Sachin Joshi

Title: Innovations by Inventor Sachin Joshi

Introduction

Sachin Joshi is a notable inventor based in Fort Collins, Colorado. He has made significant contributions to the field of laser technology, particularly in the transmission of laser pulses. With a total of 3 patents, his work has advanced the understanding and application of optical fibers in various industries.

Latest Patents

One of Sachin Joshi's latest patents focuses on the transmission of laser pulses with high output beam quality using step-index fibers that have large cladding. This invention describes an apparatus and method for achieving superior beam quality by utilizing large core step-index silica optical fibers with thick cladding. The thick cladding effectively suppresses the diffusion of modal power to higher order modes at the core-cladding interface, resulting in a higher beam quality, M, than what is typically observed in large core, thin cladding optical fibers.

In his research, it was found that for a given numerical aperture (NA) and core size, increasing the thickness of the cladding improves the output beam quality. The mode coupling coefficients, D, were observed to scale approximately as the inverse square of the cladding dimension and the inverse square root of the wavelength. For instance, output from a 2-meter long silica optical fiber with a 100 µm core and a 660 µm cladding was found to be close to single mode, achieving an M value of 1.6. Another thick cladding fiber, with a 400 µm core and a 720 µm cladding, was utilized to transmit 1064 nm pulses of nanosecond duration, generating high beam quality to form gas sparks at the focused output.

Another significant patent involves an optical diagnostics integrated with a laser spark delivery system. This system is designed to generate a spark using a laser beam and includes a laser light source along with a laser delivery assembly. The assembly features a hollow fiber and a launch assembly equipped with focusing optics to input the laser beam into the hollow fiber. The exit focusing optics then demagnify the exit beam of laser light, increasing its intensity and creating a spark. This technology has potential applications in engines and includes methods for collecting light from the spark for diagnostic purposes.

Career Highlights

Sachin Joshi is affiliated with the Colorado State University Research Foundation, where he continues to innovate and contribute to research in laser technology. His work has garnered