High energy Q-switched 0.946 µm diode pumped laser

Axenson, Theresa J.; Barnes, Norman P.; Reichle, Donald J.

doi:10.1364/assl.2001.md5

Cited by 6 publications

(9 citation statements)

References 1 publication

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“…Furthermore, the 946 nm transition has a quasi 3-level scheme (see Figure 1a and Figure 1b), making efficient lasing at 946 nm even more problematic. Yet a number of publications describe laser systems with Nd 3+ -doped medium oscillating at 946 nm [3,6]. While lasing at the fundamental R 2 -Y 3 transition of Nd 3+ ions (at 1064 nm) is easy to achieve, getting oscillation on R 1 -Z 5 transition (at 946 nm) is much more difficult due to its inherent weakness, and its quasi 3-level scheme, with non-zero population of the Z 5 level as compared to the Y 3 level of the main transition (see Figure 1b).…”

Section: Neodimium-doped Laser Mediamentioning

confidence: 99%

“…(2) that for a high-quality cavity the output energy reaches only a few percent of its total intracavity value; and the pulse length is equal to several lifetimes of the cavity photons (see Figure 3), i.e., much longer than the roundtrip time. Therefore, for a low-loss cavity, the pulse duration is of the order of 10 2 roundtrip times [3], while the cavity dumping regime releases the intracavity energy into a short pulse with a duration equal the cavity roundtrip time. …”

Section: Pulse Durationmentioning

confidence: 99%

“…We will now estimate the efficiency of a real laser system as described in [3] by using the above described approach. This laser system with three modules and an optimal output coupler in the Q-switched regime had 75 mJ in a 75 ns long pulse at a pumping energy close to 1 J and a measured slope efficiency 0.091.…”

Section: Plug-in Efficiencymentioning

confidence: 99%

“…A typical example is the Ndions 946 nm transition that has almost an order of the magnitude lower emission cross-section than the main transition at 1064 nm [2]. As a result, traditional methods have failed to get efficient Q-switched lasing at 946 nm, since the oscillation pulse is usually much longer and its peak intensity smaller compared to that at 1064 nm [3].This has resulted in a very low efficiency when attempting to get a frequency doubled pulse around 460 to 480 nm [3,4].…”

Section: Introductionmentioning

confidence: 99%

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Q-switched lasing on a weak transition: new approach

Khizhnyak

Markov

2008

SPIE Proceedings

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This paper discusses an novel strategy in development, design and integration of a high efficient Q-switched laser operating on weak transitions of the lasing media. A typical example of such operation is lasing on the 946 nm transition of Nd-doped medium. The proposed approach enables very effective Q-switched operation on this type of weak transitions with the plug-in efficiency better than 10% at a few ns pulse length, as compared to recently reported less than 1% efficiency at pulse length of about 150 ns.

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Section: Neodimium-doped Laser Mediamentioning

confidence: 99%

Section: Pulse Durationmentioning

confidence: 99%

Section: Plug-in Efficiencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Q-switched lasing on a weak transition: new approach

Khizhnyak

Markov

2008

SPIE Proceedings

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“…1 With an output mirror reflectivity of 0.625, the laser had an optical to optical slope efficiency of 0.091. This oscillator produced in excess of 75 mJ per pulse in the TEM 00 mode when Q-switched.…”

Section: Introductionmentioning

confidence: 99%

Power amplifier for a Q-switched solid state diode-pumped laser operating at 0.946 μm

2003

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With the goal of obtaining high energy at 0.946 µm, we have built and characterized a power amplifier that will be used in conjunction with our Three Module Oscillator and PreAmplifier to further increase the available laser energy. Previously we obtained >75 mJ Q-switched energy in TEM 00 mode at 0.946 µm in an all solid state diode pumped system using Nd:YAG. 1 This transition is extremely useful to the remote sensing community, considering the presence of strong atmospheric water vapor absorption lines in this region. In order to obtain the higher energies that are necessary for such measurements, we have built a power amplifier. Gain was measured for varying input probe energies and the experimental results compared well with model predictions.

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Diode-pumped laser amplifiers: application to 0.946 m Nd:YAG

Barnes

Axenson

Reichle

et al. 2003

J. Phys. B: At. Mol. Opt. Phys.

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A diode-pumped laser amplifier model is derived from first principles and applied to a Nd:YAG amplifier operating on the 4F 3/2 to 4I 9/2 transition at 0.946 μm. The effects of amplified spontaneous emission are included in the model and the addition of this effect is shown to produce better agreement with the data. The amplifier model includes effects of the transverse and longitudinal variation of the pump beam, transverse and longitudinal variation of the probe beam, and multiple passes of the probe beam. Experimental results obtained with a quasi four-level Nd:YAG amplifier operating at 0.946 μm are used to validate the model. The amplifier was evaluated as a function of the pump energy, the probe energy, the probe beam radius, the pulse repetition frequency and the temperature. For all of the experimental conditions, the experimental results and the model agree.

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High energy Q-switched 0.946 µm diode pumped laser

Cited by 6 publications

References 1 publication

Q-switched lasing on a weak transition: new approach

Q-switched lasing on a weak transition: new approach

Power amplifier for a Q-switched solid state diode-pumped laser operating at 0.946 μm

Diode-pumped laser amplifiers: application to 0.946 m Nd:YAG

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