The 23 reference contexts in paper V. Savitski G., В. Савицкий Г. (2015) “ИМПУЛЬСНЫЙ ВКР-ЛАЗЕР НА KGd(WO4)2: СУЖЕНИЕ ШИРИНЫ ЛИНИИ ИСПУСКАНИЯ // PULSED KGd(WO4)2 RAMAN LASER: TOWARDS EMISSION LINEWIDTH NARROWING” / spz:neicon:pimi:y:2015:i:1:p:18-25

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    The KGW Raman laser cavity was The KGW crystal was wrapped into indium foil sented below are obtained after deconvolution of intracavity etalon (VBG–, FP+); mental emissions in resonators. However, a comthe Raman wavelength either, as can be seen from The presence of the VBG in the fundamental man field need no longer build up from noise
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    . Raman laser linewidth to broaden in the presence fier Chain Techniques, Defense Technical Informaformed by the output coupler M3 (ROC 200 mm, and mounted in a brass mount. No water-cooling iv) Linewidth control of both the fundaplex study of the dynamics of fundamental emisFigure 5b, and the magnitude of the variation with laser cavity moves the emi
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    The only difference is the gain bandwidth in Nd:YLF crystal is ~ 1,35 nm is significantly lower than that of the seed. high pump powers could be due to the broadening near-Fourierment-limited response and measured spectra. mental and Raman emission (VBG+, FP+), with both fundamental and Raman laser cavities, the Raaverage wavelength: ~ 1156,35 nm for configura
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    . Therefore, it may be that the pulse energy The higher stability of the Raman wavelength of the effective double-pass transmittance additional injection seeding of the Raman laser. man laser emission linewidth at Raman threshold is tion i) and ~ 1156,6 for configuration ii), set by the at 1047 nm is lower with the VBG in the cavity in the configurations
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    to diffe- son with the fundamental laser. 1047 nm was measured without the KGW crystal in which occurred at Raman output energies of configurations iv) and v) (Figure 4d), when linewidth figurations ii)-v)), see Figure 5b.The pulse duration main reason why the Raman laser threshold of rent angles of incident to the FP filter [37], which The theory of SRS
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    predicts that in the the cavity and with an output coupler reflectivity of ~ 0,7–0,75 mJ, prevented any further increase in narrowing elements are present in both the fundaof the Raman laser output did not depend on the 35 W in configuration ii) is higher than that in conresults in broadening of the Raman emission.
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    in the Raman cavity Raman laser emission, even at high pump powers. with respect to the spontaneous Raman linewidth. at the angle of incidence of 7° were obtained at this frequency. The reduced pulse values are lower than for systems based on end1047 nm are presented in Figure 4. The linewidth different configurations are shown in Figure 5a. The
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    . This in turn explains the slightly lower slope Locking of the Raman resonator oscillation freIn this paper a proof of concept demonstration This narrowing is inversely proportional to the square energy of the Nd:YLF laser at frequencies below pumped neodymium lasers due to the side-pumpof the fundamental emission demonstrates some fundamental wavelength varied
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    in its behavior: the linewidth goes up around the average value of ~ 1047,28 nm without the the Raman laser in configuration iii) (VBG–, FP+), resonator length would significantly narrow the operating in pulsed mode with high peak power is The Nd:YLF laser cavity (the total length of narrowing. Its angle with respect to the cavity axis as 6 at the threshold for SRS
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    . In contrast, spontaneous emission or parasitic lasing [24]. this study. The corresponding Raman laser threshand down as a function on the diode pump power. VBG and at ~ 1047,42 nm with the VBG element. where the FP filter introduces additional losses to Raman laser emission further. limited) emission linewidth reported.
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    of ~ 1047,28 nm without the the Raman laser in configuration iii) (VBG–, FP+), resonator length would significantly narrow the operating in pulsed mode with high peak power is The Nd:YLF laser cavity (the total length of narrowing. Its angle with respect to the cavity axis as 6 at the threshold for SRS [28, 29, 33]. In contrast, spontaneous emission or parasitic lasing
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    . this study. The corresponding Raman laser threshand down as a function on the diode pump power. VBG and at ~ 1047,42 nm with the VBG element. where the FP filter introduces additional losses to Raman laser emission further. limited) emission linewidth reported.
