3results about How to "Wavelength tunable" patented technology

The invention discloses an AlGaN-based laser diode with tunable wavelength on a single wafer and a preparation method of the AlGaN-based laser diode. A plurality of two-dimensionally arranged ridge pattern arrays are prepared by using an etching method combining a room-temperature dry method and a wet method, each ridge pattern array is provided with a plurality of different ridges, each ridge with set width and shape corresponds to a lasing wavelength, and the plurality of different ridges correspond to a plurality of different lasing wavelengths respectively; a ridge pattern array is designed according to an effective refractive index, the width and the shape of ridges influence the effective refractive index and have a limiting effect on a transverse optical mode field and a carrier, so that the band gap of an atomic-scale ultrathin quantum well light-emitting layer is influenced, the lasing wavelength is further adjusted, and the wavelength-tunable AlGaN-based laser diode on a single wafer substrate is realized; according to the invention, fine regulation and control of short lasing wavelength can be realized, the method is simple and easy to control, the production time and the growth cost are obviously reduced, and the method has wide application in the field of laser diodes with adjustable and controllable lasing wavelength.

This invention provides a coherent anti-Stokes Raman microscope system, its driving method, and its microscopic apparatus. The coherent anti-Stokes Raman microscope system includes: a femtosecond laser front-end module, a dual-wavelength module, a pulse broadening and amplification module, a time delay module, a spectral broadening and filtering module, a second harmonic generation module, a dispersion compensation module, and a microscope module. The self-phase modulation spectral selection (SESS) driven coherent anti-Stokes Raman microscope system of this invention uses a self-phase modulation spectral selection (SESS) method to convert a 1550 nm pulse wavelength to 1600 nm. Through a frequency doubling crystal, a second harmonic generation process is achieved, converting the 1600 nm pulse wavelength to 800 nm, thus realizing coherent anti-Stokes Raman microscopy imaging, i.e., selective imaging of various biological tissue components. Compared with other wavelength conversion methods, the device is simple, has high conversion efficiency, is tunable, and has strong scalability.

The invention provides a coherent anti-Stokes Raman microscope system, a driving method thereof and a microscopic device. The coherent anti-Stokes Raman microscope system comprises a femtosecond laser front-end module, a dual-wavelength module, a pulse broadening amplification module, a time delay module, a spectrum broadening filtering module, a double frequency generation module, a dispersion compensation module and a microscope module. According to the coherent anti-Stokes Raman microscope system driven by self-phase modulation spectrum selection, a self-phase modulation spectrum selection (SESS) method is adopted to convert the pulse wavelength of 1550nm to 1600nm, a second harmonic generation process is realized through a frequency doubling crystal, the pulse wavelength of 1600nm is converted to 800nm, coherent anti-Stokes Raman microscopic imaging is realized, and the coherent anti-Stokes Raman microscope system driven by self-phase modulation spectrum selection has the advantages that the coherent anti-Stokes Raman microscope system is simple in structure and convenient to operate. Therefore, selective imaging of various biological tissue components is realized. Compared with other wavelength conversion methods, the device is simple, the conversion efficiency is high, the wavelength is tunable, and the expansibility is high.