Passively Mode-Locked Tm:YAG Ceramic Laser at 2 μm

Gluth, Alexander; Mateos, Xavier; Paajaste, J.; Suomalainen, Soile; Härkönen, Antti; Guina, Mircea; Steinmeyer, Günter; Veronesi, S.; Tonelli, M.; Li, Jiang; Pan, Yubai; Guo, Jingkun; Petrov, Valentín; Griebner, Uwe

doi:10.1364/assl.2013.af1a.2

Cited by 2 publications

(2 citation statements)

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“…Saturable absorbers are materials or systems experiencing saturation in the maximum amount of absorbed light when exposed to sufficiently high optical intensities. Well known systems exhibiting saturable absorption include graphene [21] ; carbon nanotubes [22,23] ; semiconductors such as gallium arsenide, silicon, and indium gallium arsenide, [24] organic dyes [25] ; transition metal dichalcogenides (layered materials with ultra-fast response times) [26] ; quantum dots [27] ; Kerr media [28,29] ; and carbon black. [30] The most common applications exploiting saturable absorption typically relate to laser mode-locking.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Loss Engineering in Near‐Zero‐Index Bulk Materials

Jaffray,

Clerici,

Heijnen

et al. 2023

Advanced Optical Materials

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Transparent conducting oxides (TCOs) show unprecedented optical nonlinearities in the near infrared wavelength range, where the real part of their linear refractive index approaches zero. More specifically, the Kerr nonlinearities of these materials have sparked widespread attention due to their magnitude and speed. However, due to the absorptive nature of these nonlinear processes, it is of fundamental interest to further investigate the imaginary component of the nonlinear index. The present work studies the nonlinear optical absorption properties of aluminium‐doped zinc oxide (AZO) thin films in their near‐zero‐index (NZI) spectral window. It is found that the imaginary part of the refractive index is reduced under optical excitation such that the field penetration depth more than doubles. An optically induced shift of the NZI bandwidth of ≈120 nm for a pump intensity of 1.3 TW cm−2 is also demonstrated. Looking into the optically induced spectral redistribution of the probe signal, local net gain is recorded, which is ascribed to a nonlinear adiabatic energy transfer. The present study adds key information about the fundamental interplay between real and imaginary nonlinear indices in NZI media, while advancing parametric amplification as viable direction for loss compensation.

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Section: Introductionmentioning

confidence: 99%

Nonlinear Loss Engineering in Near‐Zero‐Index Bulk Materials

Jaffray,

Clerici,

Heijnen

et al. 2023

Advanced Optical Materials

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show abstract

“…A great number of research works on transparent yttrium aluminum garnet ceramics doped with rare earths, including Nd 3+ , Yb 3+ and Er 3+ , have been published so far [1][2][3][4][5][6][7][8][9][10]. Tm 3+ and Ho 3+ dopants enabling the emission of the ''eye-safe'' wavelength of around 2 lm prove to be particularly attractive [11][12][13][14][15]. Laser radiation at this range is obtained in holmium as a result of transition from the 5 I 7 level to the 5 I 8 level, which corresponds to the wavelength of 2.09 lm.…”

Section: Introductionmentioning

confidence: 99%