Laser module
AssigneeFurukawa Electric Co., Ltd.
InventorsHideyuki Nasu, Takehiko Nomura, Tatsuhiko Ueki, Mamoru Shimada, Yuji Hiratani
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Abstract
An optical filter is provided on a first thermo-module whose temperature is controlled to be constant, via a base. Accordingly, a wavelength discrimination characteristic of the optical filter and an optical isolator can be stabilized, thereby realizing more accurate wavelength locking. Further, a second thermo-module is provided on the first thermo-module whose temperature is controlled to be constant. Accordingly, the temperature control range of the second thermo-module can be expanded, and hence the wavelength variable range of a semiconductor laser device provided on the second thermo-module via a base and a submount can be expanded.
Claims47
A laser module comprising:
- a first controllable temperature adjuster;
- a second controllable temperature adjuster provided on the first controllable temperature adjuster and having an element with an active temperature controlling function;
- a semiconductor laser device provided on the second controllable temperature adjuster;
- and
- a wavelength monitoring section that is provided on the first controllable temperature adjuster, and detects a change in wavelength of a laser beam output from the semiconductor laser device.
A laser module comprising:
- a first controllable temperature adjuster;
- a second controllable temperature adjuster provided on the first controllable temperature adjuster, said second controllable temperature adjuster including a heater and having an element with an active temperature controlling function;
- a semiconductor laser device provided on the second controllable temperature adjuster, and
- a wavelength monitoring section that is provided on the first controllable temperature adjuster, and detects a change in wavelength of a laser beam output from the semiconductor laser device.
A laser module comprising:
- a first controllable temperature adjuster;
- a second controllable temperature adjuster provided on the first controllable temperature adjuster and having an element with an active temperature controlling function;
- a third controllable temperature adjuster arranged side by side in isolation from the first controllable temperature adjuster;
- a semiconductor laser device provided on the second controllable temperature adjuster;
- and
- a wavelength monitoring section that is provided on the third controllable temperature adjuster, and detects a change in wavelength of a laser beam output from the semiconductor laser device.
A laser module comprising:
- a first controllable temperature adjuster;
- a thermal conductor having high thermal conductivity, which is provided on the first controllable temperature adjuster;
- a second controllable temperature adjuster provided on the thermal conductor and having an element with an active temperature controlling function;
- and
- a semiconductor laser device provided on the second controllable temperature adjuster.
Dependencies are inferred from the claim text.