Efficient second harmonic generation of femtosecond laser at 1 �m

Zhu, Heyuan; Wang, Tao; Zheng, Wanguo; Yuan, Peng; Qian, Liejia; Fan, Dianyuan

doi:10.1364/opex.12.002150

Cited by 47 publications

(21 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…19,20 Nevertheless, a spectral comparison of forward and backward detected second harmonic signals has not been done so far in the field of crystal optics. This comparison is of special interest for biomedical microscopy applications since in vivo imaging requires backward detection of nonlinear signals.…”

Section: -16mentioning

confidence: 99%

Spectral behavior of second harmonic signals from organic and non-organic materials in multiphoton microscopy

et al. 2015

View full text Add to dashboard Cite

Multimodal nonlinear microscopy allows imaging of highly ordered biological tissue due to spectral separation of nonlinear signals. This requires certain knowledge about the spectral distribution of the different nonlinear signals. In contrast to several publications we demonstrate a factor of 122 relating the full width at half maximum of a gaussian laser pulse spectrum to the corresponding second harmonic pulse spectrum in the spatial domain by using a simple theoretical model. Experiments on monopotassium phosphate crystals (KDP-crystals) and on porcine corneal tissue support our theoretical predictions. Furthermore, no differences in spectral width were found for epi- and trans-detection of the second harmonic signal. Overall, these results may help to build an optimized multiphoton setup for spectral separation of nonlinear signals.

show abstract

Section: -16mentioning

confidence: 99%

Spectral behavior of second harmonic signals from organic and non-organic materials in multiphoton microscopy

et al. 2015

View full text Add to dashboard Cite

show abstract

“…The general solution of (7) is (8) Equation (8) can be integrated to an analytically expression for some specific cases. When , i.e., GVD, and can be neglected, and is a constant as , we obtain (9) which is the same as the result of [1]. Though the evolution of SH pulse in various nonlinear structures can be obtained according to (8), we will derive a simple expression for both phase-and GVM structures (i.e., and ) in the temporal domain.…”

Section: Theoretical Analysesmentioning

confidence: 75%

“…For example, achromatic phase-matching (APM) [4]- [6] is implemented to improve conversion bandwidth. New experimental schemes with high nonlinear crystals, such as BaB O [7], LiB O [8], and partially deuterated KH PO [9] are used to enhance the conversion efficiency. More recently, a quasiphase-matched and group-velocity-matched (QPM-GVM) scheme [10]- [14] Manuscript received April 2, 2004 has also been proposed.…”

Section: Introductionmentioning

confidence: 99%

Analysis of ultrashort-pulse second-harmonic generation in both phase- and group-velocity-matched structures

2005

IEEE J. Quantum Electron.

View full text Add to dashboard Cite

Second-harmonic generation (SHG) of ultrashort pulse in both phase-and group-velocity mismatch structures is studied theoretically in temporal and frequency domains taking account of the effects of group-velocity dispersion (GVD) and high-order phase mismatch. Under the plane-wave and pump undepletion approximation, a set of simple analytical expressions is derived in frequency domain for Gaussian pulse. Furthermore, a formula describing the SH pulse is obtained under pump depletion condition. The obtained expressions are valid in large range of interaction length and have features such as explicit form, high accuracy, and less computing time. Meanwhile, the influences of intensity, pulse duration, chirp coefficient and shape of pump pulses, as well as the linear loss of material, on the pulsewidth preservation length are investigated by numerical method. In the case of both phase-and group-velocity mismatch structures, the conversion efficiency larger than 45% could be obtained without pulse distortion for weak input ultrashort pulse.Index Terms-Group-velocity matching (GVM), nonlinear optics, optical pulses, quasiphase matching, second-harmonic generation (SHG).

show abstract

“…The ability of KDP to withstand repeated exposures of high-power laser radiation, without damages, strains or subsequent inhomogeneities in the refractive index, allows for its use for operating high-pulse laser energies [2,3]. Actually, the nonlinear optical cells that utilize the KDP crystals seem to remain the only solution for the harmonics generation with the highest-intensity femtosecond Ti:sapphire lasers generating wide (> 30 mm) diameter beams and sub-terawatt or even terawatt peak power pulses [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Anisotropy of acoustooptic figure of merit in KH2PO4 crystals

Mys¹,

Krupych²,

Vlokh³

2017

Ukr. J. Phys. Opt.

View full text Add to dashboard Cite

Abstract.We have analyzed the anisotropy of acoustooptic figure of merit M 2 for KH 2 PO 4 crystals. Basing on our results, the highest M 2 coefficient, 7.1×10 -15 s 3 /kg, is achieved for the case of isotropic acoustooptic interaction. Then the optical wave, which is polarized in the XY plane and propagates along the direction [ 110 ], interacts with the longitudinal acoustic wave propagating in the same plane along [110]. For the case of anisotropic interactions, the maximum M 2 value is smaller, 5.3×10 -15 s 3 /kg. Then the slow transverse acoustic wave propagating in the XZ or YZ planes close to the X axis interacts with the optical wave propagating close to the optic axis.

show abstract

Efficient second harmonic generation of femtosecond laser at 1 �m

Cited by 47 publications

References 0 publications

Spectral behavior of second harmonic signals from organic and non-organic materials in multiphoton microscopy

Spectral behavior of second harmonic signals from organic and non-organic materials in multiphoton microscopy

Analysis of ultrashort-pulse second-harmonic generation in both phase- and group-velocity-matched structures

Anisotropy of acoustooptic figure of merit in KH2PO4 crystals

Contact Info

Product

Resources

About