High brightness diode output methods and devices
Devices and methods for maintaining the brightness of laser emitter bar outputs having multiple emitters for coupling and other applications. In some embodiments, at least one brightness enhancement optic may be used in combination with a beam reformatting optic.
1. An optical system, comprising:
a first laser emitter bar having a first output with a first output axis;
a second laser emitter bar having a second output with a second output axis which is oriented substantially perpendicular to the first output axis;
a brightness enhancement optic which is operatively coupled to the first output and second output, which is configured to redirect the second output to a propagation direction substantially parallel to the propagation direction of the first output and interleave the first and second outputs, and which comprises a periodic interleaver having an output surface with optically transmissive sections alternating with optically reflective sections wherein each beam of the first output of the first laser emitter bar is directed to an optically transmissive section and each beam of the second output of the second laser emitter bar is reflected by a reflective section in a direction substantially parallel to the direction of the first output and wherein the optically transmissive sections and optically reflective sections are configured as parallel stripes of substantially equal width having a pitch that is substantially the pitch of the laser emitter bar emitters multiplied by about 1.40 to about 1.42;
a first fast axis collimator disposed between the first laser emitter bar and the brightness enhancement optic and operatively coupled to the first output of the first laser emitter bar;
a second fast axis collimator disposed between the second laser emitter bar and the brightness enhancement optic and operatively coupled to the second output of the second laser emitter bar;
a first beam reformatting optic disposed between the first laser emitter bar and the brightness enhancement optic and operatively coupled to the first output of the first laser emitter bar; and
a second beam reformatting optic disposed between the first laser emitter bar and the brightness enhancement optic and operatively coupled to the second output of the second laser emitter bar.
2. The system of claim 1 further comprising a slow axis collimator operatively coupled the first and second outputs of the first and second laser emitter bars respectively.
3. The system of claim 1 further comprising focusing optics operatively coupled to an output of the brightness enhancement optic.
4. The system of claim 1 wherein the width of the optically reflective and transmissive sections is about one half the pitch of the sections.
5. The system of claim 1 wherein the periodic interleaver comprises a plate having substantially parallel surfaces which are disposed at an angle of about 45 degrees with respect to the first and second outputs of the respective first and second laser emitter bars.
6. The system of claim 5 wherein the first output is laterally displaced by refraction through the thickness of the plate.
7. The system of claim 1 wherein the periodic interleaver comprises a pair of prisms wherein the periodic interleaver is formed on a surface of at least one of the prisms.