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Optical coherence microscopy (OCM) is a promising technique for high resolution cellular imaging in human tissues. An OCM system for high-speed en face cellular resolution imaging was developed at 1060 nm wavelength at frame rates up to 5 Hz with resolutions of < 4 microm axial and < 2 microm transverse. The system utilized a novel polarization compensation… (More)
We report on the development of a 50-mJ-class ∼10-ps chirped-pulse amplifier at kHz repetition rates using cryogenic Yb∶YAG regenerative and multi-pass amplifiers. The system is well suited as pump laser for kHz high-average-power ultra-broadband OPCPAs.
High-quality frequency references are the cornerstones in position, navigation and timing applications of both scientific and commercial domains. Optomechanical oscillators, with direct coupling to continuous-wave light and non-material-limited f × Q product, are long regarded as a potential platform for frequency reference in radio-frequency-photonic… (More)
Optical frequency combs-coherent light sources that connect optical frequencies with microwave oscillations-have become the enabling tool for precision spectroscopy, optical clockwork, and attosecond physics over the past decades. Current benchmark systems are self-referenced femtosecond mode-locked lasers, but Kerr nonlinear dynamics in high-Q solid-state… (More)
The generation of dissipative cavity solitons is one of the most intriguing features of microresonator-based Kerr frequency combs, enabling effective mode locking of comb modes and synthesis of ultrafast pulses. With the Lugiato–Lefever model, here, we conduct detailed theoretical investigations on the transient dynamics of dissipative cavity solitons and… (More)
We study the wavelength scaling of high harmonic generation efficiency with visible driver wavelengths in the transition between the tunneling and the multiphoton ionization regimes where the Keldysh parameter is around unity. Our experiment shows a less dramatic wavelength scaling of efficiency than the conventional case for near- and mid-IR driver… (More)
Scaling of high order harmonic generation (HHG) efficiency with drive-wavelengths is investigated using 800-nm and 400-nm pulses. We demonstrate good agreement with a recently established model for HHG taking laser and material parameters into account.
This study proposes a real-time abnormal heartbeat detection and emergency system for helping users to obtain immediate rescue and treatment in a short period of time when they suffer from severe heart disease, for example, acute myocardial infarction (MI) or fatal malignant arrhythmia. The proposed system can detect abnormal heartbeat waveforms and… (More)
We demonstrate synchronized few-cycle 800-nm and 2-µm pulse trains seeded from a single Ti:sapphire oscillator, able to generate scalable, high-energy pulses lasting less than a single electric-field cycle. Such pulses are attractive for high-field physics.