal gain, as well as gain bandwidth relevant for ultrafast pulse generation/amplification. We show that the estimated laser performance based on the measured spectroscopic data provides a good fit to the results in the literature. We further discuss the need for a detailed measurement of excited-state absorption cross section in future studies.

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Analysis of pump excited state absorption and its impact on laser efficiency

Cited by 20 publications

References 15 publications

Analytical model of tunable Alexandrite lasing under diode end-pumping with experimental comparison

Analytical model of tunable Alexandrite lasing under diode end-pumping with experimental comparison

Introducing theLaser PhysicsandLaser Physics Lettershighlights of 2015

Temperature dependence of Alexandrite effective emission cross section and small signal gain over the 25-450 °C range

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