Widely Tunable Watt Level Single Frequency Tm Doped Fiber Ring Laser as Pump for Mid IR Frequency Generation
We demonstrate a thulium doped fiber ring laser (TDFRL) integrated with an amplifier, which has a watt level single frequency output at 2 <inline formula> <tex math notation="LaTeX"\mu\text{m}/tex math>/inline formula> with a 120 nm wavelength tunability. The TDFRL is constructed based on a hybrid ring linear resonator configuration. An unpumped TDF is incorporated as a self constructed saturable absorption grating. A blazed grating aligned in a Littrow configuration is employed for broadband wavelength selective feedback. The characteristics of the laser output mode are analyzed by using an all fiber scanning ring resonator.
IEEE Photonics Journal