EYE-SAFE Nd:KGd(WO4)2 LASER: NANO- AND SUBNANOSECOND PULSE GENERATION IN THE MODE OF SELF-FREQUENCY RAMAN CONVERSION AT ACTIVE Q-SWITCHING
Abstract
It is shown that for active Q-switching the shape of the multimode Stokes pulse generated by an eye-safe Nd:KGd(WO4)2 laser with Raman self-frequency conversion depends on the inhomogeneity of the active medium pump. At the moderate non-uniform pump characterized by a higher population inversion in the center of the active element, the laser emits a short undeformed Stokes pulse with a duration of ~2.5 ns increasing with the growth of the length of the laser cavity. Upon varying the reflectivity of the output coupler in the range 5-45% the Stokes pulse energy (~11.5 mJ) changes slightly. A significant increase in the pump inhomogeneity leads to the distortion of the Raman pulse shape. Under the condition of the fundamental TEM00 mode selection the degree of inhomogeneity of the pump is negligible, and the laser generates Stokes pulses of subnanosecond duration with a peak power of 1 megawatt.
Keywords
вынужденное комбинационное рассеяние,
ВКР-самопреобразование частоты,
безопасный для глаз KGd(WO4)2:Nd-лазер,
неоднородная накачка,
активная модуляция потерь,
короткий стоксов импульс,
stimulated Raman scattering,
self-frequency Raman conversion,
eye-safe Nd:KGd(WO4)2 laser,
non-uniform pumping,
active Q-switching,
short Stokes pulse
About the Authors
V. I. Dashkevich
B. I. Stepanov Iinstitute of Physics, National Academy of Sciences of Belarus
Russian Federation
Russian Federation
V. A. Orlovich
B. I. Stepanov Iinstitute of Physics, National Academy of Sciences of Belarus
Russian Federation
Russian Federation
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Review
For citations:
Dashkevich V.I., Orlovich V.A. EYE-SAFE Nd:KGd(WO4)2 LASER: NANO- AND SUBNANOSECOND PULSE GENERATION IN THE MODE OF SELF-FREQUENCY RAMAN CONVERSION AT ACTIVE Q-SWITCHING. Zhurnal Prikladnoii Spektroskopii. 2017;84(1):49-55. (In Russ.)
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