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Erbium fiber laser
· Basics of fiber laser assembly.
· Optical pumping.
· Doped optical fiber.
· Resonator based on Bragg gratings.
· Linear and ring resonator.
· The spectral width of the line.
· Visualizer of laser radiation.
· Radiation detection.
Erbium fiber lasers operating in the spectral range safe for the eyes have found wide application in the processing of materials, in telecommunications, medicine, scientific instrumentation, and atmospheric monitoring. These lasers have a wide range of output power, high efficiency, high reliability. In this work, students will get acquainted with the basics of assembling a erbium fiber laser, study the physical principles of laser operation, determine the laser threshold, output power, and study the spectroscopic characteristics of a fiber laser. They will receive a pulsed laser operation by modulating the pump current and using passive modulation.
Components:
1) 980 nm Laser Diode Module, 1 pc.
2) Diode laser controller, 1 pc.
3) Aluminum Breadboard (300 mm x 450 mm x 12.7 mm, holes: M6),
1 pc.
4) Erbium-doped active optical fiber in a protective furcation tube, 1 m.
5) Fiber Optic Multiplexer 980/1550 nm, 1 pc.
6) Fiber-optic splitter 50/50, 1550 nm, 1 pc.
7) Fiber-optic splitter 30/70, 1550 nm, 1 pc.
8) Tray for fiber optic components, 2 pcs.

9) Optical connector FC / APC, 7 pcs.
10) Optical patch cable with FC / APC connectors, 1 pc.
11) Set for optical connector cleaning.
12) Laser beam visualizer IR2-1, 1 pc.
13) Photodetector with optical connector FC / APC, 5 GHz, 1 pc.
14) Manual, 1 pc.
15) Packing case with lodgement, 1 pc.

Optionally:
1) Power meter, 1 pc. (7Z01580 single-channel StarBright indicating device with cable, Ophir + 7Z02402 photodiode sensor complete with adapters)
2) SESAM (SAM-1550) semiconductor saturable absorber, which will allow to study the mode of passive mode locking of a fiber laser (mode-locked): the laser threshold of this mode, single and multipulse modes of operation, the length of the resonator in the frequency of generation, the types of spectra for resonators with normal, anomalous, and zero dispersion.

3) A fiber preserving polarization with a length of 0.3, 0.5, 0.7 and 1 m (PM1550). This will allow us to study the interference of waves in a fiber laser and to study the characteristics of interference (period and depth) depending on the length of the fiber preserving polarization and on the division coefficient of the droplet mirror.
4) Digital Oscilloscope, 100 MHz, 2 channels, 1 pc.
Note: for a complete study of the characteristics of the generated pulses in the mode of passive mode synchronization, a spectrum analyzer and an autocorrelator are required.