Athermal directions and their dispersion in KGd(WO 4 ) 2  and KLu(WO 4 ) 2  crystals

Филиппов, В. В.

doi:10.1016/j.optcom.2015.07.072

Cited by 1 publication

(2 citation statements)

References 35 publications

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“…The value for P 14 , the relevant coefficient for the shear stress in the X 3 -X 2 direction, would then either be much smaller or of opposite sign. Since shear stresses are much more important for longer crystals, this may explain the contrasting thermal lensing characteristics observed in much shorter Nd:KGW rod lasers [17,18,29]. High shear stresses may also be responsible for the astigmatic lensing with a strong negative lens component also observed in tetragonal tungstate Raman crystals such as BaWO 4 [30].…”

Section: End-face Distortionmentioning

confidence: 99%

“…Being in the monoclinic crystal class, it has anisotropic optical, thermal and mechanical properties. These anisotropies make analysis highly complex but may be potentially exploited for producing characteristic laser behavior or as an interesting method for reducing thermal effects (see, for example, athermal studies of [17,18]). Recently, we found that significant astigmatic thermal lensing in a high power KGW Raman laser was responsible for reduced efficiency and highly elongated output beams [19].…”

Section: Introductionmentioning

confidence: 99%

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Thermal lens evolution and compensation in a high power KGW Raman laser

McKay¹,

Kitzler²,

Mildren³

2014

Opt. Express

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The transient thermal lens in a high-average power double metal tungstate Raman laser has been investigated. An external cavity potassium gadolinium tungstate (KGW) laser designed for second-Stokes output was burst-pumped with up to 46 W of average power at a pulse repetition rate of 38 kHz. At low duty-cycle, the laser generated up to 18 W of on-time average Raman power with a conversion efficiency of 40%. At high duty cycle, efficiency is reduced and the near-field beam profile expands in the X1' crystal direction over a period of tens of milliseconds. The evolution of the spatial beam properties occurs in response to the development of a highly astigmatic thermal lens with fast-axis susceptibility of approximately -1.7 m-1 per watt of Raman output power. We show that the likely cause for astigmatism is primarily photo-elastic in origin. Beam circularization was achieved by incorporating an intracavity convex cylindrical lens.

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