Video Archive

Global Impact of Photonics - Steve Turner

Self-phase-locked Degenerate Synchronously Pumped Optical Parametric Oscillator - Samuel Wong

We demonstrated a stable femtosecond synchronously pumped optical parametric oscillator (SPOPO) that self-phase-locked when operating at degeneracy without any need for active stabilization. The nonlinear gain element was a 1-mm-long type-I periodically poled MgO:LiNbO_3 crystal phase-matched for 1550 nm. A mode-locked Ti:sapphire laser generating 180-fs pulses at 80 MHz was employed as the pump at 775 nm. The spectral bandwidth of the degenerate signal/idler was 50 nm around 1550 nm or 200 cm^-1 and thus exhibited an output comb broadening of about 3.

Optical Clocks and Applications - Jun Ye

Quantum state engineering of ultracold matter and precise control of optical fields have allowed accurate measurement of light-matter interactions for applications in precision tests of fundamental physics. State-of-the-art lasers now maintain optical phase coherence over one second. Optical frequency combs distribute this optical phase coherence across the entire visible and infrared parts of the electromagnetic spectrum, leading to direct visualization and measurement of light ripples.

One-Way Electromagetic Waveguides - Zongfu Yu

Road Modeling using Photonics in Autonomous Driving - Wende Zhang

This talk will introduce the SPRC audience of the General Motor’s research efforts on computer perception to improve driving safety. We will describe the DARPA Urban Challenge, which is a 60-mile race through an urban environment where vehicles had to follow the traffic rules, and GM-CMU’s entry Boss, the autonomous vehicle that won the challenge. We will overview Boss's system architecture and highlight its road modeling technologies using photonic sensors. We will also discuss a clear path detection method which is the next step to further improve the road modeling for autonomous driving.

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The Stanford Photonics Research Center