Compact DPSS UV sources are of interest for replacing Ar-Ion lasers in applications that require cw or quasi-cw laser
radiation. One way to generate UV light at 355nm and 266nm is by modelocking an IR Nd:YVO4 laser and converting
the ps pulses into the second, third, and fourth harmonic. The mechanism of choice is passive modelocking using a
Saturable Bragg Reflector (SBR). We have developed an air-cooled system capable of UV output powers in excess of
6W. Laser performance as well as lifetime data will be presented for wavelengths at 355nm and 266nm.
Optically pumped semiconductor material is a complimentary gain medium for rare earth or transition metal doped crystals. The design of several compositions based on GaAs allows the realization of a wavelength range between 710nm and 1180nm. This can be diode pumped and frequency doubled to cover the near UV up to the yellow spectral range. The power is scaleable and we have realized several Watts at 488nm and 460nm. Experimental results will be presented and discussed as well as reliability data to show that this technology has ripened for industrial applications.
Optically pumped, external-cavity, surface emitting semiconductor lasers (also known as optically pumped semiconductor lasers, OPS lasers, and vertical external cavity surface emitting lasers, VECSELs) generate near-diffraction limited beams from low brightness diode-array pumps. We have demonstrated 30 W cw at 980 nm and 15 W cw at 488 nm in a single spatial mode from these emitters and believe they can be scaled to > 100 W. Potential applications we have explored for such devices include wavelength conversion, spectral and spatial brightness conversion.
We report on the development and testing of a laser system that delivers up to 200 mW of continuous-wave radiation at 198.54 nm in a near diffraction-limited beam, to be used as a source for photolithography mask writing and mask inspection. The source has been developed with the support of International SEMATECH. The laser output is obtained by intra-cavity sum frequency generation in a CLBO (Cesium Lithium Borate) non-linear crystal
The performance of collinear and noncollinear pulsed barium borate optical parametric oscillators is analyzed under third harmonic Nd:YAG pumping. In the collinear case the effects of output coupling, cavity length and pump spotsize on threshold and slope efficiency have been measured and compared to a simple model. Tuning ranges, bandwidths and efficiencies are compared for collinear operation and for both directions of noncollinear operation. For a low pump divergence collinear operation is more efficient, but noncollinear operation is favored for a pump divergence in excess of 4 milliradians. Single frequency OPO operation with less than 250 MHz bandwidth is obtained using a simple new injection seeding technique for both signal and idler. Precise crystal temperature control is used to simultaneously manipulate the gain envelope and mode frequencies, ensuring stable seeding on the strongest mode.
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.