SECOND HARMONIC GENERATION IN FERROELECTRIC LiTaO3 AND KNbO3 CONTAINING BULK NANO GLASS-CERAMICS

The precursor glasses in (mol%) 25.53Li2O-21.53Ta2O5-35.29SiO2-17.65Al2O3 (LTSA) and 25K2O-25Nb2O5-50SiO2 (KNS) glass systems were prepared by the melt-quench technique. Ferroelectric LiTaO3 (LT) and KNbO3 (KN) crystallites containing bulk nano glass-ceramics have been prepared by controlled crystallization of these precursor glasses respectively. Second harmonic generations (SHG) at 532 nm in both the glass-ceramics have been realized under fundamental beam of Nd3+ :YAG laser source (1064 nm). The SHG power output has been found to increase up to 14 and 62.4 nJ with variation of rotation angle for LT and KN bulk nano glass-ceramics respectively due to orientation of ferroelectric domains under applied field.

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An Optical Frequency Domain Angle Measurement Method Based on Second Harmonic Generation

Sensors ◽

10.3390/s21020670 ◽

2021 ◽

Vol 21 (2) ◽

pp. 670

Author(s):

Wijayanti Dwi Astuti ◽

Hiraku Matsukuma ◽

Masaru Nakao ◽

Kuangyi Li ◽

Yuki Shimizu ◽

...

Keyword(s):

Femtosecond Laser ◽

Second Harmonic Generation ◽

Frequency Domain ◽

Harmonic Generation ◽

Measurement Method ◽

Second Harmonic ◽

Angle Measurement ◽

Laser Source ◽

Optical Frequency ◽

Measurable Range

This paper proposes a new optical angle measurement method in the optical frequency domain based on second harmonic generation with a mode-locked femtosecond laser source by making use of the unique characteristic of the high peak power and wide spectral range of the femtosecond laser pulses. To get a wide measurable range of angle measurement, a theoretical calculation for several nonlinear optical crystals is performed. As a result, LiNbO3 crystal is employed in the proposed method. In the experiment, the validity of the use of a parabolic mirror is also demonstrated, where the chromatic aberration of the focusing beam caused the localization of second harmonic generation in our previous research. Moreover, an experimental demonstration is also carried out for the proposed angle measurement method. The measurable range of 10,000 arc-seconds is achieved.

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Simple method of detecting ferroelectric domains with non-phase-matched second-harmonic generation

Applied Optics ◽

10.1364/ao.37.003311 ◽

1998 ◽

Vol 37 (15) ◽

pp. 3311 ◽

Cited By ~ 1

Author(s):

Russell J. Gehr ◽

W. J. Alford ◽

A. V. Smith

Keyword(s):

Second Harmonic Generation ◽

Harmonic Generation ◽

Second Harmonic ◽

Simple Method ◽

Ferroelectric Domains

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Second Harmonic Generation Using an All-Fiber Q-Switched Yb-Doped Fiber Laser and MgO:c-PPLN

Advances in OptoElectronics ◽

10.1155/2008/956908 ◽

2008 ◽

Vol 2008 ◽

pp. 1-6 ◽

Cited By ~ 2

Author(s):

Yi Gan ◽

Xijia Gu ◽

Joyce Y. C. Koo ◽

Wanguo Liang ◽

Chang-qing Xu

Keyword(s):

Second Harmonic Generation ◽

Fiber Laser ◽

Harmonic Generation ◽

Second Harmonic ◽

Laser System ◽

Average Output ◽

Periodically Poled ◽

Theoretical Simulation ◽

Periodically Poled Lithium Niobate ◽

532 Nm

We have experimentally demonstrated an efficient all-fiber passively Q-switched Yb-doped fiber laser with Samarium doped fiber as a saturable absorber. Average output power of 3.4 W at a repetition rate of 250 kHz and a pulse width of 1.1 microseconds was obtained at a pump power of 9.0 W. By using this fiber laser system and an MgO-doped congruent periodically poled lithium niobate (MgO:c-PPLN), second harmonic generation (SHG) output at 532 nm was achieved at room temperature. The conversion efficiency is around 4.2% which agrees well with the theoretical simulation.

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