Pump-induced lensing effects in diode pumped Alexandrite lasers

Tawy, Goronwy; Wang, Jian; Damzen, M. J.

doi:10.1364/oe.27.035865

Cited by 16 publications

(3 citation statements)

References 36 publications

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“…Figure 11(a) shows the lens dioptric power (inverse of focal length f ) measured as a function of absorbed pump power under both lasing and non-lasing conditions. The measured lens dioptric power is found to be significantly weaker under lasing conditions in agreement with our previous work [23]. Using the measured values for f , Fig.…”

Section: Tem 00 Cavity Design Model With Direct Pump-induced Lensing supporting

confidence: 91%

“…It is therefore essential to know the variation in pump-induced lensing f with absorbed pump power. To precisely determine the lens dioptric power, a direct wavefront measurement technique with a probe beam and Shack-Hartmann wavefront sensor was used, as described in our previous work [23]. Figure 11(a) shows the lens dioptric power (inverse of focal length f ) measured as a function of absorbed pump power under both lasing and non-lasing conditions.…”

Section: Tem 00 Cavity Design Model With Direct Pump-induced Lensing mentioning

confidence: 99%

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High-power 7.4W TEM₀₀ and wavelength-tunable alexandrite laser with a novel cavity design and efficient fibre-coupled diode-pumping

Tawy¹,

Minassian²,

Damzen³

2020

OSA Continuum

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We report significant improvement in the performance of TEM 00 alexandrite laser operation by employing high power fibre-coupled red diode pumping, novel cavity design, and active direct Shack-Hartmann wavefront sensor measurement of pump-induced lensing. We demonstrate 12.7 W of laser power in low-order (M 2 ∼ 5) mode operation from a compact double-end-pumped cavity, and with novel cavity design, a record power of 7.4 W in TEM 00 operation with excellent beam quality (M 2 ≤ 1.1). With single-end pumping, laser power of 4.7 W (M 2 ∼ 1.3) was achieved with slope efficiencies as high as 54.9 %; a record efficiency for red-diode-pumped alexandrite. Using a birefringent filter, continuous laser wavelength tuning from 725-808 nm is achieved in diffraction-limited TEM 00 mode, with laser power of 4.7 W at 765 nm, and >1 W across 730-805 nm, which is a higher tunable power than any other directly diode-pumped vibronic laser, to the best of our knowledge.

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Section: Tem 00 Cavity Design Model With Direct Pump-induced Lensing supporting

confidence: 91%

Section: Tem 00 Cavity Design Model With Direct Pump-induced Lensing mentioning

confidence: 99%

High-power 7.4W TEM₀₀ and wavelength-tunable alexandrite laser with a novel cavity design and efficient fibre-coupled diode-pumping

Tawy¹,

Minassian²,

Damzen³

2020

OSA Continuum

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“…Whilst significant energy storage is possible within alexandrite, the emission cross section is over an order of magnitude less than that of Nd:YAG. This requires intensive pumping which leads to high inversion and significant pump-induced lensing [16] in a high-energy system. A high pulse energy TEM 00 oscillator is demanding, especially when combined with very narrow linewidth (< 30 MHz for potassium resonance scattering lidar [17]).…”

Section: Introductionmentioning

confidence: 99%

High-energy diode-pumped alexandrite amplifier development with applications in satellite-based lidar

Coney

Damzen

2020

J. Opt. Soc. Am. B

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Efficient, wavelength-tunable diode-pumped alexandrite laser systems offer the potential for a more versatile, satellite-based lidar source compared to fixed wavelength Nd:YAG systems and non-space compliant lamp-pumped alexandrite. In this paper, we develop a strategy to enable the high-energy operation required for atmospheric lidar based on an efficient diode-pumped Master-Oscillator Power-Amplifier (MOPA) system design. A novel multi-pass 'diamond' slab amplifier geometry is introduced alongside the experimental results of the world's first diode-pumped alexandrite amplifier producing a gain of 2.13 in a demonstration system. A diode-pumped Q-switched alexandrite oscillator is presented with a record-highest pulse energy of 3.80 mJ. Detailed optimisation of a two-stage amplifier design is studied numerically and maximised with temperature, wavelength and pump pulse duration to produce 50 mJ pulse energy. This forms part of an optimised alexandrite MOPA design capable of high pulse energy, showing the future potential of diode-pumped alexandrite for satellite-based atmospheric lidar.

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Power-scaled CW Alexandrite lasers

Tawy

Minassian²,

Damzen

2023

Appl. Phys. B

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We present several strategies for increasing the output laser power of near-diffraction limited continuous-wave Alexandrite lasers pumped by fibre-coupled red laser diodes. Laser mode size control using a convex mirror with the varying thermal lens is shown to be an efficient method for generating record levels of output power from a diode-pumped Alexandrite laser. 8.6 W is obtained with $$M^{2}<1.1$$ M 2 < 1.1 and an optical efficiency of 27%. 735–790 nm wavelength tuning is demonstrated with $$> {2.5}\,\hbox {W}$$ > 2.5 W and a record dual-wavelength output power of 4.2 W. In a ring-cavity geometry, 5.1 W is obtained with $$M^{2}<1.1$$ M 2 < 1.1 showing promising potential for multi-watt single-longitudinal-mode operation. Detailed laser cavity modelling including thermal lens analysis is also provided.

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Pump-induced lensing effects in diode pumped Alexandrite lasers

Cited by 16 publications

References 36 publications

High-power 7.4W TEM₀₀ and wavelength-tunable alexandrite laser with a novel cavity design and efficient fibre-coupled diode-pumping

High-power 7.4W TEM₀₀ and wavelength-tunable alexandrite laser with a novel cavity design and efficient fibre-coupled diode-pumping

High-energy diode-pumped alexandrite amplifier development with applications in satellite-based lidar

Power-scaled CW Alexandrite lasers

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Pump-induced lensing effects in diode pumped Alexandrite lasers

Cited by 16 publications

References 36 publications

High-power 7.4W TEM00 and wavelength-tunable alexandrite laser with a novel cavity design and efficient fibre-coupled diode-pumping

High-power 7.4W TEM00 and wavelength-tunable alexandrite laser with a novel cavity design and efficient fibre-coupled diode-pumping

High-energy diode-pumped alexandrite amplifier development with applications in satellite-based lidar

Power-scaled CW Alexandrite lasers

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Product

Resources

About

High-power 7.4W TEM₀₀ and wavelength-tunable alexandrite laser with a novel cavity design and efficient fibre-coupled diode-pumping

High-power 7.4W TEM₀₀ and wavelength-tunable alexandrite laser with a novel cavity design and efficient fibre-coupled diode-pumping