A systematic study of PPLN length dependence in intracavity SHG

AbstractIn this paper, a systematic study of the relationship between nonlinear crystal length and intracavity second-harmonic generation (SHG) using MgO-doped periodically-poled lithium niobate (MgO:PPLN) is presented. The experimental results demonstrate a relationship between the maximum SHG power generated and the full-width at half maximum (FWHM) of the crystal’s temperature tuning curve to the length of the nonlinear optical crystal. It was shown that maximum SHG power increases rapidly with the increase of MgO:PPLN length, reaching a saturation length (~ 2 mm), which is much shorter than that predicted by the single-pass SHG theory. This saturation length of the MgO:PPLN crystal is almost independent on 808 nm pump power for typical powers used in continuous wave intracavity SHG lasers. In addition to this saturation effect, a broadening effect was also observed, the FWHM of the temperature tuning curve was shown to have a larger FWHM than that predicted by the single-pass SHG theory for MgO:PPLN shorter than the saturation length. This work has the benefit of allowing engineers to optimize nonlinear crystal length when developing intracavity SHG based diode-pumped solid state (DPSS) lasers.

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A Systematic Study of PPLN Length Dependence in Intracavity SHG

10.21203/rs.3.rs-578919/v1 ◽

2021 ◽

Author(s):

Tyler Kashak ◽

Liam Flannigan ◽

Chang-qing Xu

Keyword(s):

Systematic Study ◽

Continuous Wave ◽

Second Harmonic ◽

Tuning Curve ◽

Nonlinear Crystal ◽

Crystal Length ◽

Periodically Poled ◽

Single Pass ◽

Diode Pumped ◽

Temperature Tuning

Abstract In this paper, a systematic study of the relationship between nonlinear crystal length and intracavity second-harmonic generation (SHG) using MgO-doped periodically-poled lithium niobate (MgO:PPLN) is presented. The experimental results demonstrate a relationship between the maximum SHG power generated and the full-width at half maximum (FWHM) of the crystal’s temperature tuning curve to the length of the nonlinear optical crystal. It was shown that maximum SHG power increases rapidly with the increase of MgO:PPLN length, reaching a saturation length (~2 mm), which is much shorter than that predicted by the single-pass SHG theory. This saturation length of the MgO:PPLN crystal is almost independent on 808 nm pump power for typical powers used in continuous wave intracavity SHG lasers. In addition to this saturation effect, a broadening effect was also observed, the FWHM of the temperature tuning curve was shown to have a larger FWHM than that predicted by the single-pass SHG theory for MgO:PPLN shorter than the saturation length. This work has the benefit of allowing engineers to optimize nonlinear crystal length when developing intracavity SHG based diode-pumped solid state (DPSS) lasers.

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Green Generation by Single-Pass Frequency-Doubling in a Periodically Poled MgO:LiNbO3 at Room Temperature

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.622-623.1258 ◽

2012 ◽

Vol 622-623 ◽

pp. 1258-1261

Author(s):

Hong Bo An ◽

Bing Hua Su ◽

Li Hong Niu ◽

Jun Wen Xue

Keyword(s):

Room Temperature ◽

Continuous Wave ◽

Second Harmonic ◽

Frequency Doubling ◽

Green Emission ◽

Simulation Data ◽

Periodically Poled ◽

Single Pass ◽

Narrow Bandwidth ◽

Rayleigh Length

122mW green emission at 532.3nm with a conversion efficiency of 1.2% was measured by single-pass second-harmonic generation in a 10mm long periodically poled MgO:LiNbO3 (MgO:PPLN) crystal is reported. A continuous-wave Yb-doped fiber laser operating at 1064.6nm with narrow bandwidth of 0.1nm is used as pumping source. The experimental temperature acceptance bandwidth ΔT=4.6°C is a little higher than the simulation data of 4°C. Output power instabilities or variations of the green beam pattern were not observed during experiments. In this work, the optimized efficiency was achieved when the waist located at the center of MgO:PPLN and Rayleigh length equal to its length, and the lens’ location in the system was calculated.

