Compact, efficient, scalable neodymium laser co-doped with activ

Details Compact, efficient, scalable neodymium laser co-doped with activ Compact, efficient, scalable neodymium laser co-doped with activ

1993-02-22

1994-02-08

Scott, Jr., Leon

Coherent light generators

Particular pumping means

372 19, 372 92, 372 68, 372 41, 372 75, H01S 309

Patent

active

052854671

ABSTRACT:
Efficient, low threshold laser emission from a laser crystal doped with chromium and neodymium ions is obtained when pumped by visible laser diodes in the range of 610 nm to 680 nm. A typical laser Cr,Nd:GSGG crystal having an extraordinarily broad absorption bandwidth allows high pump efficiencies when using visible laser diodes, particularly in comparison to the Nd:YAG laser. The broad absorption bandwidth tolerance of the Cr,Nd:GSGG crystal to the pumping wavelengths allows visible diode pumping of the neodymium transition without regard to the wavelength of the visible diodes. Longitudinal or end-pumping to take advantage of the emission properties of the visible laser diodes, a nearly hemispherical laser resonator configuration and other co-doped Cr,Nd laser host materials are disclosed. Consequently, costs are reduced for the semiconductor pump as well as producing a compact, efficient, lightweight and reliable laser previously unachievable with other types of laser or lamp pumping. As an improvement in a laser pumped Cr,Nd:GSGG laser, diode pumping brings the advantages of high electrical to optical efficiencies and compact design. End-pumping with the visible diodes allows efficient utilization of the visible laser diode pump light and further allows a more ideal overlap between the inversion profile created within the laser crystal by the pump fluence and the TEM.sub.00 resonator mode extracting fluence.

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