Fraunhofer IZM, Technische Universität Berlin and eagleyard Photonics present various implementations of current micro-optical assemblies for high quality free space laser beam forming and efficient fiber coupling. The laser modules shown are optimized for fast and automated assembly in small form factor packages via state-of-the-art active alignment machinery, using alignment and joining processes that have been developed and established in various industrial research projects. Operational wavelengths and optical powers ranging from 600 to 1600 nm and from 1 mW to several W respectively are addressed, for application in high-resolution laser spectroscopy, telecom and optical sensors, up to the optical powers needed in industrial and medical laser treatment.
In this work, coupling of radiation generated by a distributed Bragg reflector (DBR) tapered diode laser around 1064 nm
into a single-mode-fiber (SMF) within a butterfly module with a footprint < 10 cm2 is demonstrated. The module
comprises temperature stabilizing components, a brightness maintaining micro optical assembly mounted with submicrometer
precision and a standard FC/APC output connector. The aim of the introduced concept is to improve the
beam quality and to eliminate the current dependent beam astigmatism, characteristic for tapered diode lasers and
amplifiers, and, thus, provide an efficient, multi-Watt laser light source characterized by a narrow-band spectrum and a
stigmatic, nearly Gaussian laser beam independent of the operating point. A maximum power ex SMF of 2.5 W at a
coupling efficiency of 57 % is reached in the presented butterfly module.
In this work a compact green laser light source is presented based on a single-pass second harmonic generation (SHG) in
non-linear material. The green light source consists of a distributed feedback (DFB) laser with a monolithically
integrated power amplifier (PA) and a periodically poled lithium niobate (PPLN) crystal with a ridge waveguide. To
achieve the smallest size and to reduce the number of parts to be assembled, a direct coupling approach is implemented
without using any lens. The waveguide of the laser is bent and the facet of the crystal is tilted and AR-coated in order to
reduce undesired reflections and to increase the stability of operation. By varying the injection current of the amplifier
the infrared output power of the laser changes proportionally. The wavelength remains stable during current variation
and in that way the green optical output power can also be modulated. No additional external modulator is required for
the generation of distinct green light levels. At a wavelength of 530 nm, a green optical output power of more than
35 mW is achieved for injection currents of 93 mA and 400 mA through the DFB section and amplifier section
respectively.
The authors have developed a new compact integration concept for a green laser emitter. Compact green light sources
are of great interest for several applications such as in spectroscopy and mobile displays. The requirements for such
sources are low noise, high-frequency modulation capability, compactness, reliability, low power consumption, and low
cost. The developed green-light source fulfils these requirements due to its dense integration while allowing larger
tolerances within the fabrication processes. The green-laser emission of 30 mW is generated using second harmonic
generation (SHG) in a nonlinear crystal. As pumping light source, a reliable GaAs semiconductor laser diode with an
emission wavelength at 1060 nm has been developed. This
single-wavelength distributed feedback (DFB) laser diode has
a sidemode suppression ratio better than 40 dB and an optical power of up to 325 mW. The SHG device is a periodically
poled lithium niobate (PPLN) waveguide. The 1060 nm pump light is directly coupled to the passive nonlinear
waveguide. To enable the precise operating temperature conditions for DFB and PPLN, both components are mounted
on separate temperature controllers. As confirmed also by
thermo-mechanical simulations, the presented compact,
reliable integration of green-light emitter enhances the overall yield by introducing a fabrication process tolerant
integration scheme.
We present a compact green light emitter for laser displays and focus on the pump source for a SHG waveguide in
single-pass configuration. The developed pump source has a RW-structure consisting of three sections: a DFB, a spacer
and an amplifier section. The optical output power is 305mW for currents of 120mA and 400mA in DFB and amplifier
section. The control of the current in the amplifier section allows a modulation of the output power from 5mW to
305mW. Spectral characteristics as well as measured beam divergence are well suited for pumping SHG waveguide
crystals. Results on the hybrid 530nm emitter are summarized.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.