High power continuous-wave dual-wavelength alexandrite laser

Abstract

A high power dual-wavelength alexandrite (Cr:BeAl 2 O 4 ) laser using a single plate birefringent filter (BRF) was demonstrated. Using a 6 mm thick BRF, dual-wavelength output at 745.2 nm and 756.2 nm (5.9 THz of frequency difference) with 850 mW of average output power was achieved as well as with 16.8% optical-to-optical and 24.2% slope efficiency. The tunability of dual-wavelength separation was also demonstrated by employing the 4 mm and 2 mm thick BRFs with similar output powers. To the best of our knowledge, this is the first demonstration of a dual-wavelength alexandrite laser.

Diode-pumped Yb:CALGO laser with conical refraction output

“…At the Lloyd image plane a clear CR beam with two concentric rings separated by the Poggendorff dark ring was obtained which in the far-field became a spot known as Raman. Future experiments will focus on further power scaling including the use of popular Nd-ion laser crystals [67][68][69][70] as well as continuous or discrete wavelength tunability [71][72][73][74][75] of the produced CR radiation.…”

Continuous-wave dual-wavelength operation of a diode-pumped Nd:GdVO4 laser at the 1063 & 1071 nm, 1063 & 1083 nm and 1083 &1086 nm wavelength pairs

“…Therefore, the controllable wavelength-dependent loss of a BRF can be used to modify the gain of a laser crystal and produce a dual-wavelength operation. Previously, BRFs were used for demonstration of dual-wavelength Yb-ion [45,46] and Alexandrite [47] lasers that are well-known for their broad gain bandwidths [48][49][50] and ability to generate ultrashort pulses [51][52][53][54][55][56]. In this work, a 2 mm thick quartz BRF plate was used.…”

Conical refraction Nd:CALGO laser with dual-wavelength output

“…Some applications, however, would benefit from multiple wavelengths. Multi-wavelength operation was demonstrated from a number of gain media [20][21][22][23][24][25].…”