| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve a stable laser oscillation by extending a stable operational temperature range in which mode hopping does not occur. <P>SOLUTION: A laser oscillator is provided that comprises an optical circulator that emits light incident from a first port from a second port, emits the light incident from the second port from a third port and emits light incident from a fourth port from the first port; a first optical amplification fiber that amplifies light propagating therein by being excited by excitation light and makes the light emitted from the third port incident into the first port; a reflective optical filter that reflects light with a predetermined wavelength out of the light emitted from the second port to makes it incident again into the second port, while allowing light with the other wavelengths to pass through; and an excitation light source generating excitation light. The reflective optical filter allows the light laser-oscillated in a ring type resonator formed by the first optical amplification fiber, the optical circulator and the reflective optical filter to be passed through for output. The excitation light source allows excitation light to be incident from the fourth port into the ring type resonator. <P>COPYRIGHT: (C)2012,JPO&INPIT |