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    Transmittance of the broader than the spontaneous Raman linewidth of a It should be noticed that the values of the dimental cavity did not contain the VBG element in Conclusion Ranging) applications
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    . For LIDAR, better performance of the Raman laser is studied. ~ –150 mm or longer (the manufacturer specifies a etalon as a function of wavelength after double crystal, the linewidth of the Stokes emission of the ode pump powers are given based on the manuthis case but the Raman threshold was ~ 38 % range and velocity resolution require shorter pulses
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    shorter pulses focal length of –750 mm at maximum diode pump passing of the laser beam (T2), which was calculated Raman laser will tend to be as broad as that of the The use of an Ng-cut KGW crystal in an infacturer’s calibration of the diode pump power higher than that in the case of configuration i) and narrower emission linewidths respectively
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    . Experimental setup power), and, simultaneously, against a thermal lens using the equation in [22] is shown in Figure 1b. fundamental [30, 34]. with respect to diode current, and could be slightly (VBG–, FP–).
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    which was calculated Raman laser will tend to be as broad as that of the The use of an Ng-cut KGW crystal in an infacturer’s calibration of the diode pump power higher than that in the case of configuration i) and narrower emission linewidths respectively [1]. Experimental setup power), and, simultaneously, against a thermal lens using the equation in
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    is shown in Figure 1b. fundamental [30, 34]. with respect to diode current, and could be slightly (VBG–, FP–). This can be explained in addition by tracavity pumped pulsed Raman laser was demonSimultaneous shortening of laser pulse duration and in the KGW of 200 mm focal length or longer.
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    tend to be as broad as that of the The use of an Ng-cut KGW crystal in an infacturer’s calibration of the diode pump power higher than that in the case of configuration i) and narrower emission linewidths respectively [1]. Experimental setup power), and, simultaneously, against a thermal lens using the equation in [22] is shown in Figure 1b. fundamental
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    . with respect to diode current, and could be slightly (VBG–, FP–). This can be explained in addition by tracavity pumped pulsed Raman laser was demonSimultaneous shortening of laser pulse duration and in the KGW of 200 mm focal length or longer.
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    The peak power of the pulses was 20 kW narrowing of the corresponding emission linewidth The Raman laser was built around a Ng-cut thermal lens in the KGW crystal results from the tributed-feedback (DFB) laser diode (Toptica example
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    where intracavity pumping of a and the emission linewidth was narrowed to KGd(WO4)2 (KGW) crystal, giving a positive output power of the KGW Raman laser in configuthe FP filter (see Figure 5b, black triangles), while require generation of transform-limited pulses.
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    (DFB) laser diode (Toptica example [35] where intracavity pumping of a and the emission linewidth was narrowed to KGd(WO4)2 (KGW) crystal, giving a positive output power of the KGW Raman laser in configuthe FP filter (see Figure 5b, black triangles), while require generation of transform-limited pulses. A inelastic nature of Raman scattering
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    . Our calphotonics) emitted a single transverse and longituBaWO4 Raman crystal (with the narrow Raman ration v), with injection seeding, was consistently 0,43 cm-1 at 1156 nm using linewidth narrowing the fundamental wavelength changes with the system with a high signal to noise ratio requires thermal lens [16, 17] which simplifies the Raman culatio
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    Our calphotonics) emitted a single transverse and longituBaWO4 Raman crystal (with the narrow Raman ration v), with injection seeding, was consistently 0,43 cm-1 at 1156 nm using linewidth narrowing the fundamental wavelength changes with the system with a high signal to noise ratio requires thermal lens
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    which simplifies the Raman culations indicate that the main factor, influencing dinal mode at 1156,6 nm was used to injection-seed linewidth of 1,6 cm-1) with a fundamental laser of higher than that in configuration iv) (i.e. with the pump power (see Figure 5a, black triangles), thus elements in both the fundamental and Raman cavihigh average power [1], and,
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    [16, 17] which simplifies the Raman culations indicate that the main factor, influencing dinal mode at 1156,6 nm was used to injection-seed linewidth of 1,6 cm-1) with a fundamental laser of higher than that in configuration iv) (i.e. with the pump power (see Figure 5a, black triangles), thus elements in both the fundamental and Raman cavihigh average power
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    , and, hence, high pulse laser cavity design. The crystal was 30 mm in the fundamental (TEM00) mode size of 1047 nm [23] the Raman laser via the reflection from the linewidth of 1,77 cm-1 led to a Raman laser emissame linewidth narrowing elements but without inducing a reduction in the Raman gain in the Raties as well as injection seeding of the
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    -seed linewidth of 1,6 cm-1) with a fundamental laser of higher than that in configuration iv) (i.e. with the pump power (see Figure 5a, black triangles), thus elements in both the fundamental and Raman cavihigh average power [1], and, hence, high pulse laser cavity design. The crystal was 30 mm in the fundamental (TEM00) mode size of 1047 nm
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    the Raman laser via the reflection from the linewidth of 1,77 cm-1 led to a Raman laser emissame linewidth narrowing elements but without inducing a reduction in the Raman gain in the Raties as well as injection seeding of the Raman re- length.
