A sub-100fs self-starting Cr:forsterite laser generating 14W output power

Chia, Shih Hsuan; Liu, Tzu-Ming; Иванов, А. А.; Fedotov, A. B.; Желтиков, А. М.; Tsai, Ming Rung; Chan, Man‐Chor; Yu, Che‐Hang; Sun, Chi‐Kuang

doi:10.1364/oe.18.024085

Cited by 18 publications

(10 citation statements)

References 47 publications

(92 reference statements)

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“…The laser crystal, cooled down to 278 K, is located between a pair of 100 mm curvature-radius focusing mirrors. In agreement with the earlier studies [11,13], an increase in the temperature of the forsterite crystal in our system reduced the lifetime of the upper laser state and decreased the quantum yield of fluorescence. A semiconductor saturable-absorber mirror (SESAM) with a response time of 2 ps and modulation depth of 0.025 is used as a rear reflector of the laser cavity.…”

supporting

confidence: 93%

“…With specially designed chirped mirrors, a Cr: forsterite laser oscillator can deliver light pulses as short as 14 fs [5], which correspond to approximately three field cycles at 1.3 μm. An average power as high as 1.4 W has been achieved for a sub-100 fs output of a Cr: forsterite laser oscillator [11], and peak powers as high as 425 kW have been demonstrated [12].…”

mentioning

confidence: 99%

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Pulse-width-tunable 07 W mode-locked Cr: forsterite laser

et al. 2014

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A mode-locked chromium forsterite laser with output power in excess of 0.7 W, a central wavelength of 1.25 μm, a pulse repetition rate of 29 MHz, and an output pulse-width-tunable from 40 to 200 fs is demonstrated. The dynamics behind the buildup of ultrashort light pulses in this laser is shown to involve spectral and temporal breathing due to the interplay of gain, Kerr nonlinearity, and dispersion effects. The pulse-width-tunable 1.25 μm output delivered by the developed laser source suggests a powerful tool for nonlinear-optical bio-imaging and offers an advantageous front end for extreme-power laser technologies.

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supporting

confidence: 93%

mentioning

confidence: 99%

Pulse-width-tunable 07 W mode-locked Cr: forsterite laser

et al. 2014

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“…No temporal pulse broadening is found due to the use of CDM and DCM pairs. The results indicate that the proposed designs will pave the way for the development of intense ultrabroadband parametric synthesizers and in general dispersion control of multi-octave-bandwidth coherent optical sources [37].…”

Section: Discussionmentioning

confidence: 89%

Two-octave-spanning dispersion-controlled precision optics for sub-optical-cycle waveform synthesizers

Chia¹,

Cirmi²,

Fang³

et al. 2014

Optica

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Two-octave-spanning precision dispersive mirror systems are demonstrated, providing a new enabling technology for pulse-energy and bandwidth scaling of sub-cycle optical waveform synthesizers. We propose and characterize new dispersion management schemes with advanced dielectric coating designs. Based on an analytic dual adiabatic matching structure, we implement a chirped dichroic mirror, to efficiently optimize the beam combining from different spectra, and a double-chirped mirror pair, to avoid unwanted nonlinearity during beam propagation, with custom-tailored dispersion and reflectivity over more than two octaves of bandwidth ranging from 0.49 to 2.3 μm, supporting 1.9-fs-short sub-optical-cycle pulses. The multilayer coating structures can also be applied to the design of chirped-fiber Bragg gratings and general optical filters. The proposed designs and schemes will benefit ultrabroadband applications requiring precise dispersion management, especially enabling the generation of intense sub-optical-cycle light transients

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“…The objective of the imaging system was fixed on a rotatable arm to adapt the volunteer’s oral cavity.. A home-built Cr:forsterite laser operating at 1230 nm was used to observe the tissues [21,22]. This excitation wavelength enables minimal light attenuation in biological mucosa tissues [23] and the SHG and THG can be generated to fall within the visible spectrum range for deep tissue signal detection [24].…”

Section: Methodsmentioning

confidence: 99%

In vivo optical virtual biopsy of human oral mucosa with harmonic generation microscopy

Tsai

Chen

Shieh³

et al. 2011

Biomed. Opt. Express

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Recent clinical studies on human skin indicated that in vivo multi-harmonic generation microscopy (HGM) can achieve sub-micron resolution for histopathological analysis with a high penetration depth and leave no energy or photodamages in the interacted tissues. It is thus highly desired to apply HGM for in vivo mucosa histopathological diagnosis. In this paper, the first in vivo optical virtual biopsy of human oral mucosa by using epi-HGM is demonstrated. We modified an upright microscope to rotate the angle of objective for in vivo observation. Our clinical study reveals the capability of HGM to in vivo image cell distributions in human oral mucosa, including epithelium and lamina propria with a high penetration depth greater than 280 μm and a high spatial resolution better than 500 nm. We also found that the third-harmonic-generation (THG) contrast on nucleus depends strongly on its thicknesses, in agreement with a numerical simulation. Besides, 4% acetic acid was found to be able to enhance the THG contrast of nucleus in oral mucosa, while such enhancement was found to decay due to the metabolic clearance of the contrast enhancer by the oral mucosa. Our clinical study indicated that, the combined epi-THG and epi-second-harmonic-generation (SHG) microscopy is a promising imaging tool for in vivo noninvasive optical virtual biopsy and disease diagnosis in human mucosa.

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A sub-100fs self-starting Cr:forsterite laser generating 14W output power

Cited by 18 publications

References 47 publications

Pulse-width-tunable 07 W mode-locked Cr: forsterite laser

Pulse-width-tunable 07 W mode-locked Cr: forsterite laser

Two-octave-spanning dispersion-controlled precision optics for sub-optical-cycle waveform synthesizers

In vivo optical virtual biopsy of human oral mucosa with harmonic generation microscopy

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