Frequency-converted dilute nitride laser diodes for mobile display applications

Abstract

We demonstrate a 1240-nm GaInNAs multi-quantum well laser diode with an integrated saturable electro-absorber whose wavelength is converted to 620 nm. For conversion, we used a MgO:LN nonlinear waveguide crystal with an integrated Bragg grating in direct coupling configuration. Broadened visible spectral width and reduced speckle as well as a high extinction ratio between the below and above threshold powers were observed in passively triggered pulsed operation with smooth direct current modulation characteristics. The demonstration opens a new avenue for developing 620-nm semiconductor lasers required for emerging projection applications.

A Wavelength Tunable CW Orange-red Laser Source Based on Magnesium Oxide-doped Periodically-poled LiNbO3 in an Intracavity Sum-frequency Generation

“…High power orange-red lasers in the 600 -650 nm region are strongly desirable visible laser sources can be utilized in such important applications as spectral analysis, biomedicine, optical pumping, and laser projection displays etc [1 -3]. Conventionally, high power orange-red lasers can be realized by intracavity sum-frequency generation (SFG) via various approaches, such as laser diode (LD) pumped Nd 3+ -doped crystals [4,5], Pr 3+ -doped crystals pumped by the intracavity frequency doubled Nd 3+ laser [6,7], GaInNAs/GaAs semiconductor disk laser based second-harmonic generation (SHG) [8,9], or Raman frequency shift technology [10,11]. However, such lasers usually output a single wavelength, which is not satisfied to the applications where wide band wavelength is required.…”

A low-temperature external cavity diode laser for broad wavelength tuning

“…A secondary enclosure (8), at atmospheric pressure and sealed against air currents, contains a diffraction grating (9) in the Littrow configuration, with the first order diffracted beam returning to the laser diode and the zeroth order beam reflecting off a mirror (10) and exiting the enclosure through another window. The mirror and grating are positioned on a two-axis adjustable mount (11), which allows independent tuning of the grating angle in the horizontal direction for wavelength selection and vertical direction for optical feedback adjustment.…”

“…Applications for lasers of these wavelengths (often in combination with frequency doubling) include slowing, cooling, trapping, and quantumstate-preparation of several different species of diatomic molecules [1][2][3][4] as well as laser cooling of beryllium ions for quantum information processing. 5,6 Techniques that have been previously employed to construct lasers in the 620 nm range include frequency doubling, 7,8 custom-fabrication of semiconductor materials, 9 and cryogenic cooling, 10 but these methods are typically costly and highly dependent on the specific final lasing wavelength. Alternatives to diode lasers include dye lasers, which operate at high power for many red wavelengths 11 but are maintenance-intensive, and optical parametric oscillators, which are broadly tunable across the visible spectrum 12 but are expensive to manufacture.…”