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Efficient generation of continuous-wave yellow light by single-pass sum-frequency mixing of a diode-pumped Nd:YVO_4 dual-wavelength laser with periodically poled lithium niobate

Optics Letters ◽

10.1364/ol.27.001809 ◽

2002 ◽

Vol 27 (20) ◽

pp. 1809 ◽

Cited By ~ 79

Author(s):

Y. F. Chen ◽

S. W. Tsai ◽

S. C. Wang ◽

Y. C. Huang ◽

T. C. Lin ◽

...

Keyword(s):

Lithium Niobate ◽

Continuous Wave ◽

Dual Wavelength ◽

Yellow Light ◽

Periodically Poled ◽

Dual Wavelength Laser ◽

Sum Frequency ◽

Periodically Poled Lithium Niobate ◽

Single Pass ◽

Diode Pumped

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Каскадная генерация второй гармоники с половинным порядком периодической ориентации

Журнал технической физики ◽

10.21883/os.2020.11.50175.199-20 ◽

2020 ◽

Vol 128 (11) ◽

pp. 1717

Author(s):

В.Ю. Мыльников ◽

Н.С. Аверкиев ◽

Г.С. Соколовский

Keyword(s):

Light Propagation ◽

Second Harmonic ◽

Nonlinear Crystal ◽

Phase Matching ◽

Crystal Length ◽

Periodically Poled ◽

Second Stage ◽

Fourth Harmonic ◽

Harmonic Average ◽

Heisenberg Equations

We theoretically demonstrate cascaded fourth and second harmonic generation in a periodically-poled nonlinear crystal with a half-order of phase-matching period. We consider a cascaded process in which four photons of the fundamental harmonic firstly convert into an intermediate photon of the fourth harmonic, which parametrically decays into two photons of the second harmonic at the second stage. Phase-matching for this cascaded nonlinear conversion is provided by using an asymmetric periodical poling. We use the quantum spatial Heisenberg equations to describe light propagation and conversion inside the nonlinear crystal. With this approach, we calculate second and fourth harmonic average number of photons as a function of the nonlinear crystal length.

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42% efficient single-pass second-harmonic generation of continuous wave Nd:YAG laser output in 5.3-cm-length periodically poled lithium niobate

CLEO '97., Summaries of Papers Presented at the Conference on Lasers and Electro-Optics ◽

10.1109/cleo.1997.602238 ◽

2005 ◽

Cited By ~ 1

Author(s):

G.D. Miller ◽

R.G. Batchko ◽

W.M. Tulloch ◽

D.R. Weise ◽

M.M. Fejer ◽

...

Keyword(s):

Lithium Niobate ◽

Second Harmonic Generation ◽

Harmonic Generation ◽

Nd:Yag Laser ◽

Continuous Wave ◽

Second Harmonic ◽

Laser Output ◽

Periodically Poled ◽

Periodically Poled Lithium Niobate ◽

Single Pass

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Multicrystal, continuous-wave, single-pass second-harmonic generation with 56% efficiency

Optics Letters ◽

10.1364/ol.35.003513 ◽

2010 ◽

Vol 35 (20) ◽

pp. 3513 ◽

Cited By ~ 40

Author(s):

G. K. Samanta ◽

S. Chaitanya Kumar ◽

Kavita Devi ◽

M. Ebrahim-Zadeh

Keyword(s):

Second Harmonic Generation ◽

Harmonic Generation ◽

Continuous Wave ◽

Second Harmonic ◽

Single Pass

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Blue 473-nm solid state diode pumped Nd:YAG/BiBO microchip laser

Opto-Electronics Review ◽

10.2478/s11772-009-0018-7 ◽

2010 ◽

Vol 18 (1) ◽

Author(s):

A. Antończak ◽

J. Sotor ◽

M. Matysiak ◽

K. Abramski

Keyword(s):

Blue Light ◽

Second Harmonic ◽

Nonlinear Crystal ◽

Phase Matching ◽

Type I ◽

Pumping Power ◽

Diode Pumped ◽

Light Generation ◽

Power Diode ◽

Matching Type

AbstractIn this paper we present a design of a compact, low power diode-pumped CW Nd:YAG laser operating at 946 nm with intracavity blue light generation at 473 nm for battery operated applications. The nonlinear crystal used in the experiment is a BiBO crystal cut for phase-matching type I. Using 0.8 W of pumping power, 20-mW stabile output power of blue light was achieved. The second harmonic generation conversion efficiency was 2.5%.

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