Temperature dependence of giant pulse amplification in YAG:Nd<sup>3+</sup>

Buchenkov, V. A.; Vitrishchak, I. B.; Evdokimova, V G; Soms, Leonid N.; Stepanov, A. I.; Stupnikov, V. K.

doi:10.1070/qe1981v011n06abeh007030

Cited by 15 publications

(4 citation statements)

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“…3, the Nd/Cr:YAG ceramics excited at 808 nm showed a substantial gain reduction with increasing temperature, as was reported for conventional Nd:YAG. 25) By contrast, the gain coefficient for excitation at 610 nm increased with increasing temperature.…”

Section: Measurement Of Gain Coefficientsmentioning

confidence: 95%

“…23,24) The efficiency of energy transfer from Cr 3+ to Nd 3+ increased slightly with increasing temperature (from 79.2% at 293 K to 83.7% at 473 K). 18) Conventional Nd:YAG usually exhibits a substantial reduction in gain with increasing temperature above 300 K. 25) The causes are considered to be an increase in the number density at the lower laser level ( 4 I 11/2 ) of Nd 3+ and a shift of the peak wavelength of the gain. However, for Nd/Cr:YAG ceramics, Saiki et al reported that the smallsignal gain was maintained at temperatures up to 473 K, which they attributed to enhancement of the effective emission cross-section and the effective lifetime of Nd 3+ at high temperature.…”

Section: Introductionmentioning

confidence: 99%

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Temperature dependence of the small-signal gain of a Cr³⁺ and Nd³⁺ co-doped Y₃Al₅O₁₂ ceramic

Honda¹,

Motokoshi²,

Jitsuno³

et al. 2021

Jpn. J. Appl. Phys.

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There is a demand for higher-efficiency neodymium and chromium co-doped yttrium aluminum garnet (Nd/Cr:YAG) ceramics that can be excited by broadband light sources, such as flash lamps. We experimentally investigated the temperature dependence of the gain coefficient of a Nd/Cr:YAG ceramic (Nd: 1.0 at%, Cr: 2.0 at%). The gain coefficient at 1064 nm decreased with increasing temperature when Nd3+ was directly excited at 808 nm. However, when Nd3+ was excited via energy transfer from Cr3+ excited at 610 nm, the gain coefficient increased with increasing temperature. This temperature dependence was theoretically explained by solving the rate equations for Nd/Cr:YAG. Nd/Cr:YAG ceramics pumped with flash lamps may provide good laser performance without loss of gain even at high temperatures.

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Section: Measurement Of Gain Coefficientsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Temperature dependence of the small-signal gain of a Cr³⁺ and Nd³⁺ co-doped Y₃Al₅O₁₂ ceramic

Honda¹,

Motokoshi²,

Jitsuno³

et al. 2021

Jpn. J. Appl. Phys.

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“…Extensive spectroscopic studies have been reported for Nd 3+ ions in YAG at room temperature and at cryogenic temperatures [2][3][4][5][6] . The temperature dependence of small signal gain in Nd: YAG in the range of 250 K-500 K and of the stimulated emission cross section of the 1.064 µm Nd 3+ laser transition in YAG in the range of temperatures between -70° C to 70° C have been reported 7,8 . The stimulated emission cross-section for 4 → 2 3 F 4 2 11 I transition of an active ion have been determined from the spectral properties of the intensity of emission [19].…”

Section: Introductionmentioning

confidence: 97%

A high repetition rate multiwavelength polarized solid state laser source for long range lidar applications

2006

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Advances in Laser Technology and nonlinear Optical techniques can be effectively utilized for LIDAR applications in space and atmospheric sciences to achieve better flexibility and control of the available optical power.Using such devices, one can achieve highly accurate and resolved, measurement of the distribution for atmospheric scattering layers. In the present investigation a diode double end pumped high repetition rate, multi wavelength Nd:YAG laser is designed, fabricated and various laser beam parameters have been characterized for LIDAR applications.Nonlinear optical techniques have been employed to generate higher harmonics like 532nm, 355nm and 266nm for various spectral studies. The experimental setup mainly consists of two Fiber coupled pump laser diodes (Model FAP-81-30C-800B, Coherent Inc,USA) with a maximum output power of 30Watt at a wavelength of 807-810nm at 30 o C set temperature. A second harmonic LBO crystal cut for critical phase matching placed within the laser resonator is provided for converting a fraction of the fundamental beam to a second harmonic beam. A type II frequency tripling LBO nonlinear crystal (cut for critical phase matching) is also located inside the laser resonator. The third harmonic beam and the unconverted fundamental beam are then directed across a type I fourth harmonic LBO crystal cut for critical phase matching where a portion of the fundamental beam and a portion of the third harmonic beam are converted to a fourth harmonic frequency when both fundamental and third harmonic beams propagate through the frequency quadrupling crystal. The resulting beams which are the fundamental (1064nm), second harmonic(532nm), third harmonic (355nm) and fourth harmonic(266nm) are then directed to a fourth harmonic separator in which the fourth harmonic beam is separated from the fundamental beam. A maximum average power of 12W at 1064nm, 8W at 532nm, 5W at 355nm and 3W at 266nm have been measured at a repetition rate of 10KHz.A minimum pulse width of 25ns have been observed. # sudheer@sahajanand.co.in; phone 0091-261-2451451;fax 0091-261 sahajanand.co.in

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“…[16][17][18][19][20] The temperature dependence of a small signal gain in Nd:YAG in the range of 250 K -500 K and of the stimulated emission cross section of the 1.064-m Nd 3+ laser transition in YAG in the range of temperatures between −70°C to 70°C have been reported. 21,22 The stimulated emission cross section for 4 F 3/2 → 4 I 11/2 transition of an active ion has been determined from the spectral properties of the intensity of emission. 22 This is called the Fuchtbauer-Ladenburg ͑F-L͒ method.…”

Section: Introductionmentioning

confidence: 99%

High data rate laser transmitter based on a diode double end-pumped Nd:YAG laser with linearly polarized output for free space laser communication

et al. 2008

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Optically pumped solid-state lasers with Nd:YAG may have to operate over a wide range of temperatures. We designed and fabricated a diode double end-pumped Nd:YAG laser for free space laser communication. Various laser beam parameters have been characterized for the same application. The temperature dependence of the effective stimulated emission cross section for 4 F 3/2 → 4 I 11/2 transition and fractional thermal loading of Nd:YAG are determined using a planar resonator with two collimated and focused pump beams from fiber-array package laser diodes at 808 nm. The pump power-induced thermal lensing is used to stabilize the cavity. The diode double end-pumped Nd:YAG laser possesses an extremely good beam profile that exactly matches the theoretical Gaussian intensity distribution up to a diode current of 30 A. After that the ellipticity slightly increases, indicating deviation from the circular symmetry of beam, which may be due to the thermally induced birefringence of the Nd:YAG crystal offered to the polarized laser beam. The thermal lens focal length decreases with an increase in the absorbed pump power, similar to the case of a lamp pumped Nd:YAG laser and a diode pumped Nd: YVO 4 laser. All the results indicate that the laser beam characteristics are useful for high data rate free space laser communication links.

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Temperature dependence of giant pulse amplification in YAG:Nd³⁺

Cited by 15 publications

References 1 publication

Temperature dependence of the small-signal gain of a Cr³⁺ and Nd³⁺ co-doped Y₃Al₅O₁₂ ceramic

Temperature dependence of the small-signal gain of a Cr³⁺ and Nd³⁺ co-doped Y₃Al₅O₁₂ ceramic

A high repetition rate multiwavelength polarized solid state laser source for long range lidar applications

High data rate laser transmitter based on a diode double end-pumped Nd:YAG laser with linearly polarized output for free space laser communication

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Temperature dependence of giant pulse amplification in YAG:Nd3+

Cited by 15 publications

References 1 publication

Temperature dependence of the small-signal gain of a Cr3+ and Nd3+ co-doped Y3Al5O12 ceramic

Temperature dependence of the small-signal gain of a Cr3+ and Nd3+ co-doped Y3Al5O12 ceramic

A high repetition rate multiwavelength polarized solid state laser source for long range lidar applications

High data rate laser transmitter based on a diode double end-pumped Nd:YAG laser with linearly polarized output for free space laser communication

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Product

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About

Temperature dependence of giant pulse amplification in YAG:Nd³⁺

Temperature dependence of the small-signal gain of a Cr³⁺ and Nd³⁺ co-doped Y₃Al₅O₁₂ ceramic

Temperature dependence of the small-signal gain of a Cr³⁺ and Nd³⁺ co-doped Y₃Al₅O₁₂ ceramic