Ultrabroadband chirped mirrors for femtosecond lasers

Mayer, Ernest; Möbius, J.; Euteneuer, A.; Rühle, W. W.; Szipöcs, R.

doi:10.1364/ol.22.000528

Cited by 61 publications

(34 citation statements)

References 17 publications

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“…Recently it was shown that ultrabroadband chirped mirrors can be made that exhibit negative GDD and positive TOD (Fig. 7b), while having a reflectivity exceeding 99% over a bandwidth of 600-1100 nm [63,98]. This means that a combination of chirped mirrors and a prism compressor provides flexible control over TOD across a large spectral range [63].…”

Section: Compressor Designmentioning

confidence: 96%

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All-solid-state cavity-dumped sub-5-fs laser

Baltuška¹,

Zheng²,

Pshenichnikov³

et al. 1997

Applied Physics B: Lasers and Optics

159

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Section: Compressor Designmentioning

confidence: 96%

“…Third, the output coupler OC has been placed at the nondispersive end of the cavity, providing an additional output at 82 MHz. Last, we have saved space by replacing the output (cavity-dumped) pulse pre-compressor, consisting of four prisms [50], with two chirped mirrors [63].…”

mentioning

confidence: 99%

All-solid-state cavity-dumped sub-5-fs laser

Baltuška¹,

Zheng²,

Pshenichnikov³

et al. 1997

Applied Physics B: Lasers and Optics

159

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“…Dielectric mirrors exhibiting relatively high GD on reflection, however, are not exclusively used in ultrashort pulse laser systems. UBCM structures [7] are widely used in broadly tunable CW or ns pulse lasers or in optical parametric oscillators and amplifiers for beam steering or feedback over a wide frequency range. In these applications, linear absorption loss, subsequent heating, and mirror damage could be critical issues.…”

mentioning

confidence: 99%

“…Proportionality between the absorptance and the GD is very important for application of ultrabroadband chirped mirrors (UBCMs) [7] or highly dispersive mirrors [8] in high power, pulsed laser systems: these mirrors are used for broadband feedback and dispersion compensation, and their reflection GD is typically one or two orders of magnitude higher than that of the low-dispersion QW stacks. However, low reflection loss is crucial in case of dielectric mirrors designed for such lasers: the absorbed power of the laser beam is transformed to heat, which can lead to wavefront distortion or, worse, damage to the coating due to a linear absorption process, which is the dominating damage mechanism for >50 ps pulse durations [9] .…”

mentioning

confidence: 99%

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Relationships among group delay, energy storage, and loss in dispersive dielectric mirrors

Antal

Szipöcs

2012

中国光学快报

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We show that absorbed and stored electromagnetic energy are proportional to the reflection group delay in highly reflective dispersive dielectric mirrors over the high-reflectivity band. Our theoretical considerations are verified by numerical simulations performed on different dielectric mirror structures. The revealed proportionality between group delay and absorbed energy sets constraint on the application of ultrabroadband and/or dispersive dielectric mirrors in broadband or widely tunable, high-power laser systems.OCIS codes: 310. 6805, 140.3330, 260.2030. doi: 10.3788/COL201210.053101.In the last two decades, theoretical and experimental investigations on reflection delay time of optical pulses reflected by multilayer dielectric structures have been of scientific interest because frequency-dependent group delay (GD) of the dielectric mirrors can be well suited for intracavity or extracavity dispersion compensation of ultrashort pulse lasers [1] . Aperiodic dielectric mirror structures, which are often referred to as chirped mirrors, are advantageous, not only because they introduce a certain amount of negative dispersion, but also because they exhibit a considerably broader highreflectance band than standard, low-dispersion quarterwave (QW) mirror stacks. Aside from chirped mirrors, there is another group of dispersive mirrors referred to as: Gires-Tournois interferometer-type mirrors [2] . The fact that a relationship exists between the electromagnetic energy stored in the volume of a thin-film structure and its GD is known in the field of telecommunication technology [3] . This relationship is also a starting point in resolving the long-haul scientific problem of superluminal delay times of electromagnetic wave packets during transmission through highly reflective, lossless photonic bandgap structures [4] . In practical laser systems, however, one usually cannot neglect the absorption (or scattering) loss of dielectric multilayer mirrors because laser performance, such as intracavity loss, beam quality, maximum output power, laser damage threshold power, and others, strongly depends on these physical quantities. From this aspect, one can address the question of whether a general relationship exists between the reflection GD and the absorption loss of a dielectric multilayer mirror (throughout the letter, we mean one-photon or linear absorption when we use the word "absorption"). For QW-stack mirrors, GD and absorptance have been shown as proportional to each other at the central wavelength of the QW mirror when the loss is sufficiently low [5] . For a specific multistack multilayer mirror design, Ferencz et al. also found conspicuous, but unexplained, proportionality of these two physical quantities [6] . For a nonspecific, general, highly reflective dielectric mirror structure, however, neither the relationship between GD and the absorptance nor the relationship between GD and the stored energy in the presence of loss has been investigated systematically thus far.In this letter, we first theoretically d...

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In vivosecond-harmonic generation andex vivocoherent anti-stokes raman scattering microscopy to study the effect of obesity to fibroblast cell function using an Yb-fiber laser-based CARS extension unit

Haluszka

Lőrincz

Molnár

et al. 2015

Microsc. Res. Tech.

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Nonlinear microscopy techniques are being increasingly used to perform in vivo studies in dermatology. These methods enable us to investigate the morphology and monitor the physiological process in the skin by the use of femtosecond lasers operating in the red, near-infrared spectral range (680-1,300 nm). In this work we used two different techniques that require no labeling: second harmonic generation (SHG) for collagen detection and coherent anti-Stokes Raman scattering (CARS) to assess lipid distribution in genetically obese murine skin. Obesity is one of the most serious public health problems due to its high and increasing prevalence and the associated risk of type 2 diabetes and cardiovascular diseases. Other than these diseases, nearly half of patients with diabetes mellitus suffer from dermatological complications such as delayed wound healing, foot ulcers and several other skin changes. In our experiment we investigated and followed the effects of obesity on dermal collagen alterations and adipocyte enlargement using a technique not reported in the literature so far. Our results indicate that the in vivo SHG and ex vivo CARS imaging technique might be an important tool for diagnosis of diabetes-related skin disorders in the near future.

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Ultrabroadband chirped mirrors for femtosecond lasers

Cited by 61 publications

References 17 publications

All-solid-state cavity-dumped sub-5-fs laser

All-solid-state cavity-dumped sub-5-fs laser

Relationships among group delay, energy storage, and loss in dispersive dielectric mirrors

In vivosecond-harmonic generation andex vivocoherent anti-stokes raman scattering microscopy to study the effect of obesity to fibroblast cell function using an Yb-fiber laser-based CARS extension unit

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