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    When the focal length of the 12 mW (being attenuated down to 3 mW after (increasing to 3,74 cm-1 at higher pump powers). The linewidth of the 1156 nm emission monand Raman wavelengths. sion was studied for different configurations of limits the range of the LIDAR system
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    . of fundamental laser emission was a diode sidethermal lens in the KGW crystal increases from passing through the isolator and waveplates, see The present experimental research deals with otonically decreased in moving from configuration The lower Raman laser slope efficiency of both the fundamental and Raman cavities.
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    200 to 1000 mm, the TEM00 beam radius of the Figure 1a), and could be tuned from 1155–1157 nm. the intermediate case, when the pump linewidth is i) to v), as shown in Figure 4. 2,4 % for configurations iv) and v) (i.e. VBG+, analysis performed shows that narrow linewidth for LIDAR applications are usually based on fiber 1047 nm and described in detail in
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    . The Ra1047 nm field increases from 190 to 345 m in the Emission from this laser diode was launched into not significantly narrower than the Raman li- emission in an intracavity pumped Raman laser The minimum Raman emission linewidth at FP+, with and without injection seeding) can be master oscillator power amplifier (MOPA) techman shift of 901 cm-
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    Injection newidth (which is 5,4 cm-1 in KGW crystal at the maximum pump power of 82,5 W was 0,06 nm can be achieved efficiently by the combination of explained by the combined effect of the linewidth nology
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    . On the other hand, conversion of the of the fundamental wavelength from 1047 nm to KGW. The TEM00 beam radii of the 1156 nm field seeding was not attempted without the FP etalon as Figure 2 – Output energies of fundamental (1047 nm) 901 cm-1 Raman frequency [36]).
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    On the other hand, conversion of the of the fundamental wavelength from 1047 nm to KGW. The TEM00 beam radii of the 1156 nm field seeding was not attempted without the FP etalon as Figure 2 – Output energies of fundamental (1047 nm) 901 cm-1 Raman frequency
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    ). Experimental narrow linewidth pump source and linewidth narnarrowing elements in both fundamental (VBG) pump wavelength via stimulated Raman scattering 1156 nm) was selected by appropriate choice of the in the KGW crystal varies from 213 to 203 m it provided the only way to inject the seed emission and Raman (1156 nm) lasers as a function (0,43 cm-1) for co
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    the only way to inject the seed emission and Raman (1156 nm) lasers as a function (0,43 cm-1) for configuration v) with injection data indicate that in this case, when no special rowing elements in the Raman laser cavity. Injecof Q-switching frequency seeding. The corresponding Raman laser average and Raman (FP) cavities. The VBG reduces the (SRS)
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    in crystalline media adds more flexibility coatings of Raman laser mirrors. An intracavity into the Raman cavity. Despite the fact that the when the focal length of thermal lens in the KGW narrowing elements are put in both fundamental tion seeding of Raman cavity was shown to be an output power was 1,33 W (pulse energy 0,67 mJ). intracavity pulse ene
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    Despite the fact that the when the focal length of thermal lens in the KGW narrowing elements are put in both fundamental tion seeding of Raman cavity was shown to be an output power was 1,33 W (pulse energy 0,67 mJ). intracavity pulse energy at the fundamental wavein terms of output wavelength
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    . However, Raman laser configuration [18–20], shown in Fi- calculated transmittance peak of the FP etalon is at and Raman laser cavities, the Raman laser crystal increases from 200 to 1000 mm.
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    Despite the fact that the when the focal length of thermal lens in the KGW narrowing elements are put in both fundamental tion seeding of Raman cavity was shown to be an output power was 1,33 W (pulse energy 0,67 mJ). intracavity pulse energy at the fundamental wavein terms of output wavelength [7–14]. However, Raman laser configuration
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    , shown in Fi- calculated transmittance peak of the FP etalon is at and Raman laser cavities, the Raman laser crystal increases from 200 to 1000 mm. The performance of the KGW Raman laser This Raman laser linewidth was about 30 % nareffective tool for further linewidth narrowing in length of 1047 nm, thus reducing the overall Raless work has
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    ) No linewidth control of the fundamenlaser configuration iv), i.e. without injection seedTo the best of our knowledge there is no research The cavities of the Nd:YLF laser and the to a product of the Raman gain, pump intensity and 1047 nm (R < 0,2 %). The VBG had reflectivity of cavity thanks to some divergence of the beam. similar to experimental results in
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    . Separate tal or Raman emission (VBG-, FP-); ing. Moreover, as it was already mentioned above,
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