Tunable dual-wavelength operation of an external cavity semiconductor laser

Compact All-Quantum-Dot-Based Tunable THz Laser Source

“…Within the last two decades, several techniques have been demonstrated that are capable of delivering a dual-wavelength operation of external-cavity diode lasers. These concepts include the use of a dual-wavelength volume-Bragg grating [13], an Y-or V-shaped slit [14,15], a V-shaped double-stripe mirror [16], or a dual-period holographic element [17] in the laser cavity. Although some of these approaches can offer some tunability of mode separation by moving the position of a slit or a mirror, their tuning ranges are limited.…”

Dual-wavelength high-power diode laser system based on an external-cavity tapered amplifier with tunable frequency difference

“…Different techniques have been developed to achieve dual-wavelength operation of a diode laser system, and they mainly can be classified into two categories: (1) Monolithic dual-wavelength diode lasers [6][7][8][9][10], and (2) diode laser systems based on different external-cavity feedback techniques [11][12][13][14][15][16][17]. The monolithic dual-wavelength diode lasers show stable dual-wavelength operation, but the frequency difference of the two wavelengths is not tunable or the tuning range is limited, and the output power from the monolithic dual-wavelength diode lasers is normally less than 500 mW [8].…”

“…The monolithic dual-wavelength diode lasers show stable dual-wavelength operation, but the frequency difference of the two wavelengths is not tunable or the tuning range is limited, and the output power from the monolithic dual-wavelength diode lasers is normally less than 500 mW [8]. Different external-cavity feedback techniques have been developed for dual-wavelength diode laser systems, and different frequency selective elements have been used in these dual-wavelength external-cavity diode laser systems, such as bulk diffractive gratings for the double-Littman and double-Littrow external-cavity techniques [11,12,15], dual-fiber Bragg grating [13], dual-period holographic element [14], and single-wavelength volume Bragg gratings or monolithic multiplexed Bragg grating [16,17].…”

“…The gain device in the external-cavity dual-wavelength diode laser system is usually a single-mode ridge-waveguide diode laser, so the output power from these laser systems is normally a few hundreds milliwatts [11][12][13][14][15]. In a few cases, broad-area diode lasers are used as gain device, and more than 1.7 W output power has been achieved with fixed frequency difference [16,17].…”

A self-referencing biosensor based upon a dual-mode external cavity laser

“…Dual-mode ECLs have been studied for applications in optical communications, atomic laser spectroscopy, and environmental monitoring, but this work represents its initial application to optical biodetection. [14][15][16][17][18] In the dual-mode ECL sensor system, the two PCs are bonded to the opposite sides of a thin chamber frame, forming a flow cell that enables a test sample to be exposed to two PC sensors simultaneously. One of the PCs is modified with specific surface chemistry to perform the sensing function (termed the "active" or "sensing" PC), while the "reference" PC is untreated (or alternatively, treated with a biomolecular blocking layer that resists surface adsorption).